TMP: Verify that test is executed

src/test/shell/bazel/bazel_coverage_cc_test_llvm.sh

@@ -157,22 +157,25 @@ end_of_record"
 function test_cc_test_llvm_coverage_produces_lcov_report_with_split_postprocessing() {
   local -r clang="/usr/bin/clang"
   if [[ ! -x ${clang} ]]; then
-    return
+    echo "clang not installed. Skipping test."
+    return 1
   fi
   local -r clang_version=$(clang --version | grep -o "clang version [0-9]*" | cut -d " " -f 3)
   if [ "$clang_version" -lt 9 ] || [ "$clang_version" -eq 10 ] || [ "$clang_version" -eq 11 ]; then
     # No lcov produced with <9.0, no branch coverage with 10.0 and 11.0.
-    echo "clang versions <9.0 as well as 10.0 and 11.0 are not supported." && return
+    echo "clang versions <9.0 as well as 10.0 and 11.0 are not supported." && return 1
   fi
 
   local -r llvm_profdata="/usr/bin/llvm-profdata"
   if [[ ! -x ${llvm_profdata} ]]; then
-    return
+    echo "llvm-profdata not installed. Skipping test."
+    return 1
   fi
 
   local -r llvm_cov="/usr/bin/llvm-cov"
   if [[ ! -x ${llvm_cov} ]]; then
-    return
+    echo "llvm-cov not installed. Skipping test."
+    return 1
   fi
 
   setup_a_cc_lib_and_t_cc_test