diff --git a/__tests__/setup-go.test.ts b/__tests__/setup-go.test.ts
index 3d3e150..d81a2aa 100644
--- a/__tests__/setup-go.test.ts
+++ b/__tests__/setup-go.test.ts
@@ -1,13 +1,12 @@
-import * as tc from '@actions/tool-cache';
 import * as core from '@actions/core';
-import fs = require('fs');
+import * as io from '@actions/io';
+import * as tc from '@actions/tool-cache';
+import fs from 'fs';
+import cp from 'child_process';
 import osm = require('os');
-import path = require('path');
-import {run} from '../src/main';
-import * as httpm from '@actions/http-client';
+import path from 'path';
+import * as main from '../src/main';
 import * as im from '../src/installer';
-import * as sys from '../src/system';
-import {ITypedResponse} from '@actions/http-client/interfaces';
 
 let goJsonData = require('./data/golang-dl.json');
 
@@ -25,6 +24,11 @@ describe('setup-go', () => {
   let dlSpy: jest.SpyInstance;
   let exSpy: jest.SpyInstance;
   let cacheSpy: jest.SpyInstance;
+  let dbgSpy: jest.SpyInstance;
+  let whichSpy: jest.SpyInstance;
+  let existsSpy: jest.SpyInstance;
+  let mkdirpSpy: jest.SpyInstance;
+  let execSpy: jest.SpyInstance;
 
   beforeEach(() => {
     // @actions/core
@@ -32,12 +36,13 @@ describe('setup-go', () => {
     inSpy = jest.spyOn(core, 'getInput');
     inSpy.mockImplementation(name => inputs[name]);
 
-    // node 'os'
+    // node
     os = {};
     platSpy = jest.spyOn(osm, 'platform');
     platSpy.mockImplementation(() => os['platform']);
     archSpy = jest.spyOn(osm, 'arch');
     archSpy.mockImplementation(() => os['arch']);
+    execSpy = jest.spyOn(cp, 'execSync');
 
     // @actions/tool-cache
     findSpy = jest.spyOn(tc, 'find');
@@ -46,9 +51,15 @@ describe('setup-go', () => {
     cacheSpy = jest.spyOn(tc, 'cacheDir');
     getSpy = jest.spyOn(im, 'getVersions');
 
+    // io
+    whichSpy = jest.spyOn(io, 'which');
+    existsSpy = jest.spyOn(fs, 'existsSync');
+    mkdirpSpy = jest.spyOn(io, 'mkdirP');
+
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
     logSpy = jest.spyOn(console, 'log');
+    dbgSpy = jest.spyOn(main, '_debug');
     getSpy.mockImplementation(() => <im.IGoVersion[]>goJsonData);
     cnSpy.mockImplementation(line => {
       // uncomment to debug
@@ -58,11 +69,16 @@ describe('setup-go', () => {
       // uncomment to debug
       // process.stderr.write('log:' + line + '\n');
     });
+    dbgSpy.mockImplementation(msg => {
+      // uncomment to see debug output
+      // process.stderr.write(msg + '\n');
+    });
   });
 
   afterEach(() => {
     jest.resetAllMocks();
     jest.clearAllMocks();
+    //jest.restoreAllMocks();
   });
 
   afterAll(async () => {}, 100000);
@@ -164,7 +180,7 @@ describe('setup-go', () => {
 
     let toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
-    await run();
+    await main.run();
 
     expect(logSpy).toHaveBeenCalledWith(`Setup go stable version spec 1.13.0`);
   });
@@ -176,7 +192,7 @@ describe('setup-go', () => {
 
     let toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
-    await run();
+    await main.run();
 
     expect(logSpy).toHaveBeenCalledWith(`Setup go stable version spec 1.13.0`);
   });
@@ -186,7 +202,7 @@ describe('setup-go', () => {
 
     let toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
-    await run();
+    await main.run();
 
     let expPath = path.join(toolPath, 'bin');
   });
@@ -195,7 +211,7 @@ describe('setup-go', () => {
     inputs['go-version'] = '1.13.0';
     let toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
-    await run();
+    await main.run();
 
     let expPath = path.join(toolPath, 'bin');
     expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
@@ -208,7 +224,7 @@ describe('setup-go', () => {
     findSpy.mockImplementation(() => {
       throw new Error(errMsg);
     });
-    await run();
+    await main.run();
     expect(cnSpy).toHaveBeenCalledWith('::error::' + errMsg + osm.EOL);
   });
 
@@ -223,7 +239,7 @@ describe('setup-go', () => {
     let toolPath = path.normalize('/cache/go/1.13.0/x64');
     exSpy.mockImplementation(() => '/some/other/temp/path');
     cacheSpy.mockImplementation(() => toolPath);
-    await run();
+    await main.run();
 
     let expPath = path.join(toolPath, 'bin');
 
@@ -239,7 +255,7 @@ describe('setup-go', () => {
     inputs['go-version'] = '9.99.9';
 
     findSpy.mockImplementation(() => '');
-    await run();
+    await main.run();
 
     expect(cnSpy).toHaveBeenCalledWith(
       `::error::Could not find a version that satisfied version spec: 9.99.9${osm.EOL}`
@@ -257,7 +273,7 @@ describe('setup-go', () => {
     dlSpy.mockImplementation(() => {
       throw new Error(errMsg);
     });
-    await run();
+    await main.run();
 
     expect(cnSpy).toHaveBeenCalledWith(
       `::error::Failed to download version 1.13.1: Error: ${errMsg}${osm.EOL}`
@@ -273,13 +289,39 @@ describe('setup-go', () => {
 
     findSpy.mockImplementation(() => '');
     getSpy.mockImplementation(() => null);
-    await run();
+    await main.run();
 
     expect(cnSpy).toHaveBeenCalledWith(
       `::error::Failed to download version 1.13.1: Error: golang download url did not return results${osm.EOL}`
     );
   });
 
+  it('does not add BIN if go is not in path', async () => {
+    whichSpy.mockImplementation(async () => {
+      return '';
+    });
+    let added = await main.addBinToPath();
+    expect(added).toBeFalsy();
+  });
+
+  it('adds bin if dir not exists', async () => {
+    whichSpy.mockImplementation(async () => {
+      return '/usr/local/go/bin/go';
+    });
+
+    execSpy.mockImplementation(() => {
+      return '/Users/testuser/go';
+    });
+
+    mkdirpSpy.mockImplementation(async () => {});
+    existsSpy.mockImplementation(path => {
+      return false;
+    });
+
+    let added = await main.addBinToPath();
+    expect(added).toBeTruthy;
+  });
+
   // 1.13.1 => 1.13.1
   // 1.13 => 1.13.0
   // 1.10beta1 => 1.10.0-beta1, 1.10rc1 => 1.10.0-rc1
diff --git a/dist/index.js b/dist/index.js
index a3c5e3e..7b347bd 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1274,14 +1274,17 @@ var __importStar = (this && this.__importStar) || function (mod) {
     result["default"] = mod;
     return result;
 };
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(__webpack_require__(470));
 const io = __importStar(__webpack_require__(1));
 const tc = __importStar(__webpack_require__(533));
 const installer = __importStar(__webpack_require__(749));
-const path = __importStar(__webpack_require__(622));
-const cp = __importStar(__webpack_require__(129));
-const fs = __importStar(__webpack_require__(747));
+const path_1 = __importDefault(__webpack_require__(622));
+const child_process_1 = __importDefault(__webpack_require__(129));
+const fs_1 = __importDefault(__webpack_require__(747));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
@@ -1303,7 +1306,7 @@ function run() {
                 }
                 if (installDir) {
                     core.exportVariable('GOROOT', installDir);
-                    core.addPath(path.join(installDir, 'bin'));
+                    core.addPath(path_1.default.join(installDir, 'bin'));
                     console.log('Added go to the path');
                     let added = addBinToPath();
                     core.debug(`add bin ${added}`);
@@ -1313,7 +1316,7 @@ function run() {
                 }
             }
             // add problem matchers
-            const matchersPath = path.join(__dirname, '..', 'matchers.json');
+            const matchersPath = path_1.default.join(__dirname, '..', 'matchers.json');
             console.log(`##[add-matcher]${matchersPath}`);
         }
         catch (error) {
@@ -1326,23 +1329,23 @@ function addBinToPath() {
     return __awaiter(this, void 0, void 0, function* () {
         let added = false;
         let g = yield io.which('go');
-        core.debug(`which go :${g}:`);
+        _debug(`which go :${g}:`);
         if (!g) {
-            core.debug('go not in the path');
+            _debug('go not in the path');
             return added;
         }
-        let buf = cp.execSync('go env GOPATH');
+        let buf = child_process_1.default.execSync('go env GOPATH');
         if (buf) {
             let gp = buf.toString().trim();
-            core.debug(`go env GOPATH :${gp}:`);
-            if (!fs.existsSync(gp)) {
+            _debug(`go env GOPATH :${gp}:`);
+            if (!fs_1.default.existsSync(gp)) {
                 // some of the hosted images have go install but not profile dir
-                core.debug(`creating ${gp}`);
+                _debug(`creating ${gp}`);
                 io.mkdirP(gp);
             }
-            let bp = path.join(gp, 'bin');
-            if (!fs.existsSync(bp)) {
-                core.debug(`creating ${bp}`);
+            let bp = path_1.default.join(gp, 'bin');
+            if (!fs_1.default.existsSync(bp)) {
+                _debug(`creating ${bp}`);
                 io.mkdirP(bp);
             }
             core.addPath(bp);
@@ -1351,6 +1354,11 @@ function addBinToPath() {
         return added;
     });
 }
+exports.addBinToPath = addBinToPath;
+function _debug(message) {
+    core.debug(message);
+}
+exports._debug = _debug;
 
 
 /***/ }),
diff --git a/src/main.ts b/src/main.ts
index 46f9019..9948f98 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -2,9 +2,9 @@ import * as core from '@actions/core';
 import * as io from '@actions/io';
 import * as tc from '@actions/tool-cache';
 import * as installer from './installer';
-import * as path from 'path';
-import * as cp from 'child_process';
-import * as fs from 'fs';
+import path from 'path';
+import cp from 'child_process';
+import fs from 'fs';
 
 export async function run() {
   try {
@@ -55,28 +55,28 @@ export async function run() {
   }
 }
 
-async function addBinToPath(): Promise<boolean> {
+export async function addBinToPath(): Promise<boolean> {
   let added = false;
   let g = await io.which('go');
-  core.debug(`which go :${g}:`);
+  _debug(`which go :${g}:`);
   if (!g) {
-    core.debug('go not in the path');
+    _debug('go not in the path');
     return added;
   }
 
   let buf = cp.execSync('go env GOPATH');
   if (buf) {
     let gp = buf.toString().trim();
-    core.debug(`go env GOPATH :${gp}:`);
+    _debug(`go env GOPATH :${gp}:`);
     if (!fs.existsSync(gp)) {
       // some of the hosted images have go install but not profile dir
-      core.debug(`creating ${gp}`);
+      _debug(`creating ${gp}`);
       io.mkdirP(gp);
     }
 
     let bp = path.join(gp, 'bin');
     if (!fs.existsSync(bp)) {
-      core.debug(`creating ${bp}`);
+      _debug(`creating ${bp}`);
       io.mkdirP(bp);
     }
 
@@ -85,3 +85,7 @@ async function addBinToPath(): Promise<boolean> {
   }
   return added;
 }
+
+export function _debug(message: string) {
+  core.debug(message);
+}