diff --git a/tests/helpers/db_mock.ts b/tests/helpers/db_mock.ts
new file mode 100644
index 0000000..4d18bb9
--- /dev/null
+++ b/tests/helpers/db_mock.ts
@@ -0,0 +1,122 @@
+// Mock de la couche Drizzle pour les tests unitaires/intégration
+// Permet de tester les handlers sans connexion PostgreSQL
+
+export interface MockQueryResult<T> {
+  rows: T[];
+}
+
+export interface MockDbConfig {
+  // Table name → array of rows
+  // deno-lint-ignore no-explicit-any
+  tables: Record<string, Record<string, any>[]>;
+}
+
+/**
+ * Crée un mock de la DB Drizzle.
+ * Simule select/insert/update/delete avec un store en mémoire.
+ *
+ * Usage :
+ * ```ts
+ * const db = createMockDb({
+ *   tables: {
+ *     students: [{ numEtud: 21212006, nom: "Dupont", ... }],
+ *     notes: [],
+ *   }
+ * });
+ *
+ * // Lire toutes les lignes d'une table
+ * const rows = db.getTable("students");
+ *
+ * // Insérer
+ * db.insert("students", { numEtud: 21212009, nom: "Test", ... });
+ *
+ * // Trouver par clé
+ * const student = db.findOne("students", (r) => r.numEtud === 21212006);
+ *
+ * // Supprimer
+ * db.deleteWhere("students", (r) => r.numEtud === 21212006);
+ * ```
+ */
+export function createMockDb(config: MockDbConfig) {
+  // Deep clone pour éviter les mutations entre tests
+  // deno-lint-ignore no-explicit-any
+  const tables: Record<string, Record<string, any>[]> = {};
+  for (const [name, rows] of Object.entries(config.tables)) {
+    tables[name] = rows.map((r) => ({ ...r }));
+  }
+
+  return {
+    /** Retourne toutes les lignes d'une table */
+    getTable<T = Record<string, unknown>>(name: string): T[] {
+      return (tables[name] ?? []) as T[];
+    },
+
+    /** Retourne les lignes qui matchent le filtre */
+    findMany<T = Record<string, unknown>>(
+      name: string,
+      predicate: (row: T) => boolean,
+    ): T[] {
+      return (this.getTable<T>(name)).filter(predicate);
+    },
+
+    /** Retourne la première ligne qui matche, ou undefined */
+    findOne<T = Record<string, unknown>>(
+      name: string,
+      predicate: (row: T) => boolean,
+    ): T | undefined {
+      return (this.getTable<T>(name)).find(predicate);
+    },
+
+    /** Insère une ligne dans la table */
+    insert<T = Record<string, unknown>>(name: string, row: T): T {
+      if (!tables[name]) tables[name] = [];
+      const copy = { ...row } as T;
+      // deno-lint-ignore no-explicit-any
+      tables[name].push(copy as any);
+      return copy;
+    },
+
+    /** Met à jour les lignes qui matchent le prédicat */
+    updateWhere<T = Record<string, unknown>>(
+      name: string,
+      predicate: (row: T) => boolean,
+      updates: Partial<T>,
+    ): number {
+      const rows = this.getTable<T>(name);
+      let count = 0;
+      for (const row of rows) {
+        if (predicate(row)) {
+          Object.assign(row as Record<string, unknown>, updates);
+          count++;
+        }
+      }
+      return count;
+    },
+
+    /** Supprime les lignes qui matchent le prédicat */
+    deleteWhere<T = Record<string, unknown>>(
+      name: string,
+      predicate: (row: T) => boolean,
+    ): number {
+      const before = (tables[name] ?? []).length;
+      tables[name] = (tables[name] ?? []).filter(
+        (r) => !predicate(r as unknown as T),
+      );
+      return before - tables[name].length;
+    },
+
+    /** Vide une table */
+    clear(name: string): void {
+      tables[name] = [];
+    },
+
+    /** Vide toutes les tables */
+    reset(): void {
+      for (const name of Object.keys(tables)) {
+        tables[name] = [];
+      }
+    },
+  };
+}
+
+export type MockDb = ReturnType<typeof createMockDb>;
diff --git a/tests/unit/example_test.ts b/tests/unit/example_test.ts
index 1de45e0..b0dc313 100644
--- a/tests/unit/example_test.ts
+++ b/tests/unit/example_test.ts
@@ -1,24 +1,46 @@
 import { assertEquals, assertExists } from "@std/assert";
-import { mockFetch, restoreFetch } from "../helpers/api_mock.ts";
-import { notes, students } from "../helpers/fixtures.ts";
+import {
+  getFetchCalls,
+  mockFetch,
+  restoreFetch,
+} from "../helpers/api_mock.ts";
+import { createMockDb } from "../helpers/db_mock.ts";
+import {
+  type Student,
+  ERROR_CONFLICT,
+  ERROR_NOT_FOUND,
+  modules,
+  notes,
+  students,
+} from "../helpers/fixtures.ts";
 import { cleanupDOM, setupDOM } from "../helpers/render.ts";
 
-Deno.test("fixtures - students have expected shape", () => {
+// --- Fixtures ---
+
+Deno.test("fixtures - students match API shape", () => {
   assertEquals(students.length, 3);
-  assertEquals(students[0].nom, "Dupont");
-  assertExists(students[0].numEtud);
+  assertEquals(students[0].numEtud, 21212006);
+  assertEquals(students[0].idPromo, "4AFISE25/26");
+  assertEquals(typeof students[0].idPromo, "string");
 });
 
-Deno.test("mockFetch - returns mocked data for matching route", async () => {
-  mockFetch({
-    "/students": students,
-    "/notes": notes,
-  });
+Deno.test("fixtures - modules have string ids", () => {
+  assertEquals(modules[0].id, "JIN702C");
+  assertEquals(typeof modules[0].id, "string");
+});
 
+Deno.test("fixtures - notes use decimal values", () => {
+  assertEquals(notes[0].note, 15.5);
+  assertEquals(notes[0].idModule, "JIN702C");
+});
+
+// --- Mock fetch simple (GET 200) ---
+
+Deno.test("mockFetch - GET returns mocked data", async () => {
+  mockFetch({ "/students": students });
   try {
     const res = await fetch("http://localhost/api/students");
     assertEquals(res.status, 200);
-
     const data = await res.json();
     assertEquals(data.length, 3);
     assertEquals(data[0].nom, "Dupont");
@@ -29,7 +51,6 @@ Deno.test("mockFetch - returns mocked data for matching route", async () => {
 
 Deno.test("mockFetch - returns 404 for unknown routes", async () => {
   mockFetch({});
-
   try {
     const res = await fetch("http://localhost/api/unknown");
     assertEquals(res.status, 404);
@@ -38,24 +59,208 @@ Deno.test("mockFetch - returns 404 for unknown routes", async () => {
   }
 });
 
+// --- Mock fetch avancé (méthodes + status codes) ---
+
+Deno.test("mockFetch - POST 201 created", async () => {
+  const newStudent = students[0];
+  mockFetch({
+    "/students": { method: "POST", status: 201, body: newStudent },
+  });
+  try {
+    const res = await fetch("http://localhost/api/students", {
+      method: "POST",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify(newStudent),
+    });
+    assertEquals(res.status, 201);
+    const data = await res.json();
+    assertEquals(data.numEtud, 21212006);
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mockFetch - DELETE 204 no content", async () => {
+  mockFetch({
+    "/students/21212006": { method: "DELETE", status: 204 },
+  });
+  try {
+    const res = await fetch("http://localhost/api/students/21212006", {
+      method: "DELETE",
+    });
+    assertEquals(res.status, 204);
+    assertEquals(res.body, null);
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mockFetch - 404 error response", async () => {
+  mockFetch({
+    "/students/99999": { status: 404, body: ERROR_NOT_FOUND },
+  });
+  try {
+    const res = await fetch("http://localhost/api/students/99999");
+    assertEquals(res.status, 404);
+    const data = await res.json();
+    assertEquals(data.error, "Ressource introuvable");
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mockFetch - 409 conflict", async () => {
+  mockFetch({
+    "/enseignements": { method: "POST", status: 409, body: ERROR_CONFLICT },
+  });
+  try {
+    const res = await fetch("http://localhost/api/enseignements", {
+      method: "POST",
+      body: JSON.stringify({ idProf: 1, idModule: "JIN702C", idPromo: "4AFISE25/26" }),
+    });
+    assertEquals(res.status, 409);
+  } finally {
+    restoreFetch();
+  }
+});
+
+// --- getFetchCalls ---
+
+Deno.test("getFetchCalls - tracks all intercepted calls", async () => {
+  mockFetch({ "/notes": notes });
+  try {
+    await fetch("http://localhost/api/notes");
+    await fetch("http://localhost/api/notes?numEtud=21212006");
+    const calls = getFetchCalls();
+    assertEquals(calls.length, 2);
+    assertEquals(calls[0].method, "GET");
+    assertEquals(calls[1].url, "http://localhost/api/notes?numEtud=21212006");
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("getFetchCalls - captures POST body", async () => {
+  mockFetch({ "/notes": { method: "POST", status: 201, body: notes[0] } });
+  try {
+    await fetch("http://localhost/api/notes", {
+      method: "POST",
+      body: JSON.stringify(notes[0]),
+    });
+    const calls = getFetchCalls();
+    assertEquals(calls.length, 1);
+    assertEquals(calls[0].method, "POST");
+    assertEquals((calls[0].body as { note: number }).note, 15.5);
+  } finally {
+    restoreFetch();
+  }
+});
+
+// --- Mock DB ---
+
+Deno.test("mockDb - getTable returns seeded rows", () => {
+  const db = createMockDb({ tables: { students: [...students] } });
+  assertEquals(db.getTable("students").length, 3);
+});
+
+Deno.test("mockDb - findOne by key", () => {
+  const db = createMockDb({ tables: { students: [...students] } });
+  const found = db.findOne<Student>("students", (r) => r.numEtud === 21212006);
+  assertExists(found);
+  assertEquals(found.nom, "Dupont");
+});
+
+Deno.test("mockDb - findOne returns undefined for missing", () => {
+  const db = createMockDb({ tables: { students: [...students] } });
+  const found = db.findOne<Student>("students", (r) => r.numEtud === 99999);
+  assertEquals(found, undefined);
+});
+
+Deno.test("mockDb - insert adds a row", () => {
+  const db = createMockDb({ tables: { students: [] } });
+  const newStudent: Student = {
+    numEtud: 21212099,
+    nom: "Test",
+    prenom: "User",
+    idPromo: "4AFISE25/26",
+  };
+  db.insert("students", newStudent);
+  assertEquals(db.getTable("students").length, 1);
+  assertEquals(
+    db.findOne<Student>("students", (r) => r.numEtud === 21212099)?.nom,
+    "Test",
+  );
+});
+
+Deno.test("mockDb - updateWhere modifies matching rows", () => {
+  const db = createMockDb({ tables: { students: [...students] } });
+  const updated = db.updateWhere<Student>(
+    "students",
+    (r) => r.numEtud === 21212006,
+    { prenom: "Marie" },
+  );
+  assertEquals(updated, 1);
+  assertEquals(
+    db.findOne<Student>("students", (r) => r.numEtud === 21212006)?.prenom,
+    "Marie",
+  );
+});
+
+Deno.test("mockDb - deleteWhere removes matching rows", () => {
+  const db = createMockDb({ tables: { students: [...students] } });
+  const deleted = db.deleteWhere<Student>(
+    "students",
+    (r) => r.numEtud === 21212006,
+  );
+  assertEquals(deleted, 1);
+  assertEquals(db.getTable("students").length, 2);
+});
+
+Deno.test("mockDb - findMany with filter", () => {
+  const db = createMockDb({ tables: { students: [...students] } });
+  const promo4 = db.findMany<Student>(
+    "students",
+    (r) => r.idPromo === "4AFISE25/26",
+  );
+  assertEquals(promo4.length, 2);
+});
+
+Deno.test("mockDb - reset clears all tables", () => {
+  const db = createMockDb({
+    tables: { students: [...students], notes: [...notes] },
+  });
+  db.reset();
+  assertEquals(db.getTable("students").length, 0);
+  assertEquals(db.getTable("notes").length, 0);
+});
+
+Deno.test("mockDb - isolated between instances", () => {
+  const db1 = createMockDb({ tables: { students: [...students] } });
+  const db2 = createMockDb({ tables: { students: [...students] } });
+  db1.deleteWhere<Student>("students", () => true);
+  assertEquals(db1.getTable("students").length, 0);
+  assertEquals(db2.getTable("students").length, 3);
+});
+
+// --- happy-dom ---
+
 Deno.test({
   name: "happy-dom - document is available after setup",
   sanitizeResources: false,
   sanitizeOps: false,
   fn() {
-  setupDOM();
+    setupDOM();
+    try {
+      const doc = globalThis.document;
+      assertExists(doc);
 
-  try {
-    const doc = globalThis.document;
-    assertExists(doc);
+      const div = doc.createElement("div");
+      div.textContent = "hello";
+      doc.body.appendChild(div);
 
-    const div = doc.createElement("div");
-    div.textContent = "hello";
-    doc.body.appendChild(div);
-
-    assertEquals(doc.body.textContent, "hello");
-  } finally {
-    cleanupDOM();
-  }
+      assertEquals(doc.body.textContent, "hello");
+    } finally {
+      cleanupDOM();
+    }
   },
 });