diff --git a/packages/kbn-optimizer/src/optimizer/cache_keys.test.ts b/packages/kbn-optimizer/src/optimizer/cache_keys.test.ts
deleted file mode 100644
index 2337017f54ed..000000000000
--- a/packages/kbn-optimizer/src/optimizer/cache_keys.test.ts
+++ /dev/null
@@ -1,206 +0,0 @@
-/*
- * Licensed to Elasticsearch B.V. under one or more contributor
- * license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright
- * ownership. Elasticsearch B.V. licenses this file to you under
- * the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *    http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-import Path from 'path';
-
-import jestDiff from 'jest-diff';
-import { REPO_ROOT, createAbsolutePathSerializer } from '@kbn/dev-utils';
-
-import { reformatJestDiff, getOptimizerCacheKey, diffCacheKey } from './cache_keys';
-import { OptimizerConfig } from './optimizer_config';
-
-jest.mock('./get_changes.ts', () => ({
-  getChanges: async () =>
-    new Map([
-      ['/foo/bar/a', 'modified'],
-      ['/foo/bar/b', 'modified'],
-      ['/foo/bar/c', 'deleted'],
-    ]),
-}));
-
-jest.mock('./get_mtimes.ts', () => ({
-  getMtimes: async (paths: string[]) => new Map(paths.map(path => [path, 12345])),
-}));
-
-jest.mock('execa');
-
-jest.mock('fs', () => {
-  const realFs = jest.requireActual('fs');
-  jest.spyOn(realFs, 'readFile');
-  return realFs;
-});
-
-expect.addSnapshotSerializer(createAbsolutePathSerializer());
-
-jest.requireMock('execa').mockImplementation(async (cmd: string, args: string[], opts: object) => {
-  expect(cmd).toBe('git');
-  expect(args).toEqual([
-    'log',
-    '-n',
-    '1',
-    '--pretty=format:%H',
-    '--',
-    expect.stringContaining('kbn-optimizer'),
-  ]);
-  expect(opts).toEqual({
-    cwd: REPO_ROOT,
-  });
-
-  return {
-    stdout: '<last commit sha>',
-  };
-});
-
-describe('getOptimizerCacheKey()', () => {
-  it('uses latest commit, bootstrap cache, and changed files to create unique value', async () => {
-    jest
-      .requireMock('fs')
-      .readFile.mockImplementation(
-        (path: string, enc: string, cb: (err: null, file: string) => void) => {
-          expect(path).toBe(
-            Path.resolve(REPO_ROOT, 'packages/kbn-optimizer/target/.bootstrap-cache')
-          );
-          expect(enc).toBe('utf8');
-          cb(null, '<bootstrap cache>');
-        }
-      );
-
-    const config = OptimizerConfig.create({
-      repoRoot: REPO_ROOT,
-    });
-
-    await expect(getOptimizerCacheKey(config)).resolves.toMatchInlineSnapshot(`
-            Object {
-              "bootstrap": "<bootstrap cache>",
-              "deletedPaths": Array [
-                "/foo/bar/c",
-              ],
-              "lastCommit": "<last commit sha>",
-              "modifiedTimes": Object {
-                "/foo/bar/a": 12345,
-                "/foo/bar/b": 12345,
-              },
-              "workerConfig": Object {
-                "browserslistEnv": "dev",
-                "cache": true,
-                "dist": false,
-                "optimizerCacheKey": "♻",
-                "profileWebpack": false,
-                "repoRoot": <absolute path>,
-                "watch": false,
-              },
-            }
-          `);
-  });
-});
-
-describe('diffCacheKey()', () => {
-  it('returns undefined if values are equal', () => {
-    expect(diffCacheKey('1', '1')).toBe(undefined);
-    expect(diffCacheKey(1, 1)).toBe(undefined);
-    expect(diffCacheKey(['1', '2', { a: 'b' }], ['1', '2', { a: 'b' }])).toBe(undefined);
-    expect(
-      diffCacheKey(
-        {
-          a: '1',
-          b: '2',
-        },
-        {
-          b: '2',
-          a: '1',
-        }
-      )
-    ).toBe(undefined);
-  });
-
-  it('returns a diff if the values are different', () => {
-    expect(diffCacheKey(['1', '2', { a: 'b' }], ['1', '2', { b: 'a' }])).toMatchInlineSnapshot(`
-      "- Expected
-      + Received
-
-        Array [
-          \\"1\\",
-          \\"2\\",
-          Object {
-      -     \\"a\\": \\"b\\",
-      +     \\"b\\": \\"a\\",
-          },
-        ]"
-    `);
-    expect(
-      diffCacheKey(
-        {
-          a: '1',
-          b: '1',
-        },
-        {
-          b: '2',
-          a: '2',
-        }
-      )
-    ).toMatchInlineSnapshot(`
-      "- Expected
-      + Received
-
-        Object {
-      -   \\"a\\": \\"1\\",
-      -   \\"b\\": \\"1\\",
-      +   \\"a\\": \\"2\\",
-      +   \\"b\\": \\"2\\",
-        }"
-    `);
-  });
-});
-
-describe('reformatJestDiff()', () => {
-  it('reformats large jestDiff output to focus on the changed lines', () => {
-    const diff = jestDiff(
-      {
-        a: ['1', '1', '1', '1', '1', '1', '1', '2', '1', '1', '1', '1', '1', '1', '1', '1', '1'],
-      },
-      {
-        b: ['1', '1', '1', '1', '1', '1', '1', '1', '1', '1', '1', '1', '2', '1', '1', '1', '1'],
-      }
-    );
-
-    expect(reformatJestDiff(diff)).toMatchInlineSnapshot(`
-      "- Expected
-      + Received
-
-        Object {
-      -   \\"a\\": Array [
-      +   \\"b\\": Array [
-            \\"1\\",
-            \\"1\\",
-            ...
-            \\"1\\",
-            \\"1\\",
-      -     \\"2\\",
-            \\"1\\",
-            \\"1\\",
-            ...
-            \\"1\\",
-            \\"1\\",
-      +     \\"2\\",
-            \\"1\\",
-            \\"1\\",
-            ..."
-    `);
-  });
-});