Adding code coverage check to UT ci job

.github/workflows/unit-test.yml

@@ -32,3 +32,7 @@ jobs:
           scripts/unit_test.sh
         env:
           CGO_CFLAGS: "-O -D__BLST_PORTABLE__" # Set the CGO flags to use the portable version of BLST
+
+      - name: Check Code Coverage
+        run: |
+          scripts/check_coverage_unit_test.sh

scripts/check_coverage_unit_test.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+
+# file name of code coverage report and it has to exist.
+COVER_FILE=coverage.out
+if [ ! -f $COVER_FILE ]; then
+    echo "$COVER_FILE not found! Please run scripts/unit_test.sh first."
+    exit 1
+fi
+
+# percentage threshold of code coverage required
+COVERAGE_THRESHOLD=5.0
+
+# print current test coverage from report
+current_test_coverage=$(go tool cover -func=$COVER_FILE  | grep -e "total" | awk '{print $3}')
+echo "Current test coverage is $current_test_coverage"
+
+go tool cover -func=$COVER_FILE  | grep -e "total" | \
+awk -v coverageThreshold=$COVERAGE_THRESHOLD '{if (($3 - 0.0) < coverageThreshold) \
+  {print "Coverage is less than", coverageThreshold, "%. Checking Failed"; exit 1} \
+  else \
+  {print "Coverage is greater than or equal to", coverageThreshold, "%. Checking Passed."; exit 0}}'