test: migrate common.js tests to tap

test/node/common-do-nothing.js

@@ -0,0 +1,7 @@
+'use strict';
+
+const test = require('tap');
+
+const common = require('../../lib/common');
+
+test.equal(common.doNothing(), undefined, 'must not return a value');

test/node/common-forward-event.js

@@ -0,0 +1,59 @@
+'use strict';
+
+const test = require('tap').test;
+
+const events = require('events');
+
+const common = require('../../lib/common');
+
+test('must forward a single event', (test) => {
+  test.plan(1);
+
+  const sourceEventEmitter = new events.EventEmitter();
+  const targetEventEmitter = new events.EventEmitter();
+
+  common.forwardEvent(sourceEventEmitter, targetEventEmitter, 'testEvent');
+  targetEventEmitter.on('testEvent', () => {
+    test.pass('event handler must be called');
+  });
+
+  sourceEventEmitter.emit('testEvent');
+});
+
+test('must forward a single event under a new name', (test) => {
+  test.plan(1);
+
+  const sourceEventEmitter = new events.EventEmitter();
+  const targetEventEmitter = new events.EventEmitter();
+
+  common.forwardEvent(sourceEventEmitter, targetEventEmitter,
+    'testEvent', 'renamedEvent');
+
+  targetEventEmitter.on('renamedEvent', () => {
+    test.pass('event handler must be called');
+  });
+
+  sourceEventEmitter.emit('testEvent');
+});
+
+test('must forward multiple events', (test) => {
+  test.plan(2);
+
+  const sourceEventEmitter = new events.EventEmitter();
+  const targetEventEmitter = new events.EventEmitter();
+
+  common.forwardMultipleEvents(sourceEventEmitter, targetEventEmitter, [
+    'event1',
+    'event2'
+  ]);
+
+  targetEventEmitter.on('event1', () => {
+    test.pass('first event handler must be called');
+  });
+  targetEventEmitter.on('event2', () => {
+    test.pass('second event handler must be called');
+  });
+
+  sourceEventEmitter.emit('event1');
+  sourceEventEmitter.emit('event2');
+});

test/node/common-safe-require.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const test = require('tap');
+
+const common = require('../../lib/common');
+
+const existingModule = 'fs';
+const nonExistingModule = '__non_existing_module__';
+
+test.ok(common.safeRequire(existingModule), 'must require existing module');
+
+test.equal(common.safeRequire(nonExistingModule), null,
+  'must return \'null\' if module doesn\'t exist');