diff --git a/packages/codemods/src/__test__/integration.test.js b/packages/codemods/src/__test__/integration.test.js
index e7b87151..436a5774 100644
--- a/packages/codemods/src/__test__/integration.test.js
+++ b/packages/codemods/src/__test__/integration.test.js
@@ -1,7 +1,24 @@
-import { it, describe } from 'vitest';
+import { it, describe, expect } from 'vitest';
+import transformer from '../index';
+
+function expectCodemodResult(src, expected) {
+	expect(transformer({ source: src })).toEqual(expected);
+}
 
 describe('integration', () => {
-	it('allow passing in one or more variable names for fetch-mock', () => {});
+	it('allow passing in one or more variable names for fetch-mock', () => {
+		process.env.FM_VARIABLES = 'fm1,fm2';
+		expectCodemodResult(
+			`const fetchMock = require('fetch-mock');
+fetchMock.mock("blah", 200);
+fm1.mock("blah", 200);
+fm2.mock("blah", 200);`,
+			`const fetchMock = require('fetch-mock');
+fetchMock.route("blah", 200);
+fm1.route("blah", 200);
+fm2.route("blah", 200);`,
+		);
+	});
 	it('can operate on a js file', () => {});
 	it('can operate on a ts file', () => {});
 	it('can operate on a jsx file', () => {});
diff --git a/packages/codemods/src/__test__/method-codemods.test.js b/packages/codemods/src/__test__/method-codemods.test.js
index 44c4e282..9d099c76 100644
--- a/packages/codemods/src/__test__/method-codemods.test.js
+++ b/packages/codemods/src/__test__/method-codemods.test.js
@@ -1,6 +1,5 @@
 import { describe, it, expect } from 'vitest';
 import { codemod } from '../index';
-import jscodeshift from 'jscodeshift';
 
 const prependFetchMock = (src, fetchMockVariableName) =>
 	`const ${fetchMockVariableName} = require('fetch-mock');\n${src}`;
@@ -10,9 +9,9 @@ function expectCodemodResult(
 	expected,
 	fetchMockVariableName = 'fetchMock',
 ) {
-	expect(
-		codemod(prependFetchMock(src, fetchMockVariableName), jscodeshift),
-	).toEqual(prependFetchMock(expected, fetchMockVariableName));
+	expect(codemod(prependFetchMock(src, fetchMockVariableName))).toEqual(
+		prependFetchMock(expected, fetchMockVariableName),
+	);
 }
 
 describe('codemods operating on methods', () => {
diff --git a/packages/codemods/src/__test__/option-codemods.test.js b/packages/codemods/src/__test__/option-codemods.test.js
index a9dbb29f..eeba1305 100644
--- a/packages/codemods/src/__test__/option-codemods.test.js
+++ b/packages/codemods/src/__test__/option-codemods.test.js
@@ -1,14 +1,11 @@
 import { describe, it, expect } from 'vitest';
 import { codemod } from '../index';
-import jscodeshift from 'jscodeshift';
 
 const prependFetchMock = (src) =>
 	`const fetchMock = require('fetch-mock');${src ? '\n' : ''}${src}`;
 
 function expectCodemodResult(src, expected) {
-	expect(codemod(prependFetchMock(src), jscodeshift)).toEqual(
-		prependFetchMock(expected),
-	);
+	expect(codemod(prependFetchMock(src))).toEqual(prependFetchMock(expected));
 }
 
 describe('codemods operating on options', () => {
diff --git a/packages/codemods/src/index.js b/packages/codemods/src/index.js
index f5c5027c..6797f6c7 100644
--- a/packages/codemods/src/index.js
+++ b/packages/codemods/src/index.js
@@ -29,9 +29,9 @@ function findFetchMockVariableName(root) {
 	return fetchMockVariableName;
 }
 
-export function codemod(source) {
+export function codemod(source, variableName) {
 	const root = j(source);
-	const fetchMockVariableName = findFetchMockVariableName(root);
+	const fetchMockVariableName = variableName || findFetchMockVariableName(root);
 	simpleMethods(fetchMockVariableName, root);
 	// run after simpleMethods because means the options rewriters have to iterate
 	// over smaller list of methods
@@ -41,5 +41,12 @@ export function codemod(source) {
 }
 
 export default function transformer(file) {
-	return codemod(file.source);
+	let modifiedSource = codemod(file.source);
+	if (process.env.FM_VARIABLES) {
+		const extraVariables = process.env.FM_VARIABLES.split(',');
+		extraVariables.forEach((variableName) => {
+			modifiedSource = codemod(modifiedSource, variableName);
+		});
+	}
+	return modifiedSource;
 }