build(broccoli): add tree-differ for diffing broccoli trees

tools/broccoli/tree-differ.spec.ts

@@ -0,0 +1,190 @@
+/// <reference path="../typings/node/node.d.ts" />
+/// <reference path="../typings/jasmine/jasmine.d.ts" />
+
+let mockfs = require('mock-fs');
+import fs = require('fs');
+import TreeDiffer = require('./tree-differ');
+
+
+describe('TreeDiffer', () => {
+
+  afterEach(() => mockfs.restore());
+
+
+  describe('diff of changed files', () => {
+
+    it('should list all files but no directories during the first diff', () => {
+      let testDir = {
+        'dir1': {
+          'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)}),
+          'file-2.txt': mockfs.file({content: 'file-2.txt content', mtime: new Date(1000)}),
+          'subdir-1': {
+            'file-1.1.txt': mockfs.file({content: 'file-1.1.txt content', mtime: new Date(1000)})
+          },
+          'empty-dir': {}
+        }
+      };
+      mockfs(testDir);
+
+      let differ = new TreeDiffer('dir1');
+
+      let diffResult = differ.diffTree();
+
+      expect(diffResult.changedPaths)
+          .toEqual(['file-1.txt', 'file-2.txt', 'subdir-1/file-1.1.txt']);
+
+      expect(diffResult.removedPaths).toEqual([]);
+    });
+
+
+    it('should return empty diff if nothing has changed', () => {
+      let testDir = {
+        'dir1': {
+          'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)}),
+          'file-2.txt': mockfs.file({content: 'file-2.txt content', mtime: new Date(1000)}),
+          'subdir-1': {
+            'file-1.1.txt': mockfs.file({content: 'file-1.1.txt content', mtime: new Date(1000)})
+          },
+        }
+      };
+      mockfs(testDir);
+
+      let differ = new TreeDiffer('dir1');
+
+      let diffResult = differ.diffTree();
+
+      expect(diffResult.changedPaths).not.toEqual([]);
+      expect(diffResult.removedPaths).toEqual([]);
+
+      diffResult = differ.diffTree();
+
+      expect(diffResult.changedPaths).toEqual([]);
+      expect(diffResult.removedPaths).toEqual([]);
+    });
+
+
+    it('should list only changed files during the subsequent diffs', () => {
+      let testDir = {
+        'dir1': {
+          'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)}),
+          'file-2.txt': mockfs.file({content: 'file-2.txt content', mtime: new Date(1000)}),
+          'subdir-1': {
+            'file-1.1.txt':
+                mockfs.file({content: 'file-1.1.txt content', mtime: new Date(1000)})
+          }
+        }
+      };
+      mockfs(testDir);
+
+      let differ = new TreeDiffer('dir1');
+
+      let diffResult = differ.diffTree();
+
+      expect(diffResult.changedPaths)
+          .toEqual(['file-1.txt', 'file-2.txt', 'subdir-1/file-1.1.txt']);
+
+      // change two files
+      testDir['dir1']['file-1.txt'] = mockfs.file({content: 'new content', mtime: new Date(1000)});
+      testDir['dir1']['subdir-1']['file-1.1.txt'] =
+          mockfs.file({content: 'file-1.1.txt content', mtime: new Date(9999)});
+      mockfs(testDir);
+
+      diffResult = differ.diffTree();
+
+      expect(diffResult.changedPaths).toEqual(['file-1.txt', 'subdir-1/file-1.1.txt']);
+
+      expect(diffResult.removedPaths).toEqual([]);
+
+      // change one file
+      testDir['dir1']['file-1.txt'] = mockfs.file({content: 'super new', mtime: new Date(1000)});
+      mockfs(testDir);
+
+      diffResult = differ.diffTree();
+      expect(diffResult.changedPaths).toEqual(['file-1.txt']);
+    });
+  });
+
+  describe('diff of new files', () => {
+
+    it('should detect file additions and report them as changed files', () => {
+      let testDir = {
+        'dir1':
+            {'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)})}
+      };
+      mockfs(testDir);
+
+      let differ = new TreeDiffer('dir1');
+      differ.diffTree();
+
+      testDir['dir1']['file-2.txt'] = 'new file';
+      mockfs(testDir);
+
+      let diffResult = differ.diffTree();
+      expect(diffResult.changedPaths).toEqual(['file-2.txt']);
+    });
+  });
+
+
+  it('should detect file additions mixed with file changes', () => {
+    let testDir = {
+      'dir1': {'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)})}
+    };
+    mockfs(testDir);
+
+    let differ = new TreeDiffer('dir1');
+    differ.diffTree();
+
+    testDir['dir1']['file-1.txt'] = 'new content';
+    testDir['dir1']['file-2.txt'] = 'new file';
+    mockfs(testDir);
+
+    let diffResult = differ.diffTree();
+    expect(diffResult.changedPaths).toEqual(['file-1.txt', 'file-2.txt']);
+  });
+
+
+  describe('diff of removed files', () => {
+
+    it('should detect file removals and report them as removed files', () => {
+      let testDir = {
+        'dir1':
+            {'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)})}
+      };
+      mockfs(testDir);
+
+      let differ = new TreeDiffer('dir1');
+      differ.diffTree();
+
+      delete testDir['dir1']['file-1.txt'];
+      mockfs(testDir);
+
+      let diffResult = differ.diffTree();
+      expect(diffResult.changedPaths).toEqual([]);
+      expect(diffResult.removedPaths).toEqual(['file-1.txt']);
+    });
+  });
+
+
+  it('should detect file removals mixed with file changes and additions', () => {
+    let testDir = {
+      'dir1': {
+        'file-1.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)}),
+        'file-2.txt': mockfs.file({content: 'file-1.txt content', mtime: new Date(1000)})
+      }
+    };
+
+    mockfs(testDir);
+
+    let differ = new TreeDiffer('dir1');
+    differ.diffTree();
+
+    testDir['dir1']['file-1.txt'] = 'changed content';
+    delete testDir['dir1']['file-2.txt'];
+    testDir['dir1']['file-3.txt'] = 'new content';
+    mockfs(testDir);
+
+    let diffResult = differ.diffTree();
+    expect(diffResult.changedPaths).toEqual(['file-1.txt', 'file-3.txt']);
+    expect(diffResult.removedPaths).toEqual(['file-2.txt']);
+  });
+});