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diff --git a/spec/javascripts/repo/stores/mutations/file_spec.js b/spec/javascripts/repo/stores/mutations/file_spec.js
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+++ b/spec/javascripts/repo/stores/mutations/file_spec.js
@@ -0,0 +1,131 @@
+import mutations from '~/repo/stores/mutations/file';
+import state from '~/repo/stores/state';
+import { file } from '../../helpers';
+
+describe('Multi-file store file mutations', () => {
+  let localState;
+  let localFile;
+
+  beforeEach(() => {
+    localState = state();
+    localFile = file();
+  });
+
+  describe('SET_FILE_ACTIVE', () => {
+    it('sets the file active', () => {
+      mutations.SET_FILE_ACTIVE(localState, {
+        file: localFile,
+        active: true,
+      });
+
+      expect(localFile.active).toBeTruthy();
+    });
+  });
+
+  describe('TOGGLE_FILE_OPEN', () => {
+    beforeEach(() => {
+      mutations.TOGGLE_FILE_OPEN(localState, localFile);
+    });
+
+    it('adds into opened files', () => {
+      expect(localFile.opened).toBeTruthy();
+      expect(localState.openFiles.length).toBe(1);
+    });
+
+    it('removes from opened files', () => {
+      mutations.TOGGLE_FILE_OPEN(localState, localFile);
+
+      expect(localFile.opened).toBeFalsy();
+      expect(localState.openFiles.length).toBe(0);
+    });
+  });
+
+  describe('SET_FILE_DATA', () => {
+    it('sets extra file data', () => {
+      mutations.SET_FILE_DATA(localState, {
+        data: {
+          blame_path: 'blame',
+          commits_path: 'commits',
+          permalink: 'permalink',
+          raw_path: 'raw',
+          binary: true,
+          html: 'html',
+          render_error: 'render_error',
+        },
+        file: localFile,
+      });
+
+      expect(localFile.blamePath).toBe('blame');
+      expect(localFile.commitsPath).toBe('commits');
+      expect(localFile.permalink).toBe('permalink');
+      expect(localFile.rawPath).toBe('raw');
+      expect(localFile.binary).toBeTruthy();
+      expect(localFile.html).toBe('html');
+      expect(localFile.renderError).toBe('render_error');
+    });
+  });
+
+  describe('SET_FILE_RAW_DATA', () => {
+    it('sets raw data', () => {
+      mutations.SET_FILE_RAW_DATA(localState, {
+        file: localFile,
+        raw: 'testing',
+      });
+
+      expect(localFile.raw).toBe('testing');
+    });
+  });
+
+  describe('UPDATE_FILE_CONTENT', () => {
+    beforeEach(() => {
+      localFile.raw = 'test';
+    });
+
+    it('sets content', () => {
+      mutations.UPDATE_FILE_CONTENT(localState, {
+        file: localFile,
+        content: 'test',
+      });
+
+      expect(localFile.content).toBe('test');
+    });
+
+    it('sets changed if content does not match raw', () => {
+      mutations.UPDATE_FILE_CONTENT(localState, {
+        file: localFile,
+        content: 'testing',
+      });
+
+      expect(localFile.content).toBe('testing');
+      expect(localFile.changed).toBeTruthy();
+    });
+  });
+
+  describe('DISCARD_FILE_CHANGES', () => {
+    beforeEach(() => {
+      localFile.content = 'test';
+      localFile.changed = true;
+    });
+
+    it('resets content and changed', () => {
+      mutations.DISCARD_FILE_CHANGES(localState, localFile);
+
+      expect(localFile.content).toBe('');
+      expect(localFile.changed).toBeFalsy();
+    });
+  });
+
+  describe('CREATE_TMP_FILE', () => {
+    it('adds file into parent tree', () => {
+      const f = file();
+
+      mutations.CREATE_TMP_FILE(localState, {
+        file: f,
+        parent: localFile,
+      });
+
+      expect(localFile.tree.length).toBe(1);
+      expect(localFile.tree[0].name).toBe(f.name);
+    });
+  });
+});