chore(doc-gen): add spaces when removing linebreaks for Jade _data.json files

Closes #3623

Closes #3997

docs/angular.io-package/processors/addJadeDataDocsProcessor.spec.js

@@ -0,0 +1,35 @@
+var mockPackage = require('../mocks/mockPackage');
+var Dgeni = require('dgeni');
+
+describe('addJadeDataDocsProcessor', function() {
+  var dgeni, injector, processor;
+
+  beforeEach(function() {
+    dgeni = new Dgeni([mockPackage()]);
+    injector = dgeni.configureInjector();
+    processor = injector.get('addJadeDataDocsProcessor');
+  });
+
+  it('should add a doc for each module', function() {
+    var docs = [
+      {
+        docType: 'module',
+        id: 'someModule',
+        exports: [{ name: 'MyClass', docType: 'class'}],
+        fileInfo: { baseName: 'x_y' },
+        description: 'some description\nsecond line'
+      }
+    ];
+    docs = processor.$process(docs);
+
+    expect(docs[1]).toEqual({
+      id : 'someModule-data',
+      aliases : [ 'someModule-data' ],
+      docType : 'jade-data',
+      originalDoc : docs[0],
+      data : [
+        { name : 'index', title : 'X Y', intro : 'some description second line' },
+        { name : 'MyClass-class', title : 'MyClass', varType : undefined }
+      ] });
+  });
+});