Merge pull request #9861 from 9999years/colored-diff-in-lang-tests

Color `diff` output in `tests/functional/lang` tests

(cherry picked from commit 1dc55c0f2f034bce6e3de4a5cda96d686b10a7f8)
Change-Id: Ie9b3fc3446bd3caa0fd8885de88639516a2ff862

tests/functional/lang/framework.sh

@@ -16,7 +16,7 @@ function diffAndAcceptInner() {
     fi
 
     # Diff so we get a nice message
-    if ! diff --unified "$got" "$expectedOrEmpty"; then
+    if ! diff --color=always --unified "$expectedOrEmpty" "$got"; then
         echo "FAIL: evaluation result of $testName not as expected"
         badDiff=1
     fi