diff --git a/src/api/viya/spec/getFileStream.spec.ts b/src/api/viya/spec/getFileStream.spec.ts
new file mode 100644
index 0000000..0722e37
--- /dev/null
+++ b/src/api/viya/spec/getFileStream.spec.ts
@@ -0,0 +1,41 @@
+import { Logger, LogLevel } from '@sasjs/utils/logger'
+import * as path from 'path'
+import * as fileModule from '@sasjs/utils/file'
+import { getFileStream } from '../getFileStream'
+import { mockJob } from './mockResponses'
+import { WriteStream } from '../../../types'
+
+describe('getFileStream', () => {
+  beforeEach(() => {
+    ;(process as any).logger = new Logger(LogLevel.Off)
+    setupMocks()
+  })
+  it('should use the given log path if it points to a file', async () => {
+    const { createWriteStream } = require('@sasjs/utils/file')
+
+    await getFileStream(mockJob, path.join(__dirname, 'test.log'))
+
+    expect(createWriteStream).toHaveBeenCalledWith(
+      path.join(__dirname, 'test.log')
+    )
+  })
+
+  it('should generate a log file path with a timestamp if it points to a folder', async () => {
+    const { createWriteStream } = require('@sasjs/utils/file')
+
+    await getFileStream(mockJob, __dirname)
+
+    expect(createWriteStream).not.toHaveBeenCalledWith(__dirname)
+    expect(createWriteStream).toHaveBeenCalledWith(
+      expect.stringContaining(__dirname + '/test job-20')
+    )
+  })
+})
+
+const setupMocks = () => {
+  jest.restoreAllMocks()
+  jest.mock('@sasjs/utils/file/file')
+  jest
+    .spyOn(fileModule, 'createWriteStream')
+    .mockImplementation(() => Promise.resolve({} as unknown as WriteStream))
+}
diff --git a/src/api/viya/spec/pollJobState.spec.ts b/src/api/viya/spec/pollJobState.spec.ts
index 7855f57..aba468c 100644
--- a/src/api/viya/spec/pollJobState.spec.ts
+++ b/src/api/viya/spec/pollJobState.spec.ts
@@ -1,11 +1,11 @@
 import { Logger, LogLevel } from '@sasjs/utils'
-import * as path from 'path'
-import * as fileModule from '@sasjs/utils/file'
 import { RequestClient } from '../../../request/RequestClient'
 import { mockAuthConfig, mockJob } from './mockResponses'
 import { pollJobState } from '../pollJobState'
 import * as getTokensModule from '../../../auth/getTokens'
 import * as saveLogModule from '../saveLog'
+import * as getFileStreamModule from '../getFileStream'
+import * as isNodeModule from '../../../utils/isNode'
 import { PollOptions } from '../../../types'
 import { WriteStream } from 'fs'
 
@@ -77,42 +77,43 @@ describe('pollJobState', () => {
 
   it('should attempt to fetch and save the log after each poll when streamLog is true', async () => {
     mockSimplePoll()
+    const { saveLog } = require('../saveLog')
 
     await pollJobState(requestClient, mockJob, false, mockAuthConfig, {
       ...defaultPollOptions,
       streamLog: true
     })
 
-    expect(saveLogModule.saveLog).toHaveBeenCalledTimes(2)
+    expect(saveLog).toHaveBeenCalledTimes(2)
   })
 
-  it('should use the given log path if it points to a file', async () => {
+  it('should create a write stream in Node.js environment when streamLog is true', async () => {
     mockSimplePoll()
+    const { getFileStream } = require('../getFileStream')
+    const { saveLog } = require('../saveLog')
 
     await pollJobState(requestClient, mockJob, false, mockAuthConfig, {
       ...defaultPollOptions,
-      streamLog: true,
-      logFolderPath: path.join(__dirname, 'test.log')
+      streamLog: true
     })
 
-    expect(fileModule.createWriteStream).toHaveBeenCalledWith(
-      path.join(__dirname, 'test.log')
-    )
+    expect(getFileStream).toHaveBeenCalled()
+    expect(saveLog).toHaveBeenCalledTimes(2)
   })
 
-  it('should generate a log file path with a timestamp if it points to a folder', async () => {
+  it('should not create a write stream in a non-Node.js environment', async () => {
     mockSimplePoll()
+    jest.spyOn(isNodeModule, 'isNode').mockImplementation(() => false)
+    const { saveLog } = require('../saveLog')
+    const { getFileStream } = require('../getFileStream')
 
     await pollJobState(requestClient, mockJob, false, mockAuthConfig, {
       ...defaultPollOptions,
-      streamLog: true,
-      logFolderPath: path.join(__dirname)
+      streamLog: true
     })
 
-    expect(fileModule.createWriteStream).not.toHaveBeenCalledWith(__dirname)
-    expect(fileModule.createWriteStream).toHaveBeenCalledWith(
-      expect.stringContaining(__dirname + '/test job-20')
-    )
+    expect(getFileStream).not.toHaveBeenCalled()
+    expect(saveLog).not.toHaveBeenCalled()
   })
 
   it('should not attempt to fetch and save the log after each poll when streamLog is false', async () => {
@@ -247,7 +248,8 @@ const setupMocks = () => {
   jest.mock('../../../request/RequestClient')
   jest.mock('../../../auth/getTokens')
   jest.mock('../saveLog')
-  jest.mock('@sasjs/utils/file')
+  jest.mock('../getFileStream')
+  jest.mock('../../../utils/isNode')
 
   jest
     .spyOn(requestClient, 'get')
@@ -261,8 +263,9 @@ const setupMocks = () => {
     .spyOn(saveLogModule, 'saveLog')
     .mockImplementation(() => Promise.resolve())
   jest
-    .spyOn(fileModule, 'createWriteStream')
+    .spyOn(getFileStreamModule, 'getFileStream')
     .mockImplementation(() => Promise.resolve({} as unknown as WriteStream))
+  jest.spyOn(isNodeModule, 'isNode').mockImplementation(() => true)
 }
 
 const mockSimplePoll = (runningCount = 2) => {
diff --git a/src/api/viya/spec/saveLog.spec.ts b/src/api/viya/spec/saveLog.spec.ts
index a6c662b..261438e 100644
--- a/src/api/viya/spec/saveLog.spec.ts
+++ b/src/api/viya/spec/saveLog.spec.ts
@@ -4,7 +4,7 @@ import * as fetchLogsModule from '../../../utils/fetchLogByChunks'
 import * as writeStreamModule from '../writeStream'
 import { saveLog } from '../saveLog'
 import { mockJob } from './mockResponses'
-import { WriteStream } from 'fs'
+import { WriteStream } from '../../../types'
 
 const requestClient = new (<jest.Mock<RequestClient>>RequestClient)()
 const stream = {} as unknown as WriteStream
diff --git a/src/api/viya/spec/writeStream.spec.ts b/src/api/viya/spec/writeStream.spec.ts
new file mode 100644
index 0000000..358c82a
--- /dev/null
+++ b/src/api/viya/spec/writeStream.spec.ts
@@ -0,0 +1,25 @@
+import { WriteStream } from '../../../types'
+import { writeStream } from '../writeStream'
+import 'jest-extended'
+
+describe('writeStream', () => {
+  const stream: WriteStream = {
+    write: jest.fn(),
+    path: 'test'
+  }
+
+  it('should resolve when the stream is written successfully', async () => {
+    expect(writeStream(stream, 'test')).toResolve()
+
+    expect(stream.write).toHaveBeenCalledWith('test\n', expect.anything())
+  })
+
+  it('should reject when the write errors out', async () => {
+    jest
+      .spyOn(stream, 'write')
+      .mockImplementation((_, callback) => callback(new Error('Test Error')))
+    const error = await writeStream(stream, 'test').catch((e) => e)
+
+    expect(error.message).toEqual('Test Error')
+  })
+})