Add an optional architecture parameter to set the target architecture (x86, x64, arm64, ...).

__tests__/installer.test.ts

@@ -107,6 +107,24 @@ describe('DotnetCoreInstaller tests', () => {
     expect(process.env.PATH?.startsWith(toolDir)).toBe(true);
   }, 600000); //This needs some time to download on "slower" internet connections
 
+  it('Acquires architecture-specific version of dotnet if no matching version is installed', async () => {
+    await getDotnet('3.1', '', 'x64');
+    var directory = fs
+      .readdirSync(path.join(toolDir, 'sdk'))
+      .filter(fn => fn.startsWith('3.1.'));
+    expect(directory.length > 0).toBe(true);
+    if (IS_WINDOWS) {
+      expect(fs.existsSync(path.join(toolDir, 'dotnet.exe'))).toBe(true);
+    } else {
+      expect(fs.existsSync(path.join(toolDir, 'dotnet'))).toBe(true);
+    }
+
+    expect(process.env.DOTNET_ROOT).toBeDefined;
+    expect(process.env.PATH).toBeDefined;
+    expect(process.env.DOTNET_ROOT).toBe(toolDir);
+    expect(process.env.PATH?.startsWith(toolDir)).toBe(true);
+  }, 600000); //This needs some time to download on "slower" internet connections
+
   it('Returns string with installed SDK version', async () => {
     const version = '3.1.120';
     let installedVersion: string;
@@ -279,10 +297,12 @@ function normalizeFileContents(contents: string): string {
 async function getDotnet(
   version: string,
   quality: string = ''
+  architecture: string = ''
 ): Promise<string> {
   const dotnetInstaller = new installer.DotnetCoreInstaller(
     version,
-    quality as QualityOptions
+    quality as QualityOptions,
+    architecture
   );
   const installedVersion = await dotnetInstaller.installDotnet();
   installer.DotnetCoreInstaller.addToPath();