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diff --git a/spec/frontend/releases/stores/modules/detail/mutations_spec.js b/spec/frontend/releases/stores/modules/detail/mutations_spec.js
new file mode 100644
index 00000000000..81b2dde75ab
--- /dev/null
+++ b/spec/frontend/releases/stores/modules/detail/mutations_spec.js
@@ -0,0 +1,119 @@
+/* eslint-disable jest/valid-describe */
+/*
+ * ESLint disable directive ↑ can be removed once
+ * https://github.com/jest-community/eslint-plugin-jest/issues/203
+ * is resolved
+ */
+
+import state from '~/releases/stores/modules/detail/state';
+import mutations from '~/releases/stores/modules/detail/mutations';
+import * as types from '~/releases/stores/modules/detail/mutation_types';
+import { release } from '../../../mock_data';
+
+describe('Release detail mutations', () => {
+  let stateClone;
+  let releaseClone;
+
+  beforeEach(() => {
+    stateClone = state();
+    releaseClone = JSON.parse(JSON.stringify(release));
+  });
+
+  describe(types.SET_INITIAL_STATE, () => {
+    it('populates the state with initial values', () => {
+      const initialState = {
+        projectId: '18',
+        tagName: 'v1.3',
+        releasesPagePath: 'path/to/releases/page',
+        markdownDocsPath: 'path/to/markdown/docs',
+        markdownPreviewPath: 'path/to/markdown/preview',
+      };
+
+      mutations[types.SET_INITIAL_STATE](stateClone, initialState);
+
+      expect(stateClone).toEqual(expect.objectContaining(initialState));
+    });
+  });
+
+  describe(types.REQUEST_RELEASE, () => {
+    it('set state.isFetchingRelease to true', () => {
+      mutations[types.REQUEST_RELEASE](stateClone);
+
+      expect(stateClone.isFetchingRelease).toEqual(true);
+    });
+  });
+
+  describe(types.RECEIVE_RELEASE_SUCCESS, () => {
+    it('handles a successful response from the server', () => {
+      mutations[types.RECEIVE_RELEASE_SUCCESS](stateClone, releaseClone);
+
+      expect(stateClone.fetchError).toEqual(undefined);
+
+      expect(stateClone.isFetchingRelease).toEqual(false);
+
+      expect(stateClone.release).toEqual(releaseClone);
+    });
+  });
+
+  describe(types.RECEIVE_RELEASE_ERROR, () => {
+    it('handles an unsuccessful response from the server', () => {
+      const error = { message: 'An error occurred!' };
+      mutations[types.RECEIVE_RELEASE_ERROR](stateClone, error);
+
+      expect(stateClone.isFetchingRelease).toEqual(false);
+
+      expect(stateClone.release).toBeUndefined();
+
+      expect(stateClone.fetchError).toEqual(error);
+    });
+  });
+
+  describe(types.UPDATE_RELEASE_TITLE, () => {
+    it("updates the release's title", () => {
+      stateClone.release = releaseClone;
+      const newTitle = 'The new release title';
+      mutations[types.UPDATE_RELEASE_TITLE](stateClone, newTitle);
+
+      expect(stateClone.release.name).toEqual(newTitle);
+    });
+  });
+
+  describe(types.UPDATE_RELEASE_NOTES, () => {
+    it("updates the release's notes", () => {
+      stateClone.release = releaseClone;
+      const newNotes = 'The new release notes';
+      mutations[types.UPDATE_RELEASE_NOTES](stateClone, newNotes);
+
+      expect(stateClone.release.description).toEqual(newNotes);
+    });
+  });
+
+  describe(types.REQUEST_UPDATE_RELEASE, () => {
+    it('set state.isUpdatingRelease to true', () => {
+      mutations[types.REQUEST_UPDATE_RELEASE](stateClone);
+
+      expect(stateClone.isUpdatingRelease).toEqual(true);
+    });
+  });
+
+  describe(types.RECEIVE_UPDATE_RELEASE_SUCCESS, () => {
+    it('handles a successful response from the server', () => {
+      mutations[types.RECEIVE_UPDATE_RELEASE_SUCCESS](stateClone, releaseClone);
+
+      expect(stateClone.updateError).toEqual(undefined);
+
+      expect(stateClone.isUpdatingRelease).toEqual(false);
+    });
+  });
+
+  describe(types.RECEIVE_UPDATE_RELEASE_ERROR, () => {
+    it('handles an unsuccessful response from the server', () => {
+      const error = { message: 'An error occurred!' };
+      mutations[types.RECEIVE_UPDATE_RELEASE_ERROR](stateClone, error);
+
+      expect(stateClone.isUpdatingRelease).toEqual(false);
+
+      expect(stateClone.updateError).toEqual(error);
+    });
+  });
+});