diff --git a/__tests__/__snapshots__/authutil.test.ts.snap b/__tests__/__snapshots__/authutil.test.ts.snap
deleted file mode 100644
index 99174a6..0000000
--- a/__tests__/__snapshots__/authutil.test.ts.snap
+++ /dev/null
@@ -1,21 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`installer tests Appends trailing slash to registry 1`] = `
-"//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}
-registry=https://registry.npmjs.org/"
-`;
-
-exports[`installer tests Automatically configures GPR scope 1`] = `
-"npm.pkg.github.com/:_authToken=\${NODE_AUTH_TOKEN}
-@owner:registry=npm.pkg.github.com/"
-`;
-
-exports[`installer tests Configures scoped npm registries 1`] = `
-"//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}
-@myScope:registry=https://registry.npmjs.org/"
-`;
-
-exports[`installer tests Sets up npmrc for npmjs 1`] = `
-"//registry.npmjs.org/:_authToken=\${NODE_AUTH_TOKEN}
-registry=https://registry.npmjs.org/"
-`;
diff --git a/__tests__/authutil.test.ts b/__tests__/authutil.test.ts
deleted file mode 100644
index 3dab907..0000000
--- a/__tests__/authutil.test.ts
+++ /dev/null
@@ -1,62 +0,0 @@
-import io = require('@actions/io');
-import fs = require('fs');
-import path = require('path');
-
-const tempDir = path.join(
-  __dirname,
-  'runner',
-  path.join(
-    Math.random()
-      .toString(36)
-      .substring(7)
-  ),
-  'temp'
-);
-
-const rcFile = path.join(tempDir, '.npmrc');
-
-process.env['GITHUB_REPOSITORY'] = 'owner/repo';
-process.env['RUNNER_TEMP'] = tempDir;
-import * as auth from '../src/authutil';
-
-describe('installer tests', () => {
-  beforeAll(async () => {
-    await io.rmRF(tempDir);
-    await io.mkdirP(tempDir);
-  }, 100000);
-
-  beforeEach(() => {
-    if (fs.existsSync(rcFile)) {
-      fs.unlinkSync(rcFile);
-    }
-    process.env['INPUT_SCOPE'] = '';
-  });
-
-  it('Sets up npmrc for npmjs', async () => {
-    await auth.configAuthentication('https://registry.npmjs.org/');
-    expect(fs.existsSync(rcFile)).toBe(true);
-    expect(fs.readFileSync(rcFile, {encoding: 'utf8'})).toMatchSnapshot();
-  });
-
-  it('Appends trailing slash to registry', async () => {
-    await auth.configAuthentication('https://registry.npmjs.org');
-
-    expect(fs.existsSync(rcFile)).toBe(true);
-    expect(fs.readFileSync(rcFile, {encoding: 'utf8'})).toMatchSnapshot();
-  });
-
-  it('Configures scoped npm registries', async () => {
-    process.env['INPUT_SCOPE'] = 'myScope';
-    await auth.configAuthentication('https://registry.npmjs.org');
-
-    expect(fs.existsSync(rcFile)).toBe(true);
-    expect(fs.readFileSync(rcFile, {encoding: 'utf8'})).toMatchSnapshot();
-  });
-
-  it('Automatically configures GPR scope', async () => {
-    await auth.configAuthentication('npm.pkg.github.com');
-
-    expect(fs.existsSync(rcFile)).toBe(true);
-    expect(fs.readFileSync(rcFile, {encoding: 'utf8'})).toMatchSnapshot();
-  });
-});
diff --git a/__tests__/installer.test.ts b/__tests__/installer.test.ts
index e0ada32..e2aa653 100644
--- a/__tests__/installer.test.ts
+++ b/__tests__/installer.test.ts
@@ -4,7 +4,7 @@ import os = require('os');
 import path = require('path');
 
 const toolDir = path.join(
-  __dirname,
+  process.cwd(),
   'runner',
   path.join(
     Math.random()
@@ -14,7 +14,7 @@ const toolDir = path.join(
   'tools'
 );
 const tempDir = path.join(
-  __dirname,
+  process.cwd(),
   'runner',
   path.join(
     Math.random()
@@ -36,6 +36,15 @@ describe('installer tests', () => {
     await io.rmRF(tempDir);
   }, 100000);
 
+  afterAll(async () => {
+    try {
+      await io.rmRF(toolDir);
+      await io.rmRF(tempDir);
+    } catch {
+      console.log('Failed to remove test directories');
+    }
+  }, 100000);
+
   it('Acquires version of node if no matching version is installed', async () => {
     await installer.getNode('10.16.0');
     const nodeDir = path.join(toolDir, 'node', '10.16.0', os.arch());
diff --git a/lib/authutil.js b/lib/authutil.js
index b9fe8cb..c45f351 100644
--- a/lib/authutil.js
+++ b/lib/authutil.js
@@ -13,10 +13,11 @@ const path = __importStar(require("path"));
 const core = __importStar(require("@actions/core"));
 const github = __importStar(require("@actions/github"));
 function configAuthentication(registryUrl) {
-    const npmrc = path.resolve(process.env['RUNNER_TEMP'] || process.cwd(), '.npmrc');
-    if (!registryUrl.endsWith('/')) {
-        registryUrl += '/';
-    }
+    // const npmrc: string = path.resolve(
+    //   process.env['RUNNER_TEMP'] || process.cwd(),
+    //   '.npmrc'
+    // );
+    const npmrc = path.resolve(process.cwd(), '.npmrc');
     writeRegistryToFile(registryUrl, npmrc);
 }
 exports.configAuthentication = configAuthentication;
@@ -30,15 +31,23 @@ function writeRegistryToFile(registryUrl, fileLocation) {
     }
     core.debug(`Setting auth in ${fileLocation}`);
     let newContents = '';
-    
+    if (fs.existsSync(fileLocation)) {
+        const curContents = fs.readFileSync(fileLocation, 'utf8');
+        curContents.split(os.EOL).forEach((line) => {
+            // Add current contents unless they are setting the registry
+            if (!line.toLowerCase().startsWith('registry')) {
+                newContents += line + os.EOL;
+            }
+        });
+    }
     // Remove http: or https: from front of registry.
     const authString = registryUrl.replace(/(^\w+:|^)/, '') + ':_authToken=${NODE_AUTH_TOKEN}';
     const registryString = scope
         ? `${scope}:registry=${registryUrl}`
         : `registry=${registryUrl}`;
-    newContents += `${authString}${os.EOL}${registryString}`;
+    newContents += `${registryString}${os.EOL}${authString}`;
     fs.writeFileSync(fileLocation, newContents);
     core.exportVariable('NPM_CONFIG_USERCONFIG', fileLocation);
     // Export empty node_auth_token so npm doesn't complain about not being able to find it
-    core.exportVariable('NODE_AUTH_TOKEN', 'XXXXX-XXXXX-XXXXX-XXXXX');
+    // core.exportVariable('NODE_AUTH_TOKEN', 'XXXXX-XXXXX-XXXXX-XXXXX');
 }
diff --git a/src/authutil.ts b/src/authutil.ts
index 9285bb9..d95c2fe 100644
--- a/src/authutil.ts
+++ b/src/authutil.ts
@@ -5,13 +5,11 @@ import * as core from '@actions/core';
 import * as github from '@actions/github';
 
 export function configAuthentication(registryUrl: string) {
-  const npmrc: string = path.resolve(
-    process.env['RUNNER_TEMP'] || process.cwd(),
-    '.npmrc'
-  );
-  if (!registryUrl.endsWith('/')) {
-    registryUrl += '/';
-  }
+  // const npmrc: string = path.resolve(
+  //   process.env['RUNNER_TEMP'] || process.cwd(),
+  //   '.npmrc'
+  // );
+  const npmrc: string = path.resolve(process.cwd(), '.npmrc');
 
   writeRegistryToFile(registryUrl, npmrc);
 }
@@ -38,13 +36,13 @@ function writeRegistryToFile(registryUrl: string, fileLocation: string) {
   }
   // Remove http: or https: from front of registry.
   const authString =
-    registryUrl.replace(/(^\w+:|^)/, '') + ':_authToken=${NODE_AUTH_TOKEN}';
+    registryUrl.replace(/(^\w+:|^)/, '') + `:_authToken=${NODE_AUTH_TOKEN}`;
   const registryString = scope
     ? `${scope}:registry=${registryUrl}`
     : `registry=${registryUrl}`;
-  newContents += `${authString}${os.EOL}${registryString}`;
+  newContents += `${registryString}${os.EOL}${authString}`;
   fs.writeFileSync(fileLocation, newContents);
-  core.exportVariable('NPM_CONFIG_USERCONFIG', fileLocation);
+//   core.exportVariable('NPM_CONFIG_USERCONFIG', fileLocation);
   // Export empty node_auth_token so npm doesn't complain about not being able to find it
-  core.exportVariable('NODE_AUTH_TOKEN', 'XXXXX-XXXXX-XXXXX-XXXXX');
+  // core.exportVariable('NODE_AUTH_TOKEN', 'XXXXX-XXXXX-XXXXX-XXXXX');
 }