fix: improve test case handling in test_wamr.sh

Author: lum1n0us

tests/wamr-test-suites/test_wamr.sh

@@ -1187,17 +1187,17 @@ function trigger()
     done
 }
 
-# if collect code coverage, ignore -s, test all test cases.
-if [[ $TEST_CASE_ARR == "unit" ]];then
-    # unit test cases are designed with specific compilation flags
-    # and run under specific modes.
-    # There is no need to loop through all running modes in this script.
-    unit_test || (echo "TEST FAILED"; exit 1)
-    collect_coverage unit
-    echo "JUST SKIP UNIT TEST NOW"
-elif [[ $TEST_CASE_ARR == "spec" ]];then
+if [[ $TEST_CASE_ARR ]];then
+  if [[ $TEST_CASE_ARR == "unit" ]];then
+      # unit test cases are designed with specific compilation flags
+      # and run under specific modes.
+      # There is no need to loop through all running modes in this script.
+      unit_test || (echo "TEST FAILED"; exit 1)
+      collect_coverage unit
+  else
     # loop through all running modes
     trigger || (echo "TEST FAILED"; exit 1)
+  fi
 else
     # test all suite, ignore polybench and libsodium because of long time cost
     TEST_CASE_ARR=("spec" "malformed" "standalone")