diff --git a/apps/api/src/proxmox/proxmox-normalize.spec.ts b/apps/api/src/proxmox/proxmox-normalize.spec.ts
index 2749250..400270f 100644
--- a/apps/api/src/proxmox/proxmox-normalize.spec.ts
+++ b/apps/api/src/proxmox/proxmox-normalize.spec.ts
@@ -237,4 +237,51 @@ describe('normalizePmg (Aufgabe 3, <behavior>)', () => {
       virusCount: null,
     });
   });
+
+  it('nur eine Haelfte vorhanden -> null (Spam, nur spamcount_in)', () => {
+    const body = { data: { spamcount_in: 10 } };
+    const { metrics } = normalizePmg(body);
+    expect(metrics.spamCount).toBeNull();
+  });
+
+  it('nur eine Haelfte vorhanden -> null (Spam, nur spamcount_out)', () => {
+    const body = { data: { spamcount_out: 2 } };
+    const { metrics } = normalizePmg(body);
+    expect(metrics.spamCount).toBeNull();
+  });
+
+  it('nur eine Haelfte vorhanden -> null (Viren, nur viruscount_in)', () => {
+    const body = { data: { viruscount_in: 1 } };
+    const { metrics } = normalizePmg(body);
+    expect(metrics.virusCount).toBeNull();
+  });
+
+  it('nur eine Haelfte vorhanden -> null (Viren, nur viruscount_out)', () => {
+    const body = { data: { viruscount_out: 3 } };
+    const { metrics } = normalizePmg(body);
+    expect(metrics.virusCount).toBeNull();
+  });
+
+  it('eine Haelfte ist nicht lesbar -> null (Spam, spamcount_out ist Text)', () => {
+    const body = { data: { spamcount_in: 10, spamcount_out: 'abc' } };
+    const { metrics } = normalizePmg(body);
+    expect(metrics.spamCount).toBeNull();
+  });
+
+  it('Unabhaengigkeit der Paare: Spam unvollstaendig, Viren vollstaendig -> spamCount null, virusCount 1, countIn/countOut unberuehrt', () => {
+    const body = {
+      data: {
+        count_in: 100,
+        count_out: 50,
+        spamcount_in: 10,
+        viruscount_in: 1,
+        viruscount_out: 0,
+      },
+    };
+    const { metrics } = normalizePmg(body);
+    expect(metrics.spamCount).toBeNull();
+    expect(metrics.virusCount).toBe(1);
+    expect(metrics.countIn).toBe(100);
+    expect(metrics.countOut).toBe(50);
+  });
 });