diff --git a/__tests__/internal-pattern.test.ts b/__tests__/internal-pattern.test.ts
index c6a1b2c..5a2fbcc 100644
--- a/__tests__/internal-pattern.test.ts
+++ b/__tests__/internal-pattern.test.ts
@@ -1,17 +1,9 @@
 import * as io from '../../io/src/io'
+import * as os from 'os'
 import * as path from 'path'
 import {MatchKind} from '../src/internal-match-kind'
 import {promises as fs} from 'fs'
-
-// Mock 'os' before importing Pattern
-/* eslint-disable import/first */
-/* eslint-disable @typescript-eslint/promise-function-async */
-// Note, @typescript-eslint/promise-function-async is a false positive due to the
-// mock factory delegate which returns any. Fixed in a future version of jest.
-jest.mock('os', () => jest.requireActual('os'))
-const os = jest.requireMock('os')
 import {Pattern} from '../src/internal-pattern'
-jest.resetModuleRegistry()
 
 const IS_WINDOWS = process.platform === 'win32'
 
@@ -32,19 +24,13 @@ describe('pattern', () => {
   })
 
   it('escapes homedir', async () => {
-    const originalHomedir = os.homedir
     const home = path.join(getTestTemp(), 'home-with-[and]')
     await fs.mkdir(home, {recursive: true})
-    try {
-      os.homedir = () => home
-      const pattern = new Pattern('~/m*')
+    const pattern = new Pattern('~/m*', undefined, home)
 
-      expect(pattern.searchPath).toBe(home)
-      expect(pattern.match(path.join(home, 'match'))).toBeTruthy()
-      expect(pattern.match(path.join(home, 'not-match'))).toBeFalsy()
-    } finally {
-      os.homedir = originalHomedir
-    }
+    expect(pattern.searchPath).toBe(home)
+    expect(pattern.match(path.join(home, 'match'))).toBeTruthy()
+    expect(pattern.match(path.join(home, 'not-match'))).toBeFalsy()
   })
 
   it('escapes root', async () => {
diff --git a/package-lock.json b/package-lock.json
index 043765e..3eb24c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,11 +4,6 @@
 	"lockfileVersion": 1,
 	"requires": true,
 	"dependencies": {
-		"@actions/core": {
-			"version": "1.2.1",
-			"resolved": "https://registry.npmjs.org/@actions/core/-/core-1.2.1.tgz",
-			"integrity": "sha512-xD+CQd9p4lU7ZfRqmUcbJpqR+Ss51rJRVeXMyOLrZQImN9/8Sy/BEUBnHO/UKD3z03R686PVTLfEPmkropGuLw=="
-		},
 		"balanced-match": {
 			"version": "1.0.0",
 			"resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
diff --git a/src/internal-path-helper.ts b/src/internal-path-helper.ts
index 7d9d0ef..0931bd2 100644
--- a/src/internal-path-helper.ts
+++ b/src/internal-path-helper.ts
@@ -1,5 +1,5 @@
-import * as assert from 'assert'
 import * as path from 'path'
+import assert from 'assert'
 
 const IS_WINDOWS = process.platform === 'win32'
 
diff --git a/src/internal-path.ts b/src/internal-path.ts
index 789cb11..47001d5 100644
--- a/src/internal-path.ts
+++ b/src/internal-path.ts
@@ -1,6 +1,6 @@
-import * as assert from 'assert'
 import * as path from 'path'
 import * as pathHelper from './internal-path-helper'
+import assert from 'assert'
 
 const IS_WINDOWS = process.platform === 'win32'
 
diff --git a/src/internal-pattern.ts b/src/internal-pattern.ts
index 2735ca7..348acca 100644
--- a/src/internal-pattern.ts
+++ b/src/internal-pattern.ts
@@ -1,7 +1,7 @@
-import * as assert from 'assert'
 import * as os from 'os'
 import * as path from 'path'
 import * as pathHelper from './internal-path-helper'
+import assert from 'assert'
 import {Minimatch, IMinimatch, IOptions as IMinimatchOptions} from 'minimatch'
 import {MatchKind} from './internal-match-kind'
 import {Path} from './internal-path'
@@ -48,8 +48,13 @@ export class Pattern {
   // https://github.com/typescript-eslint/typescript-eslint/issues/291
 
   constructor(pattern: string)
+  constructor(pattern: string, segments: undefined, homedir: string)
   constructor(negate: boolean, segments: string[])
-  constructor(patternOrNegate: string | boolean, segments?: string[]) {
+  constructor(
+    patternOrNegate: string | boolean,
+    segments?: string[],
+    homedir?: string
+  ) {
     // Pattern overload
     let pattern: string
     if (typeof patternOrNegate === 'string') {
@@ -78,7 +83,7 @@ export class Pattern {
     }
 
     // Normalize slashes and ensures absolute root
-    pattern = Pattern.fixupPattern(pattern)
+    pattern = Pattern.fixupPattern(pattern, homedir)
 
     // Segments
     this.segments = new Path(pattern).segments
@@ -177,7 +182,7 @@ export class Pattern {
   /**
    * Normalizes slashes and ensures absolute root
    */
-  private static fixupPattern(pattern: string): string {
+  private static fixupPattern(pattern: string, homedir?: string): string {
     // Empty
     assert(pattern, 'pattern cannot be empty')
 
@@ -206,7 +211,7 @@ export class Pattern {
     }
     // Replace leading `~` segment
     else if (pattern === '~' || pattern.startsWith(`~${path.sep}`)) {
-      const homedir = os.homedir()
+      homedir = homedir || os.homedir()
       assert(homedir, 'Unable to determine HOME directory')
       assert(
         pathHelper.hasAbsoluteRoot(homedir),