diff --git a/packages/experimental-utils/tests/eslint-utils/RuleCreator.test.ts b/packages/experimental-utils/tests/eslint-utils/RuleCreator.test.ts
new file mode 100644
index 00000000000..343d5f0e1aa
--- /dev/null
+++ b/packages/experimental-utils/tests/eslint-utils/RuleCreator.test.ts
@@ -0,0 +1,46 @@
+import { ESLintUtils } from '../../src';
+
+describe('RuleCreator', () => {
+  const createRule = ESLintUtils.RuleCreator(name => `test/${name}`);
+
+  it('createRule should be a function', () => {
+    expect(typeof createRule).toEqual('function');
+  });
+
+  it('should create rule correctly', () => {
+    const rule = createRule({
+      name: 'test',
+      meta: {
+        docs: {
+          description: 'some description',
+          category: 'Best Practices',
+          recommended: 'error',
+          requiresTypeChecking: true,
+        },
+        messages: {
+          foo: 'some message',
+        },
+        schema: [],
+        type: 'problem',
+      },
+      defaultOptions: [],
+      create() {
+        return {};
+      },
+    });
+    expect(rule.meta).toEqual({
+      docs: {
+        description: 'some description',
+        category: 'Best Practices',
+        url: 'test/test',
+        recommended: 'error',
+        requiresTypeChecking: true,
+      },
+      messages: {
+        foo: 'some message',
+      },
+      schema: [],
+      type: 'problem',
+    });
+  });
+});
diff --git a/packages/experimental-utils/tests/eslint-utils/applyDefault.test.ts b/packages/experimental-utils/tests/eslint-utils/applyDefault.test.ts
index c3304ec4871..ec9411c31c2 100644
--- a/packages/experimental-utils/tests/eslint-utils/applyDefault.test.ts
+++ b/packages/experimental-utils/tests/eslint-utils/applyDefault.test.ts
@@ -1,10 +1,10 @@
-import * as util from '../../src/eslint-utils/applyDefault';
+import { ESLintUtils } from '../../src';
 
 describe('applyDefault', () => {
   it('returns a clone of the default if no options given', () => {
     const defaults = [{ prop: 'setting' }];
     const user = null;
-    const result = util.applyDefault(defaults, user);
+    const result = ESLintUtils.applyDefault(defaults, user);
 
     expect(result).toStrictEqual(defaults);
     expect(result).not.toBe(defaults);
@@ -26,7 +26,7 @@ describe('applyDefault', () => {
         other: 'something',
       },
     ];
-    const result = util.applyDefault(defaults, user);
+    const result = ESLintUtils.applyDefault(defaults, user);
 
     expect(result).toStrictEqual([
       {
@@ -44,9 +44,19 @@ describe('applyDefault', () => {
   it('returns a brand new array', () => {
     const defaults: undefined[] = [];
     const user: undefined[] = [];
-    const result = util.applyDefault(defaults, user);
+    const result = ESLintUtils.applyDefault(defaults, user);
 
     expect(result).not.toBe(defaults);
     expect(result).not.toBe(user);
   });
+
+  it('should work with array of options', () => {
+    const defaults: unknown[] = ['1tbs'];
+    const user: unknown[] = ['2tbs'];
+    const result = ESLintUtils.applyDefault(defaults, user);
+
+    expect(result).toStrictEqual(['2tbs']);
+    expect(result).not.toBe(defaults);
+    expect(result).not.toBe(user);
+  });
 });
diff --git a/packages/experimental-utils/tests/eslint-utils/batchedSingleLineTests.test.ts b/packages/experimental-utils/tests/eslint-utils/batchedSingleLineTests.test.ts
new file mode 100644
index 00000000000..596bb480b94
--- /dev/null
+++ b/packages/experimental-utils/tests/eslint-utils/batchedSingleLineTests.test.ts
@@ -0,0 +1,81 @@
+import { ESLintUtils } from '../../src';
+
+describe('batchedSingleLineTests', () => {
+  const FIXTURES = `
+a
+b
+c
+  `;
+  const errors = [
+    { messageId: 'someMessage1', line: 2 },
+    { messageId: 'someMessage2', line: 3 },
+    { messageId: 'someMessage3', line: 4 },
+  ];
+  const options = [{ optionOne: 'value' }];
+
+  it('should work without options', () => {
+    expect(
+      ESLintUtils.batchedSingleLineTests({
+        code: FIXTURES,
+      }),
+    ).toEqual([
+      { code: 'a', errors: [] },
+      { code: 'b', errors: [] },
+      { code: 'c', errors: [] },
+    ]);
+  });
+
+  it('should work with errors', () => {
+    expect(
+      ESLintUtils.batchedSingleLineTests({
+        code: FIXTURES,
+        errors,
+      }),
+    ).toEqual([
+      { code: 'a', errors: [{ messageId: 'someMessage1', line: 1 }] },
+      { code: 'b', errors: [{ messageId: 'someMessage2', line: 1 }] },
+      { code: 'c', errors: [{ messageId: 'someMessage3', line: 1 }] },
+    ]);
+  });
+
+  it('should work with all fields', () => {
+    const filename = 'foo.ts';
+    const parser = 'some-parser';
+
+    expect(
+      ESLintUtils.batchedSingleLineTests({
+        code: FIXTURES,
+        errors,
+        options,
+        parser,
+        output: FIXTURES,
+        filename,
+      }),
+    ).toEqual([
+      {
+        code: 'a',
+        output: 'a',
+        errors: [{ messageId: 'someMessage1', line: 1 }],
+        parser,
+        filename,
+        options,
+      },
+      {
+        code: 'b',
+        output: 'b',
+        errors: [{ messageId: 'someMessage2', line: 1 }],
+        parser,
+        filename,
+        options,
+      },
+      {
+        code: 'c',
+        output: 'c',
+        errors: [{ messageId: 'someMessage3', line: 1 }],
+        parser,
+        filename,
+        options,
+      },
+    ]);
+  });
+});
diff --git a/packages/experimental-utils/tests/eslint-utils/deepMerge.test.ts b/packages/experimental-utils/tests/eslint-utils/deepMerge.test.ts
index 7caee854d49..26fb02e3bc4 100644
--- a/packages/experimental-utils/tests/eslint-utils/deepMerge.test.ts
+++ b/packages/experimental-utils/tests/eslint-utils/deepMerge.test.ts
@@ -1,10 +1,10 @@
-import * as util from '../../src/eslint-utils/deepMerge';
+import { ESLintUtils } from '../../src';
 
 describe('deepMerge', () => {
   it('creates a brand new object', () => {
     const a = {};
     const b = {};
-    const result = util.deepMerge(a, b);
+    const result = ESLintUtils.deepMerge(a, b);
 
     expect(result).not.toBe(a);
     expect(result).not.toBe(b);
@@ -38,7 +38,7 @@ describe('deepMerge', () => {
       },
     };
 
-    expect(util.deepMerge(a, b)).toStrictEqual(Object.assign({}, a, b));
+    expect(ESLintUtils.deepMerge(a, b)).toStrictEqual(Object.assign({}, a, b));
   });
 
   it('deeply overwrites properties in the first one with the second', () => {
@@ -53,6 +53,6 @@ describe('deepMerge', () => {
       },
     };
 
-    expect(util.deepMerge(a, b)).toStrictEqual(b);
+    expect(ESLintUtils.deepMerge(a, b)).toStrictEqual(b);
   });
 });