diff --git a/README.md b/README.md
index 9c40082..0e4a781 100644
--- a/README.md
+++ b/README.md
@@ -14,12 +14,12 @@ Note: while the examples in this README are calling `podman`, you can replace an
 Description
 -----------
 
-Python 3.7 available as container is a base platform for 
-building and running various Python 3.7 applications and frameworks. 
-Python is an easy to learn, powerful programming language. It has efficient high-level 
-data structures and a simple but effective approach to object-oriented programming. 
-Python's elegant syntax and dynamic typing, together with its interpreted nature, 
-make it an ideal language for scripting and rapid application development in many areas 
+Python 3.7 available as container is a base platform for
+building and running various Python 3.7 applications and frameworks.
+Python is an easy to learn, powerful programming language. It has efficient high-level
+data structures and a simple but effective approach to object-oriented programming.
+Python's elegant syntax and dynamic typing, together with its interpreted nature,
+make it an ideal language for scripting and rapid application development in many areas
 on most platforms.
 
 This container image includes an npm utility
@@ -123,10 +123,16 @@ file inside your source code repository.
 
 * **ENABLE_PIPENV**
 
-    Set this variable to use [Pipenv](https://github.com/kennethreitz/pipenv),
+    Set this variable to use [Pipenv](https://github.com/pypa/pipenv),
     the higher-level Python packaging tool, to manage dependencies of the application.
     This should be used only if your project contains properly formated Pipfile
     and Pipfile.lock.
+* **PIN_PIPENV_VERSION**
+
+    Set this variable together with `ENABLE_PIPENV` to use a specific version of Pipenv.
+    If not set, the latest stable version from PyPI is installed.
+    For example `PIN_PIPENV_VERSION=2018.11.26` installs `pipenv==2018.11.26`.
+
 * **ENABLE_MICROPIPENV**
 
     Set this variable to use [micropipenv](https://github.com/thoth-station/micropipenv),
@@ -145,9 +151,12 @@ file inside your source code repository.
 
 * **PIP_INDEX_URL**
 
-    Set this variable to use a custom index URL or mirror to download required packages
-    during build process. This only affects packages listed in requirements.txt.
-    Pipenv ignores this variable.
+    Set this variable to use a custom index URL or mirror to download required
+    packages during build process. This affects packages listed in
+    requirements.txt. It also affects the installation of pipenv and
+    micropipenv and the update of pip in the container, though if not found in
+    the custom index, the container will try to install/update them from
+    upstream PyPI afterwards.
 
 * **UPGRADE_PIP_TO_LATEST**
 
diff --git a/s2i/bin/assemble b/s2i/bin/assemble
index a42dd53..3aaf9cc 100755
--- a/s2i/bin/assemble
+++ b/s2i/bin/assemble
@@ -23,7 +23,15 @@ function install_tool() {
   echo "---> Installing $1 packaging tool ..."
   VENV_DIR=$HOME/.local/venvs/$1
   virtualenv_bin "$VENV_DIR"
-  $VENV_DIR/bin/pip --isolated install -U $1$2  # Combines package name with [extras] if [extras] is defined as $2
+  # First, try to install the tool without --isolated which means that if you
+  # have your own PyPI mirror, it will take it from there. If this try fails, try it
+  # again with --isolated which ignores external pip settings (env vars, config file)
+  # and installs the tool from PyPI (needs internet connetion).
+  # $1$2 combines package name with [extras] or version specifier if is defined as $2```
+  if ! $VENV_DIR/bin/pip install -U $1$2; then
+    echo "WARNING: Installation of $1 failed, trying again from official PyPI with pip --isolated install"
+    $VENV_DIR/bin/pip install --isolated -U $1$2  # Combines package name with [extras] or version specifier if is defined as $2```
+  fi
   mkdir -p $HOME/.local/bin
   ln -s $VENV_DIR/bin/$1 $HOME/.local/bin/$1
 }
@@ -50,15 +58,25 @@ fix-permissions /opt/app-root -P
 # * pip < 19.3 does not support manylinux2014 wheels. Only manylinux2014 wheels
 #   support platforms like ppc64le, aarch64 or armv7
 echo "---> Upgrading pip to version 19.3.1 ..."
-pip install -U "pip==19.3.1"
+if ! pip install -U "pip==19.3.1"; then
+  echo "WARNING: Installation of 'pip==19.3.1' failed, trying again from official PyPI with pip --isolated install"
+  pip install --isolated -U "pip==19.3.1"
+fi
 
 if [[ ! -z "$UPGRADE_PIP_TO_LATEST" ]]; then
   echo "---> Upgrading pip to latest version ..."
-  pip install -U pip setuptools wheel
+  if ! pip install -U pip setuptools wheel; then
+    echo "WARNING: Installation of the latest pip,setuptools and wheel failed, trying again from official PyPI with pip --isolated install"
+    pip install --isolated -U pip setuptools wheel
+  fi
 fi
 
 if [[ ! -z "$ENABLE_PIPENV" ]]; then
-  install_tool "pipenv" "==2018.11.26"
+  if [[ ! -z "$PIN_PIPENV_VERSION" ]]; then
+    # Add == as a prefix to pipenv version, if defined
+    PIN_PIPENV_VERSION="==$PIN_PIPENV_VERSION"
+  fi
+  install_tool "pipenv" "$PIN_PIPENV_VERSION"
   echo "---> Installing dependencies via pipenv ..."
   if [[ -f Pipfile ]]; then
     pipenv install --deploy
diff --git a/test/django-test-app/requirements.txt b/test/django-test-app/requirements.txt
index 1f45a73..30eb621 100644
--- a/test/django-test-app/requirements.txt
+++ b/test/django-test-app/requirements.txt
@@ -1 +1 @@
-Django==1.11.28
+Django==1.11.29
diff --git a/test/imagestreams/python-centos7.json b/test/imagestreams/python-centos7.json
new file mode 100644
index 0000000..bc129c0
--- /dev/null
+++ b/test/imagestreams/python-centos7.json
@@ -0,0 +1,73 @@
+{
+  "kind": "ImageStream",
+  "apiVersion": "v1",
+  "metadata": {
+    "name": "python",
+    "annotations": {
+      "openshift.io/display-name": "Python"
+    }
+  },
+  "spec": {
+    "tags": [
+      {
+        "name": "latest",
+        "annotations": {
+          "openshift.io/display-name": "Python (Latest)",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python applications on CentOS 7. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.6/README.md.\n\nWARNING: By selecting this tag, your application will automatically update to use the latest version of Python available on OpenShift, including major version updates.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "ImageStreamTag",
+          "name": "3.6"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "3.6",
+        "annotations": {
+          "openshift.io/display-name": "Python 3.6",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 3.6 applications on CentOS 7. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.6/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:3.6,python",
+          "version": "3.6",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "docker.io/centos/python-36-centos7:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "2.7",
+        "annotations": {
+          "openshift.io/display-name": "Python 2.7",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 2.7 applications on CentOS 7. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/2.7/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:2.7,python",
+          "version": "2.7",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "docker.io/centos/python-27-centos7:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      }
+    ]
+  }
+}
diff --git a/test/imagestreams/python-rhel7.json b/test/imagestreams/python-rhel7.json
new file mode 100644
index 0000000..7de8ec1
--- /dev/null
+++ b/test/imagestreams/python-rhel7.json
@@ -0,0 +1,93 @@
+{
+  "kind": "ImageStream",
+  "apiVersion": "v1",
+  "metadata": {
+    "name": "python",
+    "annotations": {
+      "openshift.io/display-name": "Python"
+    }
+  },
+  "spec": {
+    "tags": [
+      {
+        "name": "latest",
+        "annotations": {
+          "openshift.io/display-name": "Python (Latest)",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python applications on RHEL 7. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.8/README.md.\n\nWARNING: By selecting this tag, your application will automatically update to use the latest version of Python available on OpenShift, including major version updates.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "ImageStreamTag",
+          "name": "3.8"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "3.8",
+        "annotations": {
+          "openshift.io/display-name": "Python 3.8",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 3.8 applications on RHEL 7. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.8/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:3.8,python",
+          "version": "3.8",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "registry.redhat.io/rhscl/python-38-rhel7:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "3.6",
+        "annotations": {
+          "openshift.io/display-name": "Python 3.6",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 3.6 applications on RHEL 7. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.6/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:3.6,python",
+          "version": "3.6",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "registry.redhat.io/rhscl/python-36-rhel7:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "2.7",
+        "annotations": {
+          "openshift.io/display-name": "Python 2.7",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 2.7 applications on RHEL 7. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/2.7/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:2.7,python",
+          "version": "2.7",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "registry.redhat.io/rhscl/python-27-rhel7:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      }
+    ]
+  }
+}
diff --git a/test/imagestreams/python-ubi8.json b/test/imagestreams/python-ubi8.json
new file mode 100644
index 0000000..b075cda
--- /dev/null
+++ b/test/imagestreams/python-ubi8.json
@@ -0,0 +1,93 @@
+{
+  "kind": "ImageStream",
+  "apiVersion": "v1",
+  "metadata": {
+    "name": "python",
+    "annotations": {
+      "openshift.io/display-name": "Python"
+    }
+  },
+  "spec": {
+    "tags": [
+      {
+        "name": "latest",
+        "annotations": {
+          "openshift.io/display-name": "Python (Latest)",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python applications on UBI 8. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.8/README.md.\n\nWARNING: By selecting this tag, your application will automatically update to use the latest version of Python available on OpenShift, including major version updates.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "ImageStreamTag",
+          "name": "3.8"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "3.8",
+        "annotations": {
+          "openshift.io/display-name": "Python 3.8",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 3.8 applications on UBI 8. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.8/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:3.8,python",
+          "version": "3.8",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "registry.redhat.io/ubi8/python-38:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "3.6",
+        "annotations": {
+          "openshift.io/display-name": "Python 3.6",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 3.6 applications on UBI 8. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/3.6/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:3.6,python",
+          "version": "3.6",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "registry.redhat.io/ubi8/python-36:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      },
+      {
+        "name": "2.7",
+        "annotations": {
+          "openshift.io/display-name": "Python 2.7",
+          "openshift.io/provider-display-name": "Red Hat, Inc.",
+          "description": "Build and run Python 2.7 applications on UBI 8. For more information about using this builder image, including OpenShift considerations, see https://github.com/sclorg/s2i-python-container/blob/master/2.7/README.md.",
+          "iconClass": "icon-python",
+          "tags": "builder,python",
+          "supports":"python:2.7,python",
+          "version": "2.7",
+          "sampleRepo": "https://github.com/sclorg/django-ex.git"
+        },
+        "from": {
+          "kind": "DockerImage",
+          "name": "registry.redhat.io/ubi8/python-27:latest"
+        },
+        "referencePolicy": {
+          "type": "Local"
+        }
+      }
+    ]
+  }
+}
diff --git a/test/micropipenv-test-app/.s2i/environment b/test/micropipenv-test-app/.s2i/environment
index 2d40b15..29efed4 100644
--- a/test/micropipenv-test-app/.s2i/environment
+++ b/test/micropipenv-test-app/.s2i/environment
@@ -1,2 +1,5 @@
 ENABLE_MICROPIPENV=true
 DISABLE_SETUP_PY_PROCESSING=true
+# This tests second try to install micropipenv with --isolated
+# because the first one won't work with following setting
+PIP_INDEX_URL=https://example.com/
diff --git a/test/pin-pipenv-version-test-app/.s2i/environment b/test/pin-pipenv-version-test-app/.s2i/environment
new file mode 100644
index 0000000..6440a42
--- /dev/null
+++ b/test/pin-pipenv-version-test-app/.s2i/environment
@@ -0,0 +1,2 @@
+ENABLE_PIPENV=1
+PIN_PIPENV_VERSION=2018.11.26
diff --git a/test/pin-pipenv-version-test-app/app.sh b/test/pin-pipenv-version-test-app/app.sh
new file mode 100755
index 0000000..b6d71a0
--- /dev/null
+++ b/test/pin-pipenv-version-test-app/app.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+echo "Testing PIN_PIPENV_VERSION (set in .s2i/environment) ..."
+pipenv_version=`pipenv --version`
+expected="pipenv, version 2018.11.26"
+if [ "$pipenv_version" != "$expected" ]; then
+  echo "ERROR: pipenv version is different than expected."
+  echo "Expected: ${expected}"
+  echo "Actual: ${pipenv_version}"
+  exit 1
+fi
+
+# Test the uwsgi server
+exec uwsgi \
+    --http-socket :8080 \
+    --die-on-term \
+    --master \
+    --single-interpreter \
+    --enable-threads \
+    --threads=5 \
+    --thunder-lock \
+    --module wsgi
diff --git a/test/pin-pipenv-version-test-app/requirements.txt b/test/pin-pipenv-version-test-app/requirements.txt
new file mode 100644
index 0000000..66d4205
--- /dev/null
+++ b/test/pin-pipenv-version-test-app/requirements.txt
@@ -0,0 +1,2 @@
+uWSGI
+Flask
diff --git a/test/pin-pipenv-version-test-app/wsgi.py b/test/pin-pipenv-version-test-app/wsgi.py
new file mode 100644
index 0000000..96e1a61
--- /dev/null
+++ b/test/pin-pipenv-version-test-app/wsgi.py
@@ -0,0 +1,9 @@
+from flask import Flask
+application = Flask(__name__)
+
+@application.route('/')
+def hello():
+    return b'Hello World from uWSGI hosted WSGI application!'
+
+if __name__ == '__main__':
+    application.run()
diff --git a/test/run b/test/run
index 5b0efcb..d3829de 100755
--- a/test/run
+++ b/test/run
@@ -6,7 +6,7 @@
 # IMAGE_NAME specifies a name of the candidate image used for testing.
 # The image has to be available before this script is executed.
 #
-declare -a WEB_APPS=({standalone,setup,setup-requirements,django,numpy,app-home,npm-virtualenv-uwsgi,locale,mod-wsgi,pipenv,pipenv-and-micropipenv-should-fail,micropipenv,micropipenv-requirements}-test-app)
+declare -a WEB_APPS=({standalone,setup,setup-requirements,django,numpy,app-home,npm-virtualenv-uwsgi,locale,mod-wsgi,pipenv,pipenv-and-micropipenv-should-fail,pin-pipenv-version,micropipenv,micropipenv-requirements}-test-app)
 
 # TODO: Make command compatible for Mac users
 test_dir="$(readlink -zf $(dirname "${BASH_SOURCE[0]}"))"
@@ -86,7 +86,7 @@ check_result() {
   # positive test & non-zero exit status = ERROR
   # negative test & zero exit status = ERROR
   local result="$1"
-  local test=${2:-positive}  # if not defined, we expect possitive test type (zero exit code)
+  local type=${2:-positive}  # if not defined, we expect possitive test type (zero exit code)
   if [[ "$type" == "positive" && "$result" != "0" ]]; then
     info "TEST FAILED (${type}), EXPECTED:0 GOT:${result}"
     cleanup
@@ -102,13 +102,13 @@ wait_for_cid() {
   local max_attempts=10
   local sleep_time=1
   local attempt=1
-  local result=1
   info "Waiting for application container to start $CONTAINER_ARGS ..."
   while [ $attempt -le $max_attempts ]; do
-    [ -f $cid_file ] && [ -s $cid_file ] && break
+    [ -f $cid_file ] && [ -s $cid_file ] && return 0
     attempt=$(( $attempt + 1 ))
     sleep $sleep_time
   done
+  return 1
 }
 
 test_s2i_usage() {
@@ -172,6 +172,9 @@ test_application() {
 
   # Wait for the container to write it's CID file
   wait_for_cid
+  # Some test apps have tests in their startup code so we have to check
+  # that the container starts at all
+  check_result $?
 
   test_scl_usage "python --version" "Python $VERSION." "${cid_file}"
   check_result $?
diff --git a/test/run-openshift b/test/run-openshift
index 87ac440..4a09812 100755
--- a/test/run-openshift
+++ b/test/run-openshift
@@ -10,11 +10,15 @@ THISDIR=$(dirname ${BASH_SOURCE[0]})
 
 source "${THISDIR}/test-lib.sh"
 source "${THISDIR}/test-lib-openshift.sh"
+source "${THISDIR}/test-lib-python.sh"
 
-set -exo nounset
+set -eo nounset
 
-test -n "${IMAGE_NAME-}" || false 'make sure $IMAGE_NAME is defined'
-test -n "${VERSION-}" || false 'make sure $VERSION is defined'
+trap ct_os_cleanup EXIT SIGINT
+
+ct_os_check_compulsory_vars
+
+ct_os_enable_print_logs
 
 if [ -z "${EPHEMERAL_TEMPLATES:-}" ]; then
     EPHEMERAL_TEMPLATES="
@@ -36,3 +40,13 @@ for template in $EPHEMERAL_TEMPLATES; do
                             8080 http 200 "-p SOURCE_REPOSITORY_REF=master -p PYTHON_VERSION=${VERSION} -p POSTGRESQL_VERSION=9.6 -p NAME=python-testing" \
                             "centos/postgresql-96-centos7|postgresql:9.6"
 done
+
+# Check the imagestream
+test_python_imagestream
+
+OS_TESTSUITE_RESULT=0
+
+ct_os_cluster_down
+
+# vim: set tabstop=2:shiftwidth=2:expandtab:
+
diff --git a/test/test-lib-openshift.sh b/test/test-lib-openshift.sh
index 89fc1cf..b92e950 100644
--- a/test/test-lib-openshift.sh
+++ b/test/test-lib-openshift.sh
@@ -139,6 +139,17 @@ function ct_os_get_pod_status() {
                             | awk '{print $1}' | head -n 1
 }
 
+# ct_os_get_build_pod_status POD_PREFIX
+# --------------------
+# Returns status of the build pod specified by prefix [pod_prefix].
+# Arguments: pod_prefix - prefix or whole ID of the pod
+function ct_os_get_build_pod_status() {
+  local pod_prefix="${1}" ; shift
+  local query="custom-columns=NAME:.metadata.name,Ready:status.containerStatuses[0].state.terminated.reason"
+  oc get pods -o "$query" | grep -e "${pod_prefix}" | grep -E "\-build\s" \
+                          | sort -u | awk '{print $2}' | tail -n 1
+}
+
 # ct_os_get_pod_name POD_PREFIX
 # --------------------
 # Returns the full name of pods specified by prefix [pod_prefix].
@@ -177,6 +188,18 @@ function ct_os_check_pod_readiness() {
 function ct_os_wait_pod_ready() {
   local pod_prefix="${1}" ; shift
   local timeout="${1}" ; shift
+  # If there is a build pod - wait for it to finish first
+  sleep 3
+  if ct_os_get_all_pods_name | grep -E "${pod_prefix}.*-build"; then
+    SECONDS=0
+    echo -n "Waiting for ${pod_prefix} build pod to finish ..."
+    while ! [ "$(ct_os_get_build_pod_status "${pod_prefix}")" == "Completed" ] ; do
+      echo -n "."
+      [ "${SECONDS}" -gt "${timeout}0" ] && echo " FAIL" && return 1
+      sleep 3
+    done
+    echo " DONE"
+  fi
   SECONDS=0
   echo -n "Waiting for ${pod_prefix} pod becoming ready ..."
   while ! ct_os_check_pod_readiness "${pod_prefix}" "true" ; do
@@ -231,7 +254,7 @@ function ct_os_deploy_s2i_image() {
   local image="${1}" ; shift
   local app="${1}" ; shift
   # ignore error exit code, because oc new-app returns error when image exists
-  oc new-app "${image}~${app}" "$@" || :
+  oc new-app "${image}~${app}" --strategy=source "$@" || :
 
   # let openshift cluster to sync to avoid some race condition errors
   sleep 3
@@ -580,10 +603,10 @@ function ct_os_test_s2i_app_func() {
   local context_dir=${3}
   local check_command=${4}
   local oc_args=${5:-}
-  local import_image=${6:-}
   local image_name_no_namespace=${image_name##*/}
   local service_name="${image_name_no_namespace}-testing"
   local image_tagged="${image_name_no_namespace}:${VERSION}"
+  local namespace
 
   if [ $# -lt 4 ] || [ -z "${1}" ] || [ -z "${2}" ] || [ -z "${3}" ] || [ -z "${4}" ]; then
     echo "ERROR: ct_os_test_s2i_app_func() requires at least 4 arguments that cannot be emtpy." >&2
@@ -592,18 +615,19 @@ function ct_os_test_s2i_app_func() {
 
   # shellcheck disable=SC2119
   ct_os_new_project
+
+  namespace=${CT_NAMESPACE:-"$(oc project -q)"}
+
   # Create a specific imagestream tag for the image so that oc cannot use anything else
   if [ "${CT_SKIP_UPLOAD_IMAGE:-false}" == 'true' ] ; then
-    if [ -n "${import_image}" ] ; then
-      echo "Importing image ${import_image} as ${image_name}:${VERSION}"
-      # Use --reference-policy=local to pull remote image content to the cluster
-      # Works around the issue of builder pods not having access to registry.redhat.io
-      oc import-image "${image_name}":"${VERSION}" --from "${import_image}" --confirm --reference-policy=local
-    else
-      echo "Uploading and importing image skipped."
-    fi
+    echo "Importing image ${image_name} as ${namespace}/${image_tagged}"
+    # Use --reference-policy=local to pull remote image content to the cluster
+    # Works around the issue of builder pods not having access to registry.redhat.io
+    oc tag --source=docker "${image_name}" "${namespace}/${image_tagged}" --insecure=true --reference-policy=local
+    ct_os_wait_stream_ready "${image_tagged}" "${namespace}"
   else
-    ct_os_upload_image "${import_image:-$image_name}" "${image_tagged}"
+    echo "Uploading image ${image_name} as ${image_tagged}"
+    ct_os_upload_image "${image_name}" "${image_tagged}"
   fi
 
   local app_param="${app}"
@@ -630,15 +654,21 @@ function ct_os_test_s2i_app_func() {
 
   local ip
   local check_command_exp
+  local image_id
+
+  # get image ID from the deployment config
+  image_id=$(oc get "deploymentconfig.apps.openshift.io/${service_name}" -o custom-columns=IMAGE:.spec.template.spec.containers[*].image | tail -n 1)
 
   ip=$(ct_os_get_service_ip "${service_name}")
   # shellcheck disable=SC2001
-  check_command_exp=$(echo "$check_command" | sed -e "s/<IP>/$ip/g")
+  check_command_exp=$(echo "$check_command" | sed -e "s/<IP>/$ip/g" -e "s|<SAME_IMAGE>|${image_id}|g")
 
   echo "  Checking APP using $check_command_exp ..."
   local result=0
   eval "$check_command_exp" || result=1
 
+  ct_os_service_image_info "${service_name}"
+
   if [ $result -eq 0 ] ; then
     echo "  Check passed."
   else
@@ -672,7 +702,6 @@ function ct_os_test_s2i_app() {
   local protocol=${6:-http}
   local response_code=${7:-200}
   local oc_args=${8:-}
-  local import_image=${9:-}
 
   if [ $# -lt 4 ] || [ -z "${1}" ] || [ -z "${2}" ] || [ -z "${3}" ] || [ -z "${4}" ]; then
     echo "ERROR: ct_os_test_s2i_app() requires at least 4 arguments that cannot be emtpy." >&2
@@ -683,7 +712,7 @@ function ct_os_test_s2i_app() {
                           "${app}" \
                           "${context_dir}" \
                           "ct_os_test_response_internal '${protocol}://<IP>:${port}' '${response_code}' '${expected_output}'" \
-                          "${oc_args}" "${import_image}"
+                          "${oc_args}"
 }
 
 # ct_os_test_template_app_func IMAGE APP IMAGE_IN_TEMPLATE CHECK_CMD [OC_ARGS]
@@ -709,7 +738,6 @@ function ct_os_test_template_app_func() {
   local check_command=${4}
   local oc_args=${5:-}
   local other_images=${6:-}
-  local import_image=${7:-}
 
   if [ $# -lt 4 ] || [ -z "${1}" ] || [ -z "${2}" ] || [ -z "${3}" ] || [ -z "${4}" ]; then
     echo "ERROR: ct_os_test_template_app_func() requires at least 4 arguments that cannot be emtpy." >&2
@@ -718,22 +746,23 @@ function ct_os_test_template_app_func() {
 
   local service_name="${name_in_template}-testing"
   local image_tagged="${name_in_template}:${VERSION}"
+  local namespace
 
   # shellcheck disable=SC2119
   ct_os_new_project
 
+  namespace=${CT_NAMESPACE:-"$(oc project -q)"}
+
   # Create a specific imagestream tag for the image so that oc cannot use anything else
   if [ "${CT_SKIP_UPLOAD_IMAGE:-false}" == 'true' ] ; then
-    if [ -n "${import_image}" ] ; then
-      echo "Importing image ${import_image} as ${image_name}:${VERSION}"
-      # Use --reference-policy=local to pull remote image content to the cluster
-      # Works around the issue of builder pods not having access to registry.redhat.io
-      oc import-image "${image_name}":"${VERSION}" --from "${import_image}" --confirm --reference-policy=local
-    else
-      echo "Uploading and importing image skipped."
-    fi
+    echo "Importing image ${image_name} as ${image_tagged}"
+    # Use --reference-policy=local to pull remote image content to the cluster
+    # Works around the issue of builder pods not having access to registry.redhat.io
+    oc tag --source=docker "${image_name}" "${namespace}/${image_tagged}" --insecure=true --reference-policy=local
+    ct_os_wait_stream_ready "${image_tagged}" "${namespace}"
   else
-    ct_os_upload_image "${import_image:-$image_name}" "${image_tagged}"
+    echo "Uploading image ${image_name} as ${image_tagged}"
+    ct_os_upload_image "${image_name}" "${image_tagged}"
 
     # upload also other images, that template might need (list of pairs in the format <image>|<tag>
     local image_tag_a
@@ -750,9 +779,6 @@ function ct_os_test_template_app_func() {
   # considered an internal template name, like 'mysql', so use the name
   # explicitly
   local local_template
-  local namespace
-  
-  namespace=${CT_NAMESPACE:-$(oc project -q)}
 
   local_template=$(ct_obtain_input "${template}" 2>/dev/null || echo "--template=${template}")
   # shellcheck disable=SC2086
@@ -765,15 +791,21 @@ function ct_os_test_template_app_func() {
 
   local ip
   local check_command_exp
+  local image_id
+
+  # get image ID from the deployment config
+  image_id=$(oc get "deploymentconfig.apps.openshift.io/${service_name}" -o custom-columns=IMAGE:.spec.template.spec.containers[*].image | tail -n 1)
 
   ip=$(ct_os_get_service_ip "${service_name}")
   # shellcheck disable=SC2001
-  check_command_exp=$(echo "$check_command" | sed -e "s/<IP>/$ip/g")
+  check_command_exp=$(echo "$check_command" | sed -e "s/<IP>/$ip/g" -e "s|<SAME_IMAGE>|${image_id}|g")
 
   echo "  Checking APP using $check_command_exp ..."
   local result=0
   eval "$check_command_exp" || result=1
 
+  ct_os_service_image_info "${service_name}"
+
   if [ $result -eq 0 ] ; then
     echo "  Check passed."
   else
@@ -813,7 +845,6 @@ function ct_os_test_template_app() {
   local response_code=${7:-200}
   local oc_args=${8:-}
   local other_images=${9:-}
-  local import_image=${10:-}
 
   if [ $# -lt 4 ] || [ -z "${1}" ] || [ -z "${2}" ] || [ -z "${3}" ] || [ -z "${4}" ]; then
     echo "ERROR: ct_os_test_template_app() requires at least 4 arguments that cannot be emtpy." >&2
@@ -825,8 +856,7 @@ function ct_os_test_template_app() {
                                "${name_in_template}" \
                                "ct_os_test_response_internal '${protocol}://<IP>:${port}' '${response_code}' '${expected_output}'" \
                                "${oc_args}" \
-                               "${other_images}" \
-                               "${import_image}"
+                               "${other_images}"
 }
 
 # ct_os_test_image_update IMAGE_NAME OLD_IMAGE ISTAG CHECK_FUNCTION OC_ARGS
@@ -1017,7 +1047,7 @@ function ct_os_check_cmd_internal() {
   # shellcheck disable=SC2001
   check_command_exp=$(echo "$check_command" | sed -e "s/<IP>/$ip/g")
 
-  ct_os_deploy_cmd_image "$(ct_os_get_image_from_pod "${util_image_name##*/}" | head -n 1)"
+  ct_os_deploy_cmd_image "${util_image_name}"
   SECONDS=0
 
   echo -n "Waiting for ${service_name} service becoming ready ..."
@@ -1037,4 +1067,200 @@ function ct_os_check_cmd_internal() {
   return 1
 }
 
+# ct_os_test_image_stream_template IMAGE_STREAM_FILE TEMPLATE_FILE SERVICE NAME [TEMPLATE_PARAMS]
+# ------------------------
+# Creates an image stream and deploys a specified template. Then checks that a pod runs.
+# Argument: image_stream_file - local or remote file with the image stream definition
+# Argument: template_file - local file name with a template
+# Argument: service_name - how the pod will be named (prefix)
+# Argument: template_params (optional) - parameters for the template, like image stream version
+function ct_os_test_image_stream_template() {
+  local image_stream_file=${1}
+  local template_file=${2}
+  local service_name=${3}
+  local template_params=${4:-}
+  local local_image_stream_file
+  local local_template_file
+
+  if [ $# -lt 3 ] || [ -z "${1}" ] || [ -z "${2}" ] || [ -z "${3}" ]; then
+    echo "ERROR: ct_os_test_image_stream() requires at least 3 arguments that cannot be empty." >&2
+    return 1
+  fi
+
+  echo "Running image stream test for stream ${image_stream_file} and template ${template_file}"
+  # shellcheck disable=SC2119
+  ct_os_new_project
+
+  local_image_stream_file=$(ct_obtain_input "${image_stream_file}")
+  local_template_file=$(ct_obtain_input "${template_file}")
+  oc create -f "${local_image_stream_file}"
+
+  # shellcheck disable=SC2086
+  if ! ct_os_deploy_template_image "${local_template_file}" -p NAMESPACE="${CT_NAMESPACE:-$(oc project -q)}" ${template_params} ; then
+    echo "ERROR: ${template_file} could not be loaded"
+    return 1
+    # Deliberately not runnig ct_os_delete_project here because user either
+    # might want to investigate or the cleanup is done with the cleanup trap.
+    # Most functions depend on the set -e anyway at this point.
+  fi
+  ct_os_wait_pod_ready "${service_name}" 120
+
+  # shellcheck disable=SC2119
+  ct_os_delete_project
+}
+
+# ct_os_wait_stream_ready IMAGE_STREAM_FILE NAMESPACE [ TIMEOUT ]
+# ------------------------
+# Waits max timeout seconds till a [stream] is available in the [namespace].
+# Arguments: image_stream - stream name (usuallly <image>:<version>)
+# Arguments: namespace - namespace name
+# Arguments: timeout - how many seconds to wait
+function ct_os_wait_stream_ready() {
+  local image_stream=${1}
+  local namespace=${2}
+  local timeout=${3:-60}
+  # It takes some time for the first time before the image is pulled in
+  SECONDS=0
+  echo -n "Waiting for ${namespace}/${image_stream} to become available ..."
+  while ! oc get -n "${namespace}" istag "${image_stream}" &>/dev/null; do
+    if [ "$SECONDS" -gt "${timeout}" ] ; then
+      echo "FAIL: ${namespace}/${image_stream} not available after ${timeout}s:"
+      echo "oc get -n ${namespace} istag ${image_stream}"
+      oc get -n "${namespace}" istag "${image_stream}"
+      return 1
+    fi
+    sleep 3
+    echo -n .
+  done
+  echo " DONE"
+}
+
+# ct_os_test_image_stream_s2i IMAGE_STREAM_FILE IMAGE_NAME APP CONTEXT_DIR EXPECTED_OUTPUT [PORT, PROTOCOL, RESPONSE_CODE, OC_ARGS, ... ]
+# --------------------
+# Check the imagestream with an s2i app check. First it imports the given image stream, then
+# it runs [image] and [app] in the openshift and optionally specifies env_params
+# as environment variables to the image. Then check the http response.
+# Argument: image_stream_file - local or remote file with the image stream definition
+# Argument: image_name - container image we test (or name of the existing image stream in <name>:<version> format)
+# Argument: app - url or local path to git repo with the application sources (compulsory)
+# Argument: context_dir - sub-directory inside the repository with the application sources (compulsory)
+# Argument: expected_output - PCRE regular expression that must match the response body (compulsory)
+# Argument: port - which port to use (optional; default: 8080)
+# Argument: protocol - which protocol to use (optional; default: http)
+# Argument: response_code - what http response code to expect (optional; default: 200)
+# Argument: oc_args - all other arguments are used as additional parameters for the `oc new-app`
+#            command, typically environment variables (optional)
+function ct_os_test_image_stream_s2i() {
+  local image_stream_file=${1}
+  local image_name=${2}
+  local app=${3}
+  local context_dir=${4}
+  local expected_output=${5}
+  local port=${6:-8080}
+  local protocol=${7:-http}
+  local response_code=${8:-200}
+  local oc_args=${9:-}
+  local result
+  local local_image_stream_file
+
+  echo "Running image stream test for stream ${image_stream_file} and application ${app} with context ${context_dir}"
+
+  # shellcheck disable=SC2119
+  ct_os_new_project
+
+  local_image_stream_file=$(ct_obtain_input "${image_stream_file}")
+  oc create -f "${local_image_stream_file}"
+
+  # ct_os_test_s2i_app creates a new project, but we already need
+  # it before for the image stream import, so tell it to skip this time
+  CT_SKIP_NEW_PROJECT=true \
+  ct_os_test_s2i_app "${IMAGE_NAME}" "${app}" "${context_dir}" "${expected_output}" \
+                     "${port}" "${protocol}" "${response_code}" "${oc_args}"
+  result=$?
+
+  # shellcheck disable=SC2119
+  ct_os_delete_project
+
+  return $result
+}
+
+# ct_os_test_image_stream_quickstart IMAGE_STREAM_FILE TEMPLATE IMAGE_NAME NAME_IN_TEMPLATE EXPECTED_OUTPUT [PORT, PROTOCOL, RESPONSE_CODE, OC_ARGS, OTHER_IMAGES ]
+# --------------------
+# Check the imagestream with an s2i app check. First it imports the given image stream, then
+# it runs [image] and [app] in the openshift and optionally specifies env_params
+# as environment variables to the image. Then check the http response.
+# Argument: image_stream_file - local or remote file with the image stream definition
+# Argument: template_file - local file name with a template
+# Argument: image_name - container image we test (or name of the existing image stream in <name>:<version> format)
+# Argument: name_in_template - image name used in the template
+# Argument: expected_output - PCRE regular expression that must match the response body (compulsory)
+# Argument: port - which port to use (optional; default: 8080)
+# Argument: protocol - which protocol to use (optional; default: http)
+# Argument: response_code - what http response code to expect (optional; default: 200)
+# Argument: oc_args - all other arguments are used as additional parameters for the `oc new-app`
+#            command, typically environment variables (optional)
+# Argument: other_images - some templates need other image to be pushed into the OpenShift registry,
+#            specify them in this parameter as "<image>|<tag>", where "<image>" is a full image name
+#            (including registry if needed) and "<tag>" is a tag under which the image should be available
+#            in the OpenShift registry.
+function ct_os_test_image_stream_quickstart() {
+  local image_stream_file=${1}
+  local template_file=${2}
+  local image_name=${3}
+  local name_in_template=${4}
+  local expected_output=${5}
+  local port=${6:-8080}
+  local protocol=${7:-http}
+  local response_code=${8:-200}
+  local oc_args=${9:-}
+  local other_images=${10:-}
+  local result
+  local local_image_stream_file
+  local local_template_file
+
+  echo "Running image stream test for stream ${image_stream_file} and quickstart template ${template_file}"
+
+  # shellcheck disable=SC2119
+  ct_os_new_project
+
+  local_image_stream_file=$(ct_obtain_input "${image_stream_file}")
+  local_template_file=$(ct_obtain_input "${template_file}")
+  oc create -f "${local_image_stream_file}"
+
+  # ct_os_test_template_app creates a new project, but we already need
+  # it before for the image stream import, so tell it to skip this time
+  CT_SKIP_NEW_PROJECT=true \
+  ct_os_test_template_app "${image_name}" \
+                          "${local_template_file}" \
+                          "${name_in_template}" \
+                          "${expected_output}" \
+                          "${port}" "${protocol}" "${response_code}" "${oc_args}" "${other_images}"
+
+  result=$?
+
+  # shellcheck disable=SC2119
+  ct_os_delete_project
+
+  return $result
+}
+
+# ct_os_service_image_info SERVICE_NAME
+# --------------------
+# Shows information about the image used by a specified service.
+# Argument: service_name - Service name (uesd for deployment config)
+function ct_os_service_image_info() {
+  local service_name=$1
+  local image_id
+  local namespace
+
+  # get image ID from the deployment config
+  image_id=$(oc get "deploymentconfig.apps.openshift.io/${service_name}" -o custom-columns=IMAGE:.spec.template.spec.containers[*].image | tail -n 1)
+  namespace=${CT_NAMESPACE:-"$(oc project -q)"}
+
+  echo "  Information about the image we work with:"
+  oc get deploymentconfig.apps.openshift.io/"${service_name}" -o yaml | grep lastTriggeredImage
+  # for s2i builds, the resulting image is actually in the current namespace,
+  # so if the specified namespace does not succeed, try the current namespace
+  oc get isimage -n "${namespace}" "${image_id##*/}" -o yaml || oc get isimage "${image_id##*/}" -o yaml
+}
 # vim: set tabstop=2:shiftwidth=2:expandtab:
diff --git a/test/test-lib-python.sh b/test/test-lib-python.sh
new file mode 100644
index 0000000..c86056a
--- /dev/null
+++ b/test/test-lib-python.sh
@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+# Functions for tests for the Python image in OpenShift.
+#
+# IMAGE_NAME specifies a name of the candidate image used for testing.
+# The image has to be available before this script is executed.
+#
+
+THISDIR=$(dirname ${BASH_SOURCE[0]})
+
+source "${THISDIR}/test-lib.sh"
+source "${THISDIR}/test-lib-openshift.sh"
+
+# Check the imagestream
+function test_python_imagestream() {
+  case ${OS} in
+    rhel7|centos7) ;;
+    *) echo "Imagestream testing not supported for $OS environment." ; return 0 ;;
+  esac
+
+  ct_os_test_image_stream_quickstart "${THISDIR}/imagestreams/python-${OS}.json" \
+                                     'https://raw.githubusercontent.com/sclorg/django-ex/master/openshift/templates/django-postgresql.json' \
+                                     "${IMAGE_NAME}" \
+                                     'python' \
+                                     'Welcome to your Django application on OpenShift' \
+                                     8080 http 200 "-p SOURCE_REPOSITORY_REF=master -p PYTHON_VERSION=${VERSION} -p POSTGRESQL_VERSION=9.6 -p NAME=python-testing" \
+                                     "centos/postgresql-96-centos7|postgresql:9.6"
+}
+
+# vim: set tabstop=2:shiftwidth=2:expandtab:
+
diff --git a/test/test-lib.sh b/test/test-lib.sh
index b959c34..52bee15 100644
--- a/test/test-lib.sh
+++ b/test/test-lib.sh
@@ -50,6 +50,44 @@ function ct_enable_cleanup() {
   trap ct_cleanup EXIT SIGINT
 }
 
+# ct_check_envs_set env_filter check_envs loop_envs [env_format]
+# --------------------
+# Compares values from one list of environment variable definitions against such list,
+# checking if the values are present and have a specific format.
+# Argument: env_filter - optional string passed to grep used for
+#   choosing which variables to filter out in env var lists.
+# Argument: check_envs - list of env var definitions to check values against
+# Argument: loop_envs - list of env var definitions to check values for
+# Argument: env_format (optional) - format string for bash substring deletion used
+#   for checking whether the value is contained in check_envs.
+#   Defaults to: "*VALUE*", VALUE string gets replaced by actual value from loop_envs
+function ct_check_envs_set {
+  local env_filter check_envs env_format
+  env_filter=$1; shift
+  check_envs=$1; shift
+  loop_envs=$1; shift
+  env_format=${1:-"*VALUE*"}
+  while read -r variable; do
+    var_name=$(echo "$variable" | awk -F= '{ print $1 }')
+    stripped=$(echo "$variable" | awk -F= '{ print $2 }')
+    filtered_envs=$(echo "$check_envs" | grep "^$var_name=")
+    [ -z "$filtered_envs" ] && { echo "$var_name not found during \` docker exec\`"; return 1; }
+    old_IFS=$IFS
+    # For each such variable compare its content with the `docker exec` result, use `:` as delimiter
+    IFS=:
+    for value in $stripped; do
+        # If the falue checked does not go through env_filter we do not care about it
+        echo "$value" | grep -q "$env_filter" || continue
+        if [ -n "${filtered_envs##${env_format//VALUE/$value}}" ]; then
+            echo " Value $value is missing from variable $var_name"
+            echo "$filtered_envs"
+            return 1
+        fi
+    done
+  done <<< "$(echo "$loop_envs" | grep "$env_filter" | grep -v "^PWD=")"
+  IFS=$old_IFS
+}
+
 # ct_get_cid [name]
 # --------------------
 # Prints container id from cid_file based on the name of the file.
@@ -285,6 +323,91 @@ function ct_npm_works() {
   : "  Success!"
 }
 
+# ct_binary_found_from_df binary [path]
+# --------------------
+# Checks if a binary can be found in PATH during Dockerfile build
+# Argument: binary - name of the binary to test accessibility for
+# Argument: path - optional path in which the binary should reside in
+#                  /opt/rh by default
+function ct_binary_found_from_df() {
+  local tmpdir
+  local binary=$1; shift
+  local binary_path=${1:-"^/opt/rh"}
+  tmpdir=$(mktemp -d)
+  : "  Testing $binary in build from Dockerfile"
+
+  # Create Dockerfile that looks for the binary
+  cat <<EOF >"$tmpdir/Dockerfile"
+FROM $IMAGE_NAME
+RUN which $binary | grep "$binary_path"
+EOF
+  # Build an image, looking for expected path in the output
+  if ! docker build -f "$tmpdir/Dockerfile" --no-cache "$tmpdir"; then
+    echo "  ERROR: Failed to find $binary in Dockerfile!" >&2
+    return 1
+  fi
+  : "  Success!"
+}
+
+# ct_check_exec_env_vars [env_filter]
+# --------------------
+# Checks if all relevant environment variables from `docker run`
+# can be found in `docker exec` as well.
+# Argument: env_filter - optional string passed to grep used for
+#   choosing which variables to check in the test case.
+#   Defaults to X_SCLS and variables containing /opt/app-root, /opt/rh
+# Uses: $CID_FILE_DIR - path to directory containing cid_files
+# Uses: $IMAGE_NAME - name of the image being tested
+function ct_check_exec_env_vars() {
+  local tmpdir exec_envs cid old_IFS env_filter
+  local var_name stripped filtered_envs run_envs
+  env_filter=${1:-"^X_SCLS=\|/opt/rh\|/opt/app-root"}
+  tmpdir=$(mktemp -d)
+  CID_FILE_DIR=${CID_FILE_DIR:-$(mktemp -d)}
+  # Get environment variables from `docker run`
+  run_envs=$(docker run --rm "$IMAGE_NAME" /bin/bash -c "env")
+  # Get environment variables from `docker exec`
+  ct_create_container "test_exec_envs" bash -c "sleep 1000" >/dev/null
+  cid=$(ct_get_cid "test_exec_envs")
+  exec_envs=$(docker exec "$cid" env)
+  # Filter out variables we are not interested in
+  # Always check X_SCLS, ignore PWD
+  # Check variables from `docker run` that have alternative paths inside (/opt/rh, /opt/app-root)
+  ct_check_envs_set "$env_filter" "$exec_envs" "$run_envs" "*VALUE*" || return 1
+  echo " All values present in \`docker exec\`"
+  return 0
+}
+
+# ct_check_scl_enable_vars [env_filter]
+# --------------------
+# Checks if all relevant environment variables from `docker run`
+# are set twice after a second call of `scl enable $SCLS`.
+# Argument: env_filter - optional string passed to grep used for
+#   choosing which variables to check in the test case.
+#   Defaults to paths containing enabled SCLS in the image
+# Uses: $IMAGE_NAME - name of the image being tested
+function ct_check_scl_enable_vars() {
+  local tmpdir exec_envs cid old_IFS env_filter enabled_scls
+  local var_name stripped filtered_envs loop_envs
+  env_filter=$1
+  tmpdir=$(mktemp -d)
+  enabled_scls=$(docker run --rm "$IMAGE_NAME" /bin/bash -c "echo \$X_SCLS")
+  if [ -z "$env_filter" ]; then
+    for scl in $enabled_scls; do
+      [ -z "$env_filter" ] && env_filter="/$scl" && continue
+      # env_filter not empty, append to the existing list
+      env_filter="$env_filter|/$scl"
+    done
+  fi
+  # Get environment variables from `docker run`
+  loop_envs=$(docker run --rm "$IMAGE_NAME" /bin/bash -c "env")
+  run_envs=$(docker run  --rm "$IMAGE_NAME" /bin/bash -c "X_SCLS= scl enable $enabled_scls env")
+  # Check if the values are set twice in the second set of envs
+  ct_check_envs_set "$env_filter" "$run_envs" "$loop_envs" "*VALUE*VALUE*" || return 1
+  echo " All scl_enable values present"
+  return 0
+}
+
 # ct_path_append PATH_VARNAME DIRECTORY
 # -------------------------------------
 # Append DIRECTORY to VARIABLE of name PATH_VARNAME, the VARIABLE must consist