fix(in-memory-reporter): Fix bug in new InMemoryReport, now using nul…

…l-checks

lib/in-memory-report.js

@@ -1,11 +1,18 @@
+var Report = require('istanbul').Report
+var util = require('util')
 
 function InMemoryReport (opt) {
-  this.browser = opt.browser
-  this.emitter = opt.emitter
+  this.opt = opt
 }
 
+util.inherits(InMemoryReport, Report)
+
 InMemoryReport.prototype.writeReport = function (collector, sync) {
-  this.emitter.emit('coverage_complete', this.browser, collector.getFinalCoverage())
+  if (!this.opt.emitter || !this.opt.emitter.emit) {
+    console.error('Could not raise "coverage_complete" event, missing emitter because it was not supplied during initialization of the reporter')
+  } else {
+    this.opt.emitter.emit('coverage_complete', this.opt.browser, collector.getFinalCoverage())
+  }
 }
 
 InMemoryReport.TYPE = 'in-memory'

test/in-memory-report.spec.coffee

@@ -1,4 +1,5 @@
 InMemoryReport = require '../lib/in-memory-report'
+istanbul = require 'istanbul';
 
 describe 'InMemoryReport', ->  
 
@@ -17,3 +18,9 @@ describe 'InMemoryReport', ->
 
   it 'should be of type "in-memory"', ->
     expect(InMemoryReport.TYPE).to.be.equal('in-memory')
+
+  it 'should not fail when created without arguments', ->
+    expect(new InMemoryReport()).to.be.ok
+
+  it 'should inherit from Report', ->
+    expect(new InMemoryReport()).to.be.an.instanceof(istanbul.Report)