diff --git a/src/tests/users/user_post.spec.ts b/src/tests/users/user_post.spec.ts
index 82ac7f4..8a6f7be 100644
--- a/src/tests/users/user_post.spec.ts
+++ b/src/tests/users/user_post.spec.ts
@@ -37,3 +37,77 @@ describe('POST /api/users valid', () => {
         expect(res.status).toEqual(200);
     });
 });
+// ---------------
+describe('POST /api/users invalid -> 400', () => {
+    it('user creation w/o firstname should return 400', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "lastname": "demo_createASD123_3",
+            "password": "demo_createASD123_3",
+            "email": "demo_createASD123_3@dev.lauf-fuer-kaya.de"
+        }, axios_config);
+        expect(res.status).toEqual(400);
+    });
+    it('user creation w/o lastname should return 400', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "firstname": "demo_createASD123_3",
+            "password": "demo_createASD123_3",
+            "email": "demo_createASD123_3@dev.lauf-fuer-kaya.de"
+        }, axios_config);
+        expect(res.status).toEqual(400);
+    });
+    it('user creation w/o password should return 400', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "firstname": "demo_createASD123_3",
+            "lastname": "demo_createASD123_3",
+            "email": "demo_createASD123_3@dev.lauf-fuer-kaya.de"
+        }, axios_config);
+        expect(res.status).toEqual(400);
+    });
+    it('user creation w/o email should return 400', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "firstname": "demo_createASD123_3",
+            "lastname": "demo_createASD123_3",
+            "password": "demo_createASD123_3"
+        }, axios_config);
+        expect(res.status).toEqual(400);
+    });
+});
+// ---------------
+describe('POST /api/users invalid -> Password errors', () => {
+    it('user creation w/ invalid password -> No numbers should return 406', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "firstname": "demo_createASD123_4",
+            "lastname": "demo_createASD123_4",
+            "password": "demo_createASD",
+            "email": "demo_createASD123_4@dev.lauf-fuer-kaya.de"
+        }, axios_config);
+        expect(res.status).toEqual(406);
+    });
+    it('user creation w/ invalid password -> No uppercase should return 406', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "firstname": "demo_createASD123_4",
+            "lastname": "demo_createASD123_4",
+            "password": "demo_create_4",
+            "email": "demo_createASD123_4@dev.lauf-fuer-kaya.de"
+        }, axios_config);
+        expect(res.status).toEqual(406);
+    });
+    it('user creation w/ invalid password -> No lowercase should return 406', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "firstname": "demo_createASD123_4",
+            "lastname": "demo_createASD123_4",
+            "password": "DEMO123123ASD",
+            "email": "demo_createASD123_4@dev.lauf-fuer-kaya.de"
+        }, axios_config);
+        expect(res.status).toEqual(406);
+    });
+    it('user creation w/ invalid password -> Too short should return 406', async () => {
+        const res = await axios.post(base + '/api/users', {
+            "firstname": "demo_createASD123_4",
+            "lastname": "demo_createASD123_4",
+            "password": "1Aa_",
+            "email": "demo_createASD123_4@dev.lauf-fuer-kaya.de"
+        }, axios_config);
+        expect(res.status).toEqual(406);
+    });
+});
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