diff --git a/tests/unit/settingsStore.test.ts b/tests/unit/settingsStore.test.ts
index a675dc87..4d6f7e7c 100644
--- a/tests/unit/settingsStore.test.ts
+++ b/tests/unit/settingsStore.test.ts
@@ -9,6 +9,8 @@ const mockProvider: ProviderConfig = {
   model: "gpt-4o",
 };
 
+const DEFAULT_PII_PATTERNS = ["email", "ip_address", "phone", "ssn", "credit_card", "hostname", "password", "api_key"];
+
 describe("Settings Store", () => {
   beforeEach(() => {
     localStorage.clear();
@@ -19,6 +21,7 @@ describe("Settings Store", () => {
       default_provider: "ollama",
       default_model: "llama3.2:3b",
       ollama_url: "http://localhost:11434",
+      pii_enabled_patterns: Object.fromEntries(DEFAULT_PII_PATTERNS.map((id) => [id, true])),
     });
   });
 
@@ -52,3 +55,54 @@ describe("Settings Store", () => {
     expect(raw).not.toContain("sk-test-key");
   });
 });
+
+describe("Settings Store — PII patterns", () => {
+  beforeEach(() => {
+    localStorage.clear();
+    useSettingsStore.setState({
+      theme: "dark",
+      ai_providers: [],
+      active_provider: undefined,
+      default_provider: "ollama",
+      default_model: "llama3.2:3b",
+      ollama_url: "http://localhost:11434",
+      pii_enabled_patterns: Object.fromEntries(DEFAULT_PII_PATTERNS.map((id) => [id, true])),
+    });
+  });
+
+  it("initializes all 8 PII patterns as enabled by default", () => {
+    const patterns = useSettingsStore.getState().pii_enabled_patterns;
+    for (const id of DEFAULT_PII_PATTERNS) {
+      expect(patterns[id]).toBe(true);
+    }
+  });
+
+  it("setPiiPattern disables a single pattern", () => {
+    useSettingsStore.getState().setPiiPattern("email", false);
+    expect(useSettingsStore.getState().pii_enabled_patterns["email"]).toBe(false);
+  });
+
+  it("setPiiPattern does not affect other patterns", () => {
+    useSettingsStore.getState().setPiiPattern("email", false);
+    for (const id of DEFAULT_PII_PATTERNS.filter((id) => id !== "email")) {
+      expect(useSettingsStore.getState().pii_enabled_patterns[id]).toBe(true);
+    }
+  });
+
+  it("setPiiPattern re-enables a disabled pattern", () => {
+    useSettingsStore.getState().setPiiPattern("ssn", false);
+    useSettingsStore.getState().setPiiPattern("ssn", true);
+    expect(useSettingsStore.getState().pii_enabled_patterns["ssn"]).toBe(true);
+  });
+
+  it("pii_enabled_patterns is persisted to localStorage", () => {
+    useSettingsStore.getState().setPiiPattern("api_key", false);
+    const raw = localStorage.getItem("tftsr-settings");
+    expect(raw).toBeTruthy();
+    // Zustand persist wraps state in { state: {...}, version: ... }
+    const parsed = JSON.parse(raw!);
+    const stored = parsed.state ?? parsed;
+    expect(stored.pii_enabled_patterns.api_key).toBe(false);
+    expect(stored.pii_enabled_patterns.email).toBe(true);
+  });
+});