v3: expose public interface for logger and add tests

test/api/v3/unit/libs/logger.js

@@ -0,0 +1,58 @@
+import winston from 'winston';
+
+/* eslint-disable global-require */
+describe('logger', () => {
+  let pathToLoggerLib = '../../../../../website/src/libs/api-v3/logger';
+  let infoSpy;
+  let errorSpy;
+
+  beforeEach(() => {
+    delete require.cache[require.resolve(pathToLoggerLib)];
+
+    infoSpy = sandbox.stub();
+    errorSpy = sandbox.stub();
+    sandbox.stub(winston, 'Logger').returns({
+      info: infoSpy,
+      error: errorSpy,
+    });
+  });
+
+  afterEach(() => {
+    sandbox.restore();
+  });
+
+  it('info', () => {
+    let attachLogger = require(pathToLoggerLib);
+    attachLogger.info(1, 2, 3);
+    expect(infoSpy).to.be.calledOnce;
+    expect(infoSpy).to.be.calledWith(1, 2, 3);
+  });
+
+  describe('error', () => {
+    it('with custom arguments', () => {
+      let attachLogger = require(pathToLoggerLib);
+      attachLogger.error(1, 2, 3, 4);
+      expect(errorSpy).to.be.calledOnce;
+      expect(errorSpy).to.be.calledWith(1, 2, 3, 4);
+    });
+
+    it('with error', () => {
+      let attachLogger = require(pathToLoggerLib);
+      let errInstance = new Error('An error.');
+      attachLogger.error(errInstance, {
+        data: 1,
+      }, 2, 3);
+      expect(errorSpy).to.be.calledOnce;
+      // using calledWith doesn't work
+      let lastCallArgs = errorSpy.lastCall.args;
+
+      expect(lastCallArgs[3]).to.equal(3);
+      expect(lastCallArgs[2]).to.equal(2);
+      expect(lastCallArgs[1]).to.eql({
+        data: 1,
+        fullError: errInstance,
+      });
+      expect(lastCallArgs[0]).to.eql(errInstance.stack);
+    });
+  });
+});