test_runner: reporterColorMap changed to map functions

Author: mihir254

lib/internal/test_runner/reporter/utils.js

@@ -28,9 +28,15 @@ const reporterUnicodeSymbolMap = {
 
 const reporterColorMap = {
   '__proto__': null,
-  'test:fail': colors.red,
-  'test:pass': colors.green,
-  'test:diagnostic': colors.blue,
+  get 'test:fail'() {
+    return colors.red;
+  },
+  get 'test:pass'() {
+    return colors.green;
+  },
+  get 'test:diagnostic'() {
+    return colors.blue;
+  },
 };
 
 function indent(nesting) {