diff --git a/tests/lang_coverage/test.sh b/tests/lang_coverage/test.sh
index 447b935..da82202 100755
--- a/tests/lang_coverage/test.sh
+++ b/tests/lang_coverage/test.sh
@@ -12,19 +12,18 @@ VARLIST=${VARLIST:-}
 function get_font_path {
     local pkg=$1
 
-    rpm -ql $pkg|grep /usr/share/fonts/
+    rpm -ql "$pkg" | grep /usr/share/fonts/
 }
 
 function check_exception {
     local exregex=$1
     local file=$2
 
-    if [ "x$exregex" == "x" ]; then
-        echo -n 1
-    else
-        echo $file | grep -E "$exregex" 2>&1 > /dev/null
-        echo -n $?
+    if [ "$exregex" == "" ]; then
+        return 1
     fi
+    echo "$file" | grep -E "$exregex" > /dev/null 2>&1
+    return $?
 }
 
 function test_pkg {
@@ -32,7 +31,7 @@ function test_pkg {
 
     rlPhaseStartTest "Package installation test for $pkg"
     {
-        rlAssertRpm $pkg
+        rlAssertRpm "$pkg"
     }
     rlPhaseEnd
 }
@@ -42,19 +41,19 @@ function test_lang_coverage {
     local fclang=${2:-"en"}
     local fcexpat=${3:-}
 
-    test_pkg $pkg
+    test_pkg "$pkg"
 
     rlPhaseStartTest "Language coverage test for $pkg"
     {
-        for f in $(get_font_path $pkg); do
-            if echo $f|grep -Eq "\.(t1|ttf|otf|ttc|otc|pcf.*|pfa)$"; then
+        for f in $(get_font_path "$pkg"); do
+            if echo "$f"|grep -Eq "\.(t1|ttf|otf|ttc|otc|pcf.*|pfa)$"; then
                 set -f
                 if [ "$fclang" == "-" ]; then
                     rlLogInfo "Skipping $f (no language provided)"
-                elif [ $(check_exception $fcexpat $f) -ne 0 ] && [ -f $f ]; then
+                elif ! check_exception "$fcexpat" "$f" && [ -f "$f" ]; then
                     IFS=, read -ra langlist <<< "$fclang"
                     for l in "${langlist[@]}"; do
-                        rlRun "fc-validate -l $l $f" 0 "$pkg:$(basename $f): Check language coverage for $l"
+                        rlRun "fc-validate -l $l $f" 0 "$pkg:$(basename "$f"): Check language coverage for $l"
                     done
                 else
                     rlLogInfo "Skipping $f (according to FONT_LANG_EXCLUDE_FILES)"
@@ -73,6 +72,7 @@ rlJournalStart
     rlPhaseStartSetup
     {
         rlRun "tmp=\$(mktemp -d)" 0 "Create tmp directory"
+        # shellcheck disable=SC2154
         rlRun "pushd $tmp"
         rlRun "set -o pipefail"
     }
@@ -80,8 +80,8 @@ rlJournalStart
 
     if [ -n "$VARLIST" ] && [ -f "$TMT_TREE/plans/$VARLIST" ]; then
         rlLogInfo "Reading variables from $VARLIST"
-        cat "$TMT_TREE/plans/$VARLIST" | grep -E -v "^#" | while IFS=";" read -r PACKAGE FONT_ALIAS FONT_LANG FONT_WIDTH FONT_FAMILY SANS SERIF MONO EMOJI MATH FONT_LANG_EXCLUDE_FILES dummy; do
-            test_lang_coverage "$PACKAGE" "$FONT_LANG" "$FONT_LANG_EXCLUDE_FILES"
+        grep -E -v "^#" "$TMT_TREE/plans/$VARLIST" | while IFS=";" read -r _PACKAGE FONT_ALIAS _FONT_LANG FONT_WIDTH FONT_FAMILY SANS SERIF MONO EMOJI MATH _FONT_LANG_EXCLUDE_FILES dummy; do
+            test_lang_coverage "$_PACKAGE" "$_FONT_LANG" "$_FONT_LANG_EXCLUDE_FILES"
         done
     else
         test_lang_coverage "$PACKAGE" "$FONT_LANG" "$FONT_LANG_EXCLUDE_FILES"