chore(changelog): add test for addition of trailing newline

Adds tests for the functionality added by angular#9550.

Closes angular#10358

Author: gkalpak

changelog.js

@@ -202,6 +202,7 @@ var generate = function(version, file) {
 
 // publish for testing
 exports.parseRawCommit = parseRawCommit;
+exports.printSection = printSection;
 
 // hacky start if not run by jasmine :-D
 if (process.argv.join('').indexOf('jasmine-node') === -1) {

changelog.spec.js

@@ -1,4 +1,4 @@
-/* global describe: false, it: false, expect: false */
+/* global describe: false, beforeEach: false, afterEach: false, it: false, expect: false */
 
 'use strict';
 
@@ -44,4 +44,65 @@ describe('changelog.js', function() {
       expect(msg.breaking).toEqual(' first breaking change\nsomething else\nanother line with more info\n');
     });
   });
+
+  describe('printSection', function() {
+    var output;
+    var streamMock = {
+      write: function(str) {
+        output += str;
+      }
+    };
+
+    beforeEach(function() {
+      output = '';
+    });
+
+    it('should add a new line at the end of each breaking change list item ' +
+       'when there is 1 item per component', function() {
+      var title = 'test';
+      var printCommitLinks = false;
+
+      var section = {
+        module1: [{subject: 'breaking change 1'}],
+        module2: [{subject: 'breaking change 2'}]
+      };
+      var expectedOutput =
+          '\n' + '## test\n\n' +
+          '- **module1:** breaking change 1\n' +
+          '- **module2:** breaking change 2\n' +
+          '\n';
+
+      ch.printSection(streamMock, title, section, printCommitLinks);
+      expect(output).toBe(expectedOutput);
+    });
+
+    it('should add a new line at the end of each breaking change list item ' +
+       'when there are multiple items per component', function() {
+      var title = 'test';
+      var printCommitLinks = false;
+
+      var section = {
+        module1: [
+          {subject: 'breaking change 1.1'},
+          {subject: 'breaking change 1.2'}
+        ],
+        module2: [
+          {subject: 'breaking change 2.1'},
+          {subject: 'breaking change 2.2'}
+        ]
+      };
+      var expectedOutput =
+          '\n' + '## test\n\n' +
+          '- **module1:**\n' +
+          '  - breaking change 1.1\n' +
+          '  - breaking change 1.2\n' +
+          '- **module2:**\n' +
+          '  - breaking change 2.1\n' +
+          '  - breaking change 2.2\n' +
+          '\n';
+
+      ch.printSection(streamMock, title, section, printCommitLinks);
+      expect(output).toBe(expectedOutput);
+    });
+  });
 });