feat: add assertBodyNotContains method

src/response.ts

@@ -344,6 +344,15 @@ export class ApiResponse extends Macroable {
     this.assert!.containsSubset(this.body(), expectedBody)
   }
 
+  /**
+   * Assert response body not to match the subset from the
+   * expected body
+   */
+  public assertBodyNotContains(expectedBody: any) {
+    this.ensureHasAssert()
+    this.assert!.notContainsSubset(this.body(), expectedBody)
+  }
+
   /**
    * Assert response to contain a given cookie and optionally
    * has the expected value

tests/response/assertions.spec.ts

@@ -97,6 +97,24 @@ test.group('Response | assertions', (group) => {
     response.assertBodyContains([{ message: 'hello world' }, { message: 'hi world' }])
   })
 
+  test('assert response body not subset', async ({ assert }) => {
+    assert.plan(1)
+
+    httpServer.onRequest((_, res) => {
+      res.statusCode = 200
+      res.setHeader('content-type', 'application/json')
+      res.end(JSON.stringify([{ message: 'hello world', time: new Date() }]))
+    })
+
+    const request = new ApiRequest(
+      { baseUrl: httpServer.baseUrl, method: 'GET', endpoint: '/' },
+      assert
+    )
+
+    const response = await request
+    response.assertBodyNotContains([{ message: 'hi world' }])
+  })
+
   test('assert response body when response is not json', async ({ assert }) => {
     httpServer.onRequest((_, res) => {
       res.statusCode = 401