add logging and unit tests (#117)

* add logging and unit tests

* fix logging msg spell for notification

tests/utils/getCmdLineArg.test.js

@@ -0,0 +1,28 @@
+const getCmdLineArg = require('../../js/utils/getCmdLineArg.js');
+
+describe('getCmdLineArg tests', function() {
+    it('should return no exact match', function() {
+        var result = getCmdLineArg([ 'hello.exe', '--arg1', '--arg2'], '--arg', true);
+        expect(result).toBe(null);
+    });
+
+    it('should return exact match only', function() {
+        var result = getCmdLineArg([ 'hello.exe', '--arg1', '--arg2'], '--arg2', true);
+        expect(result).toBe('--arg2');
+    });
+
+    it('should return starts with match', function() {
+        var result = getCmdLineArg([ 'hello.exe', '--hello=test', '--arg2'], '--hello=');
+        expect(result).toBe('--hello=test');
+    });
+
+    it('should return no match for starts with', function() {
+        var result = getCmdLineArg([ 'hello.exe', '--hello=test', '--arg2'], '--help=');
+        expect(result).toBe(null);
+    });
+
+    it('should return no match invalid argv given', function() {
+        var result = getCmdLineArg('invalid argv', '--help=');
+        expect(result).toBe(null);
+    });
+});