diff --git a/src/cli/build-cjs.spec.ts b/src/cli/build-cjs.spec.ts
index 2444cf9..381b3e3 100644
--- a/src/cli/build-cjs.spec.ts
+++ b/src/cli/build-cjs.spec.ts
@@ -1,4 +1,5 @@
 import * as mockfs from 'mock-fs'
+import { normalize } from 'path'
 import { expect } from 'aria-mocha'
 
 import { BuildFormatOptions } from './common'
@@ -6,6 +7,10 @@ import { buildCommonJS } from './build-cjs'
 
 describe('build-cjs', () => {
 
+  function assertPath(actual: string, expected: string) {
+    expect(normalize(actual)).equal(normalize(expected))
+  }
+
   afterEach(() => {
     mockfs.restore()
   })
@@ -29,9 +34,10 @@ describe('build-cjs', () => {
 
     const config = buildCommonJS(options)
 
-    expect(config.input).equal(`src/${options.pkgName}.ts`)
+    assertPath(config.input as string, `src/${options.pkgName}.ts`)
+    assertPath(config.output.file, `./${options.output}/${options.pkgName}.js`)
+
     expect(config.output.format).equal(options.format)
-    expect(config.output.file).equal(`./${options.output}/${options.pkgName}.js`)
     expect(config.output.sourcemap).toBeTrue()
     expect(config.tsconfig.compilerOptions.declaration).equal(options.declaration)
     expect(config.external.length).equal(0)
@@ -73,8 +79,9 @@ describe('build-cjs', () => {
 
     const config = buildCommonJS(options)
 
-    expect(config.input).equal(`src/${options.pkgName}.ts`)
-    expect(config.output.file).equal(`./${options.output}/${options.pkgName}.js`)
+    assertPath(config.input as string, `src/${options.pkgName}.ts`)
+    assertPath(config.output.file, `./${options.output}/${options.pkgName}.js`)
+    
     expect(config.output.sourcemap).toBeTrue()
     expect(config.compress).toBeTrue()
     expect(config.external.length).equal(0)
diff --git a/src/cli/build-es.spec.ts b/src/cli/build-es.spec.ts
index df193b3..682fae9 100644
--- a/src/cli/build-es.spec.ts
+++ b/src/cli/build-es.spec.ts
@@ -1,4 +1,6 @@
 import * as mockfs from 'mock-fs'
+
+import { normalize } from 'path'
 import { expect } from 'aria-mocha'
 
 import { BuildFormatOptions } from './common'
@@ -6,6 +8,10 @@ import { buildES } from './build-es'
 
 describe('build-es', () => {
 
+  function assertPath(actual: string, expected: string) {
+    expect(normalize(actual)).equal(normalize(expected))
+  }
+
   afterEach(() => {
     mockfs.restore()
   })
@@ -29,9 +35,10 @@ describe('build-es', () => {
 
     const config = buildES(options)
 
-    expect(config.input).equal(`src/${options.pkgName}.ts`)
+    assertPath(config.input as string, `src/${options.pkgName}.ts`)
+    assertPath(config.output.file, `./${options.output}/${options.pkgName}.js`)
+
     expect(config.output.format).equal(options.format)
-    expect(config.output.file).equal(`./${options.output}/${options.pkgName}.js`)
     expect(config.output.sourcemap).toBeTrue()
     expect(config.tsconfig.compilerOptions.declaration).equal(options.declaration)
     expect(config.external.length).equal(0)
@@ -95,7 +102,7 @@ describe('build-es', () => {
 
     const config = buildES(options)
 
-    expect(config.input).equal(`src/${options.pkgName}.ts`)
+    assertPath(config.input as string, `src/${options.pkgName}.ts`)
     expect(config.output.format).equal('es')
   })
 
diff --git a/src/cli/build-umd.spec.ts b/src/cli/build-umd.spec.ts
index 35fd995..7053643 100644
--- a/src/cli/build-umd.spec.ts
+++ b/src/cli/build-umd.spec.ts
@@ -1,4 +1,6 @@
 import * as mockfs from 'mock-fs'
+
+import { normalize } from 'path'
 import { expect } from 'aria-mocha'
 
 import { BuildFormatOptions } from './common'
@@ -6,6 +8,10 @@ import { buildUmd } from './build-umd'
 
 describe('build-umd', () => {
 
+  function assertPath(actual: string, expected: string) {
+    expect(normalize(actual)).equal(normalize(expected))
+  }
+
   afterEach(() => {
     mockfs.restore()
   })
@@ -29,9 +35,10 @@ describe('build-umd', () => {
 
     const config = buildUmd(options)
 
-    expect(config.input).equal(`src/${options.pkgName}.ts`)
+    assertPath(config.input as string, `src/${options.pkgName}.ts`)
+    assertPath(config.output.file, `./${options.output}/${options.pkgName}.js`)
+
     expect(config.output.format).equal(options.format)
-    expect(config.output.file).equal(`./${options.output}/${options.pkgName}.js`)
     expect(config.output.sourcemap).toBeTrue()
     expect(config.external.length).equal(0)
   })
@@ -94,7 +101,7 @@ describe('build-umd', () => {
 
     const config = buildUmd(options)
 
-    expect(config.input).equal(`src/${options.pkgName}.ts`)
+    assertPath(config.input as string, `src/${options.pkgName}.ts`) 
     expect(config.output.format).equal('umd')
   })