Improve errors with the domaine and how to use the API

spec/core/formatErrorMsgSpec.js

@@ -0,0 +1,69 @@
+describe('formatErrorMsg', function () {
+
+  it('should return a factory', function() {
+    expect(typeof jasmineUnderTest.formatErrorMsg).toBe('function');
+  });
+
+
+  describe('Format an error with a domain', function() {
+
+    var formator;
+
+    beforeEach(function() {
+      formator = jasmineUnderTest.formatErrorMsg('api');
+    });
+
+    it('should format the output', function() {
+      expect(formator('message').trim()).toBe('api : message');
+      expect(formator('message2').trim()).toBe('api : message2');
+    });
+
+  });
+
+
+  describe('Format an error with a domain and usage', function() {
+
+    var formator;
+
+    beforeEach(function() {
+      formator = jasmineUnderTest.formatErrorMsg('api', 'with a param');
+    });
+
+    it('should format the output', function() {
+      expect(formator('message').trim()).toBe('api : message\nUsage: with a param');
+      expect(formator('message2').trim()).toBe('api : message2\nUsage: with a param');
+    });
+
+  });
+
+  describe('Format an error with a domain, usage, Tips', function() {
+
+    var formator;
+
+    beforeEach(function() {
+      formator = jasmineUnderTest.formatErrorMsg('api', 'with a param', 'you can do it');
+    });
+
+    it('should format the output', function() {
+      expect(formator('message').trim()).toBe('api : message\nUsage: with a param\nTips: you can do it');
+      expect(formator('message2').trim()).toBe('api : message2\nUsage: with a param\nTips: you can do it');
+    });
+
+  });
+
+  describe('Format an error with a domain no usage and Tips', function() {
+
+    var formator;
+
+    beforeEach(function() {
+      formator = jasmineUnderTest.formatErrorMsg('api', null, 'you can do it');
+    });
+
+    it('should format the output', function() {
+      expect(formator('message').trim()).toBe('api : message\nTips: you can do it');
+      expect(formator('message2').trim()).toBe('api : message2\nTips: you can do it');
+    });
+
+  });
+
+});