chore(test): improve test coverage for common-log (#421)

fixes #416

test/common-log-test.js

@@ -0,0 +1,80 @@
+const test = require('tape');
+const sinon = require('sinon');
+const proxyquire = require('proxyquire').noPreserveCache();
+
+test('common-log should be a function', (t) => {
+  const commonLog = require('../lib/common-log');
+  t.equal(typeof commonLog, 'function', 'should pass');
+  t.end();
+});
+
+test('common-log exports', (t) => {
+  process.env.NODESHIFT_QUIET = true;
+  const log = proxyquire('../lib/common-log', {})();
+
+  t.equal(typeof log, 'object', 'should pass');
+  t.notEqual(typeof log.info, 'undefined', 'info method should be exported');
+  t.notEqual(typeof log.warning, 'undefined', 'warning method should be exported');
+  t.notEqual(typeof log.error, 'undefined', 'error method should be exported');
+  t.notEqual(typeof log.trace, 'undefined', 'trace method should be exported');
+  t.end();
+});
+
+test('common-log exports when NODESHIFT_QUIET is false', (t) => {
+  const cache = process.env.NODESHIFT_QUIET;
+  process.env.NODESHIFT_QUIET = false;
+
+  const log = proxyquire('../lib/common-log', {})();
+  const noop = _ => {};
+
+  t.notEqual(log.info.toString(), noop.toString(), 'info method should not be noop');
+  t.notEqual(log.trace.toString(), noop.toString(), 'trace method should not be noop');
+  t.end();
+
+  // reset process.env
+  process.env.NODESHIFT_QUIET = cache;
+});
+
+test('common-log exports type', (t) => {
+  const log = require('../lib/common-log')();
+
+  t.equal(typeof log.info, 'function', 'info method should be function');
+  t.equal(typeof log.warning, 'function', 'warning method should be function');
+  t.equal(typeof log.error, 'function', 'error method should be function');
+  t.equal(typeof log.trace, 'function', 'trace method should be function');
+  t.end();
+});
+
+test('common-log info method', (t) => {
+  const cache = process.env.NODESHIFT_QUIET;
+  process.env.NODESHIFT_QUIET = false;
+
+  const spy = sinon.spy(console, 'log');
+
+  const { info } = proxyquire('../lib/common-log', {})();
+  info();
+
+  t.equal(spy.callCount, 1, 'should call console.log');
+  t.end();
+
+  // reset
+  spy.restore();
+  process.env.NODESHIFT_QUIET = cache;
+});
+
+test('common-log trace method', (t) => {
+  const cache = process.env.NODESHIFT_QUIET;
+  process.env.NODESHIFT_QUIET = false;
+
+  const spy = sinon.spy(console, 'log');
+
+  const { trace } = proxyquire('../lib/common-log', {})();
+  trace();
+
+  t.equal(spy.callCount, 1, 'should call console.log');
+  t.end();
+
+  // reset
+  spy.restore();
+  process.env.NODESHIFT_QUIET = cache;
+});