diff --git a/test/integration.js b/test/integration.js
index 4986566..c2a00e2 100644
--- a/test/integration.js
+++ b/test/integration.js
@@ -34,21 +34,21 @@ describe('duel', () => {
     await rmDist(plainDist)
   })
 
-  it.skip('prints options help', async t => {
+  it('prints options help', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     await duel(['--help'])
     assert.ok(spy.mock.calls[1].arguments[0].startsWith('Options:'))
   })
 
-  it.skip('reports errors when passing invalid options', async t => {
+  it('reports errors when passing invalid options', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     await duel(['--invalid'])
     assert.equal(spy.mock.calls[0].arguments[1], "Unknown option '--invalid'")
   })
 
-  it.skip('uses default --project value of "tsconfig.json"', async t => {
+  it('uses default --project value of "tsconfig.json"', async t => {
     const spy = t.mock.method(global.console, 'log')
     const tsConfigPath = resolve('./tsconfig.json')
     const tsConfigPathTemp = tsConfigPath.replace('tsconfig', 'tsconfig.temp')
@@ -59,21 +59,21 @@ describe('duel', () => {
     await rename(tsConfigPathTemp, tsConfigPath)
   })
 
-  it.skip('reports errors when --project is a directory with no tsconfig.json', async t => {
+  it('reports errors when --project is a directory with no tsconfig.json', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     await duel(['-p', 'test/__fixtures__'])
     assert.ok(spy.mock.calls[0].arguments[1].endsWith('no tsconfig.json.'))
   })
 
-  it.skip('reports errors when --project is not valid json', async t => {
+  it('reports errors when --project is not valid json', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     await duel(['-p', 'test/__fixtures__/esmProject/tsconfig.not.json'])
     assert.ok(spy.mock.calls[0].arguments[1].endsWith('not parsable as JSONC.'))
   })
 
-  it.skip('reports errors when using deprecated --target-extension', async t => {
+  it('reports errors when using deprecated --target-extension', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     await duel(['-x', '.mjs'])
@@ -132,7 +132,7 @@ describe('duel', () => {
     assert.equal(statusCjs, 0)
   })
 
-  it.skip('creates a dual ESM build while transforming module globals', async t => {
+  it('creates a dual ESM build while transforming module globals', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     t.after(async () => {
@@ -165,18 +165,18 @@ describe('duel', () => {
     const { status: statusCjs } = spawnSync(
       'node',
       ['test/__fixtures__/cjsProject/dist/index.js'],
-      { stdio: 'inherit' },
+      { shell, stdio: 'inherit' },
     )
     assert.equal(statusCjs, 0)
     const { status: statusEsm } = spawnSync(
       'node',
       ['test/__fixtures__/cjsProject/dist/esm/index.mjs'],
-      { stdio: 'inherit' },
+      { shell, stdio: 'inherit' },
     )
     assert.equal(statusEsm, 0)
   })
 
-  it.skip('supports both builds output to directories', async t => {
+  it('supports both builds output to directories', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     t.after(async () => {
@@ -191,7 +191,7 @@ describe('duel', () => {
     assert.ok(existsSync(resolve(proDist, 'cjs/index.cjs')))
   })
 
-  it.skip('supports import attributes and ts import assertion resolution mode', async t => {
+  it('supports import attributes and ts import assertion resolution mode', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     t.after(async () => {
@@ -204,7 +204,7 @@ describe('duel', () => {
     )
   })
 
-  it.skip('works as a cli script', () => {
+  it('works as a cli script', () => {
     const resp = execSync(`${resolve('./src/duel.js')} -h`, {
       cwd: resolve(__dirname, '..'),
     })
@@ -212,7 +212,7 @@ describe('duel', () => {
     assert.ok(resp.toString().indexOf('Options:') > -1)
   })
 
-  it.skip('reports compilation errors during a build', async t => {
+  it('reports compilation errors during a build', async t => {
     const spy = t.mock.method(global.console, 'log')
     const spyExit = t.mock.method(process, 'exit')
 
@@ -233,7 +233,7 @@ describe('duel', () => {
     assert.equal(spy.mock.calls[1].arguments[1], 'Compilation errors found.')
   })
 
-  it.skip('reports an error when no package.json file found', async t => {
+  it('reports an error when no package.json file found', async t => {
     const spy = t.mock.method(global.console, 'log')
 
     t.after(async () => {
diff --git a/test/monorepos.js b/test/monorepos.js
index a3b29ac..45e384f 100644
--- a/test/monorepos.js
+++ b/test/monorepos.js
@@ -3,6 +3,7 @@ import assert from 'node:assert/strict'
 import { resolve, join } from 'node:path'
 import { rm } from 'node:fs/promises'
 import { spawnSync } from 'node:child_process'
+import { platform } from 'node:process'
 
 import { duel } from '../src/duel.js'
 
@@ -10,6 +11,7 @@ const fixtures = resolve(import.meta.dirname, '__fixtures__')
 const npm = join(fixtures, 'mononpm')
 const npmOne = join(npm, 'one')
 const npmTwo = join(npm, 'two')
+const shell = platform === 'win32'
 const rmDist = async distPath => {
   await rm(distPath, { recursive: true, force: true })
 }
@@ -26,7 +28,7 @@ describe('duel monorepos', () => {
       await rmDist(join(npmTwo, 'dist'))
     })
 
-    spawnSync('npm', ['install'], { cwd: npm })
+    spawnSync('npm', ['install'], { shell, cwd: npm })
 
     // Build the packages (dependency first)
     await duel(['-p', npmTwo, '-k', npmTwo, '-m'])
@@ -34,23 +36,25 @@ describe('duel monorepos', () => {
 
     // Check for runtime errors against Node.js
     const { status: twoEsm } = spawnSync('node', [join(npmTwo, 'dist', 'file.js')], {
+      shell,
       stdio: 'inherit',
     })
     assert.equal(twoEsm, 0)
     const { status: twoCjs } = spawnSync(
       'node',
       [join(npmTwo, 'dist', 'cjs', 'file.cjs')],
-      { stdio: 'inherit' },
+      { shell, stdio: 'inherit' },
     )
     assert.equal(twoCjs, 0)
     const { status: oneEsm } = spawnSync('node', [join(npmOne, 'dist', 'main.js')], {
+      shell,
       stdio: 'inherit',
     })
     assert.equal(oneEsm, 0)
     const { status: oneCjs } = spawnSync(
       'node',
       [join(npmOne, 'dist', 'cjs', 'main.cjs')],
-      { stdio: 'inherit' },
+      { shell, stdio: 'inherit' },
     )
     assert.equal(oneCjs, 0)
   })