Added specs for mutations & utils methods

spec/javascripts/diffs/store/mutations_spec.js

@@ -628,4 +628,26 @@ describe('DiffsStoreMutations', () => {
       expect(file.parallel_diff_lines[1].right.hasForm).toBe(false);
     });
   });
+
+  describe('SET_TREE_DATA', () => {
+    it('sets treeEntries and tree in state', () => {
+      const state = {
+        treeEntries: {},
+        tree: [],
+      };
+
+      mutations[types.SET_TREE_DATA](state, {
+        treeEntries: { file: { name: 'index.js' } },
+        tree: ['tree'],
+      });
+
+      expect(state.treeEntries).toEqual({
+        file: {
+          name: 'index.js',
+        },
+      });
+
+      expect(state.tree).toEqual(['tree']);
+    });
+  });
 });

spec/javascripts/diffs/store/utils_spec.js

@@ -601,4 +601,123 @@ describe('DiffsStoreUtils', () => {
       expect(utils.getDiffMode({})).toBe('replaced');
     });
   });
+
+  describe('getLowestSingleFolder', () => {
+    it('returns path and tree of lowest single folder tree', () => {
+      const folder = {
+        name: 'app',
+        type: 'tree',
+        tree: [
+          {
+            name: 'javascripts',
+            type: 'tree',
+            tree: [
+              {
+                type: 'blob',
+                name: 'index.js',
+              },
+            ],
+          },
+        ],
+      };
+      const { path, treeAcc } = utils.getLowestSingleFolder(folder);
+
+      expect(path).toEqual('app/javascripts');
+      expect(treeAcc).toEqual([
+        {
+          type: 'blob',
+          name: 'index.js',
+        },
+      ]);
+    });
+
+    it('returns passed in folders path & tree when more than tree exists', () => {
+      const folder = {
+        name: 'app',
+        type: 'tree',
+        tree: [
+          {
+            name: 'spec',
+            type: 'blob',
+            tree: [],
+          },
+        ],
+      };
+      const { path, treeAcc } = utils.getLowestSingleFolder(folder);
+
+      expect(path).toEqual('app');
+      expect(treeAcc).toBeNull();
+    });
+  });
+
+  describe('flattenTree', () => {
+    it('returns flattened directory structure', () => {
+      const tree = [
+        {
+          type: 'tree',
+          name: 'app',
+          tree: [
+            {
+              type: 'tree',
+              name: 'javascripts',
+              tree: [
+                {
+                  type: 'blob',
+                  name: 'index.js',
+                  tree: [],
+                },
+              ],
+            },
+          ],
+        },
+        {
+          type: 'tree',
+          name: 'spec',
+          tree: [
+            {
+              type: 'tree',
+              name: 'javascripts',
+              tree: [],
+            },
+            {
+              type: 'blob',
+              name: 'index_spec.js',
+              tree: [],
+            },
+          ],
+        },
+      ];
+      const flattened = utils.flattenTree(tree);
+
+      expect(flattened).toEqual([
+        {
+          type: 'tree',
+          name: 'app/javascripts',
+          tree: [
+            {
+              type: 'blob',
+              name: 'index.js',
+              tree: [],
+            },
+          ],
+        },
+        {
+          type: 'tree',
+          name: 'spec',
+          tree: [
+            {
+              type: 'tree',
+              name: 'javascripts',
+              tree: [],
+            },
+            {
+              type: 'blob',
+              name: 'index_spec.js',
+              tree: [],
+            },
+          ],
+        },
+      ]);
+    });
+  });
 });