Unit tests for document list component

ng2-components/ng2-alfresco-documentlist/src/components/content-column-list.spec.ts

@@ -41,9 +41,24 @@ describe('ContentColumnList', () => {
     it('should register column within parent document list', () => {
         expect(documentList.columns.length).toBe(0);
 
-        columnList.registerColumn(new ContentColumnModel());
+        let result = columnList.registerColumn(new ContentColumnModel());
 
+        expect(result).toBeTruthy();
         expect(documentList.columns.length).toBe(1);
     });
 
+    it('should require document list instance to register action', () => {
+        columnList = new ContentColumnList(null);
+        let col = new ContentColumnModel();
+        expect(columnList.registerColumn(col)).toBeFalsy();
+    });
+
+    it('should require action instance to register', () => {
+        spyOn(documentList.actions, 'push').and.callThrough();
+        let result = columnList.registerColumn(null);
+
+        expect(result).toBeFalsy();
+        expect(documentList.actions.push).not.toHaveBeenCalled();
+    });
+
 });