diff --git a/packages/jest-editor-support/src/Process.js b/packages/jest-editor-support/src/Process.js
index 541bf1a23a35..ca34b15245f5 100644
--- a/packages/jest-editor-support/src/Process.js
+++ b/packages/jest-editor-support/src/Process.js
@@ -19,7 +19,7 @@ const ProjectWorkspace = require('./ProjectWorkspace');
  * @param {string[]} args
  * @returns {ChildProcess}
  */
-module.exports.jestChildProcessWithArgs = (
+module.exports.createProcess = (
   workspace: ProjectWorkspace, args: Array<string>,
 ): ChildProcess => {
 
diff --git a/packages/jest-editor-support/src/ProjectWorkspace.js b/packages/jest-editor-support/src/ProjectWorkspace.js
index 929a2cc96c3c..884436da7ba7 100644
--- a/packages/jest-editor-support/src/ProjectWorkspace.js
+++ b/packages/jest-editor-support/src/ProjectWorkspace.js
@@ -37,7 +37,7 @@ module.exports = class ProjectWorkspace {
 
   /**
    * Path to a local Jest config file.
-   * 
+   *
    * @type {string}
    */
   pathToConfig: string;
@@ -45,14 +45,14 @@ module.exports = class ProjectWorkspace {
   /**
    * local Jest major release version, as the runner could run against
    * any version of Jest.
-   * 
+   *
    * @type {number}
    */
   localJestMajorVersion: number;
 
   constructor(
-    rootPath: string, 
-    pathToJest: string, 
+    rootPath: string,
+    pathToJest: string,
     pathToConfig: string,
     localJestMajorVersion: number,
   ) {
diff --git a/packages/jest-editor-support/src/Runner.js b/packages/jest-editor-support/src/Runner.js
index 9e86d64b1365..3800e601ac75 100644
--- a/packages/jest-editor-support/src/Runner.js
+++ b/packages/jest-editor-support/src/Runner.js
@@ -15,18 +15,25 @@ const {readFile} = require('fs');
 const {tmpdir} = require('os');
 const {EventEmitter} = require('events');
 const ProjectWorkspace = require('./ProjectWorkspace');
-const {jestChildProcessWithArgs} = require('./Process');
+const {createProcess} = require('./Process');
+
+import type {Options} from './types';
 
 // This class represents the running process, and
 // passes out events when it understands what data is being
 // pass sent out of the process
 module.exports = class Runner extends EventEmitter {
   debugprocess: ChildProcess;
-  workspace: ProjectWorkspace;
   outputPath: string;
+  workspace: ProjectWorkspace;
+  _createProcess: (
+    workspace: ProjectWorkspace,
+    args: Array<string>,
+  ) => ChildProcess;
 
-  constructor(workspace: ProjectWorkspace) {
+  constructor(workspace: ProjectWorkspace, options?: Options) {
     super();
+    this._createProcess = (options && options.createProcess) || createProcess;
     this.workspace = workspace;
     this.outputPath = tmpdir() + '/jest_runner.json';
   }
@@ -47,7 +54,7 @@ module.exports = class Runner extends EventEmitter {
       this.outputPath,
     ];
 
-    this.debugprocess = jestChildProcessWithArgs(this.workspace, args);
+    this.debugprocess = this._createProcess(this.workspace, args);
     this.debugprocess.stdout.on('data', (data: Buffer) => {
       // Make jest save to a file, otherwise we get chunked data
       // and it can be hard to put it back together.
@@ -85,7 +92,7 @@ module.exports = class Runner extends EventEmitter {
 
   runJestWithUpdateForSnapshots(completion: any) {
     const args = ['--updateSnapshot'];
-    const updateProcess = jestChildProcessWithArgs(this.workspace, args);
+    const updateProcess = this._createProcess(this.workspace, args);
     updateProcess.on('close', () => {
       completion();
     });
diff --git a/packages/jest-editor-support/src/Settings.js b/packages/jest-editor-support/src/Settings.js
index cf4089b0d0d1..37cd3b3c1d31 100644
--- a/packages/jest-editor-support/src/Settings.js
+++ b/packages/jest-editor-support/src/Settings.js
@@ -14,7 +14,7 @@ const {ChildProcess} = require('child_process');
 const EventEmitter = require('events');
 const {EOL} = require('os');
 const ProjectWorkspace = require('./ProjectWorkspace');
-const {jestChildProcessWithArgs} = require('./Process');
+const {createProcess} = require('./Process');
 
 // This class represents the the configuration of Jest's process
 // we want to start with the defaults then override whatever they output
@@ -33,17 +33,22 @@ type ConfigRepresentation = {
   testRegex: string,
   testMatch: Array<Glob>
 }
+import type {Options} from './types';
 
 module.exports = class Settings extends EventEmitter {
   debugprocess: ChildProcess;
-  workspace: ProjectWorkspace;
-
-  settings: ConfigRepresentation;
   jestVersionMajor: number | null;
+  _createProcess: (
+    workspace: ProjectWorkspace,
+    args: Array<string>,
+  ) => ChildProcess;
+  settings: ConfigRepresentation;
+  workspace: ProjectWorkspace;
 
-  constructor(workspace: ProjectWorkspace) {
+  constructor(workspace: ProjectWorkspace, options?: Options) {
     super();
     this.workspace = workspace;
+    this._createProcess = (options && options.createProcess) || createProcess;
 
     // Defaults for a Jest project
     this.settings = {
@@ -60,12 +65,12 @@ module.exports = class Settings extends EventEmitter {
     // in a non-existant folder.
     const folderThatDoesntExist = 'hi-there-danger-are-you-following-along';
     const args = ['--debug', folderThatDoesntExist];
-    this.debugprocess = jestChildProcessWithArgs(this.workspace, args);
+    this.debugprocess = this._createProcess(this.workspace, args);
 
     this.debugprocess.stdout.on('data', (data: Buffer) => {
       const string = data.toString();
       // We can give warnings to versions under 17 now
-      // See https://github.com/facebook/jest/issues/2343 for moving this into 
+      // See https://github.com/facebook/jest/issues/2343 for moving this into
       // the config object
       if (string.includes('jest version =')) {
         const version = string.split('jest version =')
diff --git a/packages/jest-editor-support/src/__tests__/Runner-test.js b/packages/jest-editor-support/src/__tests__/Runner-test.js
index a601fce410f1..d1fe22cb2329 100644
--- a/packages/jest-editor-support/src/__tests__/Runner-test.js
+++ b/packages/jest-editor-support/src/__tests__/Runner-test.js
@@ -28,10 +28,10 @@ jest.doMock('fs', () => {
 
 // Let's us use a per-test "jest process"
 let mockDebugProcess =  {};
-const mockJestChildProcessWithArgs = jest.fn(() => mockDebugProcess);
-jest.mock('../Process.js', () => {
+const mockCreateProcess = jest.fn(() => mockDebugProcess);
+jest.doMock('../Process.js', () => {
   return {
-    jestChildProcessWithArgs: mockJestChildProcessWithArgs,
+    createProcess: mockCreateProcess,
   };
 });
 
@@ -42,7 +42,7 @@ describe('events', () => {
   let fakeProcess;
 
   beforeEach(() => {
-    mockJestChildProcessWithArgs.mockClear();
+    mockCreateProcess.mockClear();
     const workspace = new ProjectWorkspace('.', 'node_modules/.bin/jest', 18);
     runner = new Runner(workspace);
     fakeProcess = new EventEmitter();
@@ -87,12 +87,12 @@ describe('events', () => {
 
   it('should only start one jest process at a time', () => {
     runner.start();
-    expect(mockJestChildProcessWithArgs).toHaveBeenCalledTimes(1);
+    expect(mockCreateProcess).toHaveBeenCalledTimes(1);
   });
 
   it('should start jest process after killing the old process', () => {
     runner.closeProcess();
     runner.start();
-    expect(mockJestChildProcessWithArgs).toHaveBeenCalledTimes(2);
+    expect(mockCreateProcess).toHaveBeenCalledTimes(2);
   });
 });
diff --git a/packages/jest-editor-support/src/__tests__/parsers/parserTests.js b/packages/jest-editor-support/src/__tests__/parsers/parserTests.js
index d554db6fe827..5a726d5fc190 100644
--- a/packages/jest-editor-support/src/__tests__/parsers/parserTests.js
+++ b/packages/jest-editor-support/src/__tests__/parsers/parserTests.js
@@ -93,8 +93,8 @@ function parserTests(parse: (file: string) => ParserReturn) {
       expect(sixthIt.end).toEqual({column: 5, line: 25});
     });
 
-    // These tests act more like linters that we don't raise on 
-    // non-trivial files taken from some Artsy codebases, 
+    // These tests act more like linters that we don't raise on
+    // non-trivial files taken from some Artsy codebases,
     // which are MIT licensed.
 
     it('For a danger test file (which has flow annotations)', () => {
diff --git a/packages/jest-editor-support/src/parsers/BabylonParser.js b/packages/jest-editor-support/src/parsers/BabylonParser.js
index 9d934e641b6e..b709b690d80e 100644
--- a/packages/jest-editor-support/src/parsers/BabylonParser.js
+++ b/packages/jest-editor-support/src/parsers/BabylonParser.js
@@ -54,6 +54,7 @@ const babylonParser = (file: string) => {
   const plugins = Array.isArray(babel.plugins)
     ? babel.plugins.concat(['flow'])
     : ['flow'];
+
   const config = {plugins, sourceType: 'module'};
   const ast = babylon.parse(data, config);
 
diff --git a/packages/jest-editor-support/src/types.js b/packages/jest-editor-support/src/types.js
index f44b41e24e40..5baafd44596b 100644
--- a/packages/jest-editor-support/src/types.js
+++ b/packages/jest-editor-support/src/types.js
@@ -15,13 +15,23 @@ export type Location = {
   line: number,
 }
 
+import type ProjectWorkspace from './ProjectWorkspace';
+import type {ChildProcess} from 'child_process';
+
+export type Options = {
+  createProcess?: (
+    workspace: ProjectWorkspace,
+    args: Array<string>,
+  ) => ChildProcess
+}
+
 export type JestFileResults = {
   name: string,
   summary: string,
   message: string,
   status: "failed" | "passed",
-  startTime:number,
-  endTime:number,
+  startTime: number,
+  endTime: number,
   assertionResults: Array<JestAssertionResults>,
 }
 
@@ -33,14 +43,14 @@ export type JestAssertionResults = {
 }
 
 export type JestTotalResults = {
-  success:boolean,
-  startTime:number,
-  numTotalTests:number,
-  numTotalTestSuites:number,
-  numRuntimeErrorTestSuites:number,
-  numPassedTests:number,
-  numFailedTests:number,
-  numPendingTests:number,
+  success: boolean,
+  startTime: number,
+  numTotalTests: number,
+  numTotalTestSuites: number,
+  numRuntimeErrorTestSuites: number,
+  numPassedTests: number,
+  numFailedTests: number,
+  numPendingTests: number,
   testResults: Array<JestFileResults>,
 }