diff --git a/__tests__/distributors/adopt-installer.test.ts b/__tests__/distributors/adopt-installer.test.ts
index 8a112243..110b5cc3 100644
--- a/__tests__/distributors/adopt-installer.test.ts
+++ b/__tests__/distributors/adopt-installer.test.ts
@@ -8,6 +8,10 @@ import {JavaInstallerOptions} from '../../src/distributions/base-models';
 
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/adopt.json';
 
 describe('getAvailableVersions', () => {
@@ -191,7 +195,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
       const installerOptions: JavaInstallerOptions = {
         version: '17',
diff --git a/__tests__/distributors/base-installer.test.ts b/__tests__/distributors/base-installer.test.ts
index b2c61026..acf9f0c2 100644
--- a/__tests__/distributors/base-installer.test.ts
+++ b/__tests__/distributors/base-installer.test.ts
@@ -14,6 +14,10 @@ import {
 
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 class EmptyJavaBase extends JavaBase {
   constructor(installerOptions: JavaInstallerOptions) {
     super('Empty', installerOptions);
@@ -287,7 +291,7 @@ describe('setupJava', () => {
     spyCoreSetOutput = jest.spyOn(core, 'setOutput');
     spyCoreSetOutput.mockImplementation(() => undefined);
 
-    jest.spyOn(os, 'arch').mockReturnValue('x86');
+    jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture('x86'));
   });
 
   afterEach(() => {
diff --git a/__tests__/distributors/corretto-installer.test.ts b/__tests__/distributors/corretto-installer.test.ts
index a8ffef22..059020f5 100644
--- a/__tests__/distributors/corretto-installer.test.ts
+++ b/__tests__/distributors/corretto-installer.test.ts
@@ -6,6 +6,10 @@ import * as util from '../../src/util';
 import os from 'os';
 import {isGeneratorFunction} from 'util/types';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/corretto.json';
 
 describe('getAvailableVersions', () => {
@@ -208,7 +212,7 @@ describe('getAvailableVersions', () => {
     ])(
       'defaults to os.arch(): %s mapped to distro arch: %s',
       async (osArch: string, distroArch: string) => {
-        jest.spyOn(os, 'arch').mockReturnValue(osArch);
+        jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
         const version = '17';
         const installerOptions: JavaInstallerOptions = {
diff --git a/__tests__/distributors/graalvm-installer.test.ts b/__tests__/distributors/graalvm-installer.test.ts
index ae2db43c..8c2ab52b 100644
--- a/__tests__/distributors/graalvm-installer.test.ts
+++ b/__tests__/distributors/graalvm-installer.test.ts
@@ -1,5 +1,9 @@
 import {GraalVMDistribution} from '../../src/distributions/graalvm/installer';
 import os from 'os';
+
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
 import * as core from '@actions/core';
 import {getDownloadArchiveExtension} from '../../src/util';
 import {HttpClient} from '@actions/http-client';
@@ -103,7 +107,7 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
       jest.spyOn(os, 'platform').mockReturnValue('linux');
 
       const version = '21';
diff --git a/__tests__/distributors/liberica-installer.test.ts b/__tests__/distributors/liberica-installer.test.ts
index 33a51017..dada9223 100644
--- a/__tests__/distributors/liberica-installer.test.ts
+++ b/__tests__/distributors/liberica-installer.test.ts
@@ -6,6 +6,10 @@ import {
 import {HttpClient} from '@actions/http-client';
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/liberica.json';
 
 describe('getAvailableVersions', () => {
@@ -105,7 +109,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: DistroArch) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
       const distribution = new LibericaDistributions({
         version: '17',
diff --git a/__tests__/distributors/liberica-linux-installer.test.ts b/__tests__/distributors/liberica-linux-installer.test.ts
index 8e6a665e..a5511a12 100644
--- a/__tests__/distributors/liberica-linux-installer.test.ts
+++ b/__tests__/distributors/liberica-linux-installer.test.ts
@@ -6,6 +6,10 @@ import {
 import {HttpClient} from '@actions/http-client';
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/liberica-linux.json';
 
 describe('getAvailableVersions', () => {
@@ -105,7 +109,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: DistroArch) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
       const distribution = new LibericaDistributions({
         version: '17',
diff --git a/__tests__/distributors/liberica-windows-installer.test.ts b/__tests__/distributors/liberica-windows-installer.test.ts
index 1ccc57ed..1cbf18d2 100644
--- a/__tests__/distributors/liberica-windows-installer.test.ts
+++ b/__tests__/distributors/liberica-windows-installer.test.ts
@@ -6,6 +6,10 @@ import {
 import {HttpClient} from '@actions/http-client';
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/liberica-windows.json';
 
 describe('getAvailableVersions', () => {
@@ -105,7 +109,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: DistroArch) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
       const distribution = new LibericaDistributions({
         version: '17',
diff --git a/__tests__/distributors/microsoft-installer.test.ts b/__tests__/distributors/microsoft-installer.test.ts
index 00c4b6c6..ee526ff2 100644
--- a/__tests__/distributors/microsoft-installer.test.ts
+++ b/__tests__/distributors/microsoft-installer.test.ts
@@ -1,5 +1,9 @@
 import {MicrosoftDistributions} from '../../src/distributions/microsoft/installer';
 import os from 'os';
+
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
 import data from '../data/microsoft.json';
 import * as httpm from '@actions/http-client';
 import * as core from '@actions/core';
@@ -95,7 +99,7 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
       jest.spyOn(os, 'platform').mockReturnValue('darwin');
 
       const version = '17';
@@ -119,7 +123,7 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
       jest.spyOn(os, 'platform').mockReturnValue('linux');
 
       const version = '17';
@@ -143,7 +147,7 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
       jest.spyOn(os, 'platform').mockReturnValue('win32');
 
       const version = '17';
diff --git a/__tests__/distributors/oracle-installer.test.ts b/__tests__/distributors/oracle-installer.test.ts
index de391a54..edb90b32 100644
--- a/__tests__/distributors/oracle-installer.test.ts
+++ b/__tests__/distributors/oracle-installer.test.ts
@@ -1,5 +1,9 @@
 import {OracleDistribution} from '../../src/distributions/oracle/installer';
 import os from 'os';
+
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
 import * as core from '@actions/core';
 import {getDownloadArchiveExtension} from '../../src/util';
 import {HttpClient} from '@actions/http-client';
@@ -95,7 +99,7 @@ describe('findPackageForDownload', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
       jest.spyOn(os, 'platform').mockReturnValue('linux');
 
       const version = '18';
diff --git a/__tests__/distributors/temurin-installer.test.ts b/__tests__/distributors/temurin-installer.test.ts
index b8c9e7fd..0bdedaad 100644
--- a/__tests__/distributors/temurin-installer.test.ts
+++ b/__tests__/distributors/temurin-installer.test.ts
@@ -1,5 +1,9 @@
 import {HttpClient} from '@actions/http-client';
 import os from 'os';
+
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
 import {
   TemurinDistribution,
   TemurinImplementation
@@ -147,7 +151,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: string) => {
-      jest.spyOn(os, 'arch').mockReturnValue(distroArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(distroArch));
 
       const installerOptions: JavaInstallerOptions = {
         version: '17',
diff --git a/__tests__/distributors/zulu-installer.test.ts b/__tests__/distributors/zulu-installer.test.ts
index f8b8a72c..1b0fe449 100644
--- a/__tests__/distributors/zulu-installer.test.ts
+++ b/__tests__/distributors/zulu-installer.test.ts
@@ -5,6 +5,10 @@ import {IZuluVersions} from '../../src/distributions/zulu/models';
 import * as utils from '../../src/util';
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/zulu-releases-default.json';
 
 describe('getAvailableVersions', () => {
@@ -126,7 +130,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: DistroArch) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
       const distribution = new ZuluDistribution({
         version: '17',
diff --git a/__tests__/distributors/zulu-linux-installer.test.ts b/__tests__/distributors/zulu-linux-installer.test.ts
index 60f36ee5..946dbdda 100644
--- a/__tests__/distributors/zulu-linux-installer.test.ts
+++ b/__tests__/distributors/zulu-linux-installer.test.ts
@@ -5,6 +5,10 @@ import {IZuluVersions} from '../../src/distributions/zulu/models';
 import * as utils from '../../src/util';
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/zulu-linux.json';
 
 describe('getAvailableVersions', () => {
@@ -126,7 +130,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: DistroArch) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
       const distribution = new ZuluDistribution({
         version: '17',
diff --git a/__tests__/distributors/zulu-windows-installer.test.ts b/__tests__/distributors/zulu-windows-installer.test.ts
index dcac5aa0..b8e802eb 100644
--- a/__tests__/distributors/zulu-windows-installer.test.ts
+++ b/__tests__/distributors/zulu-windows-installer.test.ts
@@ -5,6 +5,10 @@ import {IZuluVersions} from '../../src/distributions/zulu/models';
 import * as utils from '../../src/util';
 import os from 'os';
 
+function mockArchitecture(arch: string): NodeJS.Architecture {
+  return arch as NodeJS.Architecture;
+}
+
 import manifestData from '../data/zulu-windows.json';
 
 describe('getAvailableVersions', () => {
@@ -126,7 +130,7 @@ describe('getAvailableVersions', () => {
   ])(
     'defaults to os.arch(): %s mapped to distro arch: %s',
     async (osArch: string, distroArch: DistroArch) => {
-      jest.spyOn(os, 'arch').mockReturnValue(osArch);
+      jest.spyOn(os, 'arch').mockReturnValue(mockArchitecture(osArch));
 
       const distribution = new ZuluDistribution({
         version: '17',
diff --git a/__tests__/toolchains.test.ts b/__tests__/toolchains.test.ts
index 483077dc..6d4bea26 100644
--- a/__tests__/toolchains.test.ts
+++ b/__tests__/toolchains.test.ts
@@ -6,7 +6,8 @@ import * as io from '@actions/io';
 import * as toolchains from '../src/toolchains';
 import {M2_DIR, MVN_TOOLCHAINS_FILE} from '../src/constants';
 
-const m2Dir = path.join(__dirname, M2_DIR);
+const tempDir = fs.mkdtempSync(path.join(os.tmpdir(), 'setup-java-test-'));
+const m2Dir = path.join(tempDir, M2_DIR);
 const toolchainsFile = path.join(m2Dir, MVN_TOOLCHAINS_FILE);
 
 describe('toolchains tests', () => {
@@ -16,7 +17,7 @@ describe('toolchains tests', () => {
   beforeEach(async () => {
     await io.rmRF(m2Dir);
     spyOSHomedir = jest.spyOn(os, 'homedir');
-    spyOSHomedir.mockReturnValue(__dirname);
+    spyOSHomedir.mockReturnValue(tempDir);
     spyInfo = jest.spyOn(core, 'info');
     spyInfo.mockImplementation(() => null);
   }, 300000);
@@ -24,6 +25,7 @@ describe('toolchains tests', () => {
   afterAll(async () => {
     try {
       await io.rmRF(m2Dir);
+      await io.rmRF(tempDir);
     } catch {
       console.log('Failed to remove test directories');
     }
@@ -40,7 +42,7 @@ describe('toolchains tests', () => {
       jdkHome: '/opt/hostedtoolcache/Java_Temurin-Hotspot_jdk/17.0.1-12/x64'
     };
 
-    const altHome = path.join(__dirname, 'runner', 'toolchains');
+    const altHome = path.join(tempDir, 'runner', 'toolchains');
     const altToolchainsFile = path.join(altHome, MVN_TOOLCHAINS_FILE);
     await io.rmRF(altHome); // ensure it doesn't already exist