diff --git a/exercises/01.expressions-and-output/02.solution.escaping-strings/index.test.ts b/exercises/01.expressions-and-output/02.solution.escaping-strings/index.test.ts
index 57ae972..282af43 100644
--- a/exercises/01.expressions-and-output/02.solution.escaping-strings/index.test.ts
+++ b/exercises/01.expressions-and-output/02.solution.escaping-strings/index.test.ts
@@ -1,24 +1,9 @@
 import assert from 'node:assert/strict'
-import { spawnSync } from 'node:child_process'
 import { test } from 'node:test'
 
-function getOutput() {
-	const result = spawnSync('npm', ['start', '--silent'], { encoding: 'utf8' })
+import { getNpmStartOutput } from '../run-npm-start.ts'
 
-	if (result.error) {
-		throw result.error
-	}
-
-	assert.strictEqual(
-		result.status,
-		0,
-		result.stderr || '🚨 Running the program failed',
-	)
-
-	return result.stdout.replace(/\r\n/g, '\n')
-}
-
-const output = getOutput()
+const output = getNpmStartOutput()
 
 await test('should print apostrophe string', () => {
 	assert.ok(
diff --git a/exercises/01.expressions-and-output/03.solution.strings/index.test.ts b/exercises/01.expressions-and-output/03.solution.strings/index.test.ts
index 77d60af..b6dd408 100644
--- a/exercises/01.expressions-and-output/03.solution.strings/index.test.ts
+++ b/exercises/01.expressions-and-output/03.solution.strings/index.test.ts
@@ -1,25 +1,10 @@
 import assert from 'node:assert/strict'
-import { spawnSync } from 'node:child_process'
 import { readFileSync } from 'node:fs'
 import { test } from 'node:test'
 
-function getOutput() {
-	const result = spawnSync('npm', ['start', '--silent'], { encoding: 'utf8' })
+import { getNpmStartOutput } from '../run-npm-start.ts'
 
-	if (result.error) {
-		throw result.error
-	}
-
-	assert.strictEqual(
-		result.status,
-		0,
-		result.stderr || '🚨 Running the program failed',
-	)
-
-	return result.stdout.replace(/\r\n/g, '\n')
-}
-
-const output = getOutput()
+const output = getNpmStartOutput()
 
 await test('should print Hello TypeScript', () => {
 	assert.ok(
diff --git a/exercises/01.expressions-and-output/04.solution.numbers/index.test.ts b/exercises/01.expressions-and-output/04.solution.numbers/index.test.ts
index fd271b9..e8888f8 100644
--- a/exercises/01.expressions-and-output/04.solution.numbers/index.test.ts
+++ b/exercises/01.expressions-and-output/04.solution.numbers/index.test.ts
@@ -1,24 +1,9 @@
 import assert from 'node:assert/strict'
-import { spawnSync } from 'node:child_process'
 import { test } from 'node:test'
 
-function getOutput() {
-	const result = spawnSync('npm', ['start', '--silent'], { encoding: 'utf8' })
+import { getNpmStartOutput } from '../run-npm-start.ts'
 
-	if (result.error) {
-		throw result.error
-	}
-
-	assert.strictEqual(
-		result.status,
-		0,
-		result.stderr || '🚨 Running the program failed',
-	)
-
-	return result.stdout.replace(/\r\n/g, '\n')
-}
-
-const output = getOutput()
+const output = getNpmStartOutput()
 const lines = output
 	.split('\n')
 	.map((line) => line.trim())
diff --git a/exercises/01.expressions-and-output/05.solution.template-literals/index.test.ts b/exercises/01.expressions-and-output/05.solution.template-literals/index.test.ts
index 9bbb99c..6edcd30 100644
--- a/exercises/01.expressions-and-output/05.solution.template-literals/index.test.ts
+++ b/exercises/01.expressions-and-output/05.solution.template-literals/index.test.ts
@@ -1,24 +1,9 @@
 import assert from 'node:assert/strict'
-import { spawnSync } from 'node:child_process'
 import { test } from 'node:test'
 
-function getOutput() {
-	const result = spawnSync('npm', ['start', '--silent'], { encoding: 'utf8' })
+import { getNpmStartOutput } from '../run-npm-start.ts'
 
-	if (result.error) {
-		throw result.error
-	}
-
-	assert.strictEqual(
-		result.status,
-		0,
-		result.stderr || '🚨 Running the program failed',
-	)
-
-	return result.stdout.replace(/\r\n/g, '\n')
-}
-
-const output = getOutput()
+const output = getNpmStartOutput()
 
 await test('should print "The answer is 42"', () => {
 	assert.ok(
diff --git a/exercises/01.expressions-and-output/run-npm-start.ts b/exercises/01.expressions-and-output/run-npm-start.ts
new file mode 100644
index 0000000..8a1019b
--- /dev/null
+++ b/exercises/01.expressions-and-output/run-npm-start.ts
@@ -0,0 +1,21 @@
+import assert from 'node:assert/strict'
+import { spawnSync } from 'node:child_process'
+
+export function getNpmStartOutput() {
+	const result = spawnSync('npm', ['start', '--silent'], {
+		encoding: 'utf8',
+		shell: true,
+	})
+
+	if (result.error) {
+		throw result.error
+	}
+
+	assert.strictEqual(
+		result.status,
+		0,
+		result.stderr || '🚨 Running the program failed',
+	)
+
+	return result.stdout.replace(/\r\n/g, '\n')
+}