Update tests.

Keep watching a workflow with modularity-testing-framework will be stable.

Dockerfile

@@ -1,28 +1,16 @@
-FROM registry.fedoraproject.org/fedora:26
+# A workflow with docker is still uncertain.
+# Keep watching below file and other module's situation.
+# https://github.com/container-images/container-image-template/blob/master/Dockerfile.template
+FROM registry.fedoraproject.org/f26-modular/boltron
 
-# ruby image for OpenShift.
-#
-# Environment:
+WORKDIR /build
+COPY . .
 
-ENV NAME=ruby ARCH=x86_64
-LABEL MAINTAINER "Jun Aruga" <jaruga@redhat.com>
-LABEL summary="An interpreter of object-oriented scripting language" \
-    name="$FGC/$NAME" \
-    version="0" \
-    release="1.$DISTTAG" \
-    architecture="$ARCH" \
-    com.redhat.component=$NAME \
-    usage="docker run f26/ruby" \
-    help="Runs ruby. No dependencies. See Help File below for more details." \
-    description="An interpreter of object-oriented scripting language" \
-    io.k8s.description="An interpreter of object-oriented scripting language" \
-    io.k8s.diplay-name="Ruby 2.4 " \
-    io.openshift.tags="ruby"
+ENV LC_CTYPE C.UTF-8
 
-RUN dnf install -y --setopt=tsflags=nodocs ruby && \
-    dnf -y clean all
-
-# ruby will be run under standard user on Fedora
-USER 1000
+RUN dnf -y update
+RUN dnf -y --nodocs install \
+  ruby \
+  && dnf -y clean all
 
 CMD /bin/bash