[Ubuntu] Migrate tests for common tools to Pester (part 1) (#2288)

* add common tools tests pt1

* fix tests

* fix erlang test

* resolve comments

* minor changes

* remove extra logging

images/linux/scripts/installers/clang.sh

@@ -6,6 +6,7 @@
 
 # Source the helpers for use with the script
 source $HELPER_SCRIPTS/os.sh
+source $HELPER_SCRIPTS/invoke-tests.sh
 
 function InstallClang {
     local version=$1
@@ -16,16 +17,7 @@ function InstallClang {
         apt-get install -y "clang-format-$version"
     else
         apt-get install -y "clang-$version" "lldb-$version" "lld-$version" "clang-format-$version"
-    fi
-
-    # Run tests to determine that the software installed as expected
-    echo "Testing to make sure that script performed as expected, and basic scenarios work"
-    for cmd in clang-$version clang++-$version; do
-        if ! command -v $cmd; then
-            echo "$cmd was not installed"
-            exit 1
-        fi
-    done
+    fi    
 }
 
 function SetDefaultClang {
@@ -41,15 +33,10 @@ function SetDefaultClang {
 wget https://apt.llvm.org/llvm.sh
 chmod +x llvm.sh
 
-if isUbuntu16 || isUbuntu18; then
-   versions=( "6.0" "8" "9" )
-   default_clang_version="9"
-fi
+toolset="$INSTALLER_SCRIPT_FOLDER/toolset.json"
 
-if isUbuntu20 ; then
-    versions=( "8" "9" "10" )
-    default_clang_version="10"
-fi
+versions=$(jq -r '.clang.versions[]' $toolset)
+default_clang_version=$(jq -r '.clang.default_version' $toolset)
 
 for version in ${versions[*]}; do
     InstallClang $version
@@ -57,3 +44,5 @@ done
 
 SetDefaultClang $default_clang_version
 rm llvm.sh
+
+invoke_tests "Tools" "clang"