Add a test for the pretty formatter

Author: julienw

package.json

@@ -10,6 +10,7 @@
   "devDependencies": {
     "insist": "^0.2.3",
     "mocha": "^2.0",
+    "strip-ansi": "^3.0.0",
     "tv4": "^1.1.0"
   },
   "scripts": {

test/pretty_formatter.js

@@ -0,0 +1,62 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+'use strict'
+
+const assert = require('assert');
+const stripAnsi = require('strip-ansi');
+
+const NAMESPACE = 'mozlog_pretty'
+
+const mozlog = require('../');
+
+var lastLog;
+var writer = {
+  write: function(str) {
+    lastLog = stripAnsi(str);
+    return true;
+  }
+};
+
+const fxaLog = mozlog({
+  app: NAMESPACE,
+  fmt: 'pretty',
+  stream: writer,
+});
+
+var logger = fxaLog('test.pretty');
+
+/*global describe,it,beforeEach,afterEach*/
+
+describe('pretty formatter', function() {
+  it('should serialize objects to JSON strings', function() {
+    var obj = { foo: { bar: 'baz' }, quux: 'baz' };
+    logger.info('json', obj);
+    assert.equal(lastLog, 'mozlog_pretty.test.pretty.INFO: json {"foo":{"bar":"baz"},"quux":"baz"}\n');
+  });
+
+  it('should serialize circular objects', function() {
+    var obj = { foo: {} };
+    obj.foo.bar = obj;
+    logger.info('jsoncircles', obj);
+    assert.equal(lastLog, 'mozlog_pretty.test.pretty.INFO: jsoncircles {"foo":{"bar":"[Circular]"}}\n');
+  });
+
+  it('should serialize errors', function() {
+    var err1 = new Error('foo');
+    logger.error('errors', err1);
+    assert(lastLog.startsWith('mozlog_pretty.test.pretty.ERROR: errors Error: foo'));
+  });
+
+  it('should serialize nested errors', function() {
+    var err1 = new Error('foo');
+    logger.error('errors', { obj: err1 });
+    assert.equal(lastLog, 'mozlog_pretty.test.pretty.ERROR: errors {"obj":"Error: foo"}\n');
+  });
+
+  it('should coerce messages to strings', function() {
+    var out = logger.warn('message', 42);
+    assert.equal(lastLog, 'mozlog_pretty.test.pretty.WARN: message 42\n');
+  });
+});

test/schema.js

@@ -8,7 +8,7 @@ const assert = require('insist');
 const tv4 = require('tv4');
 const intel = require('intel');
 const HEKA_SCHEMA = require('./schema.json');
-const NAMESPACE = 'mozlog'
+const NAMESPACE = 'mozlog_schema'
 
 const mozlog = require('../');