diff --git a/tests/e2e/modules_test.ts b/tests/e2e/modules_test.ts
new file mode 100644
index 0000000..bc8f1c8
--- /dev/null
+++ b/tests/e2e/modules_test.ts
@@ -0,0 +1,204 @@
+// #113 - E2E tests for /modules endpoints
+
+import { assertEquals, assertExists } from "@std/assert";
+import {
+  makeContextWithAffiliation,
+  makeEmployeeContext,
+  makeGetRequest,
+  makeJsonRequest,
+} from "../helpers/handler.ts";
+import { seedModules, truncateAll } from "../helpers/db_integration.ts";
+import { handler as modulesHandler } from "$apps/admin/api/modules.ts";
+import { handler as moduleHandler } from "$apps/admin/api/modules/[idModule].ts";
+
+// --- GET /modules ---
+
+Deno.test({
+  name: "e2e modules: GET /modules returns all as employee",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "MATH101", nom: "Mathématiques" }, { id: "INFO101", nom: "Informatique" }]);
+    const res = await modulesHandler.GET!(makeGetRequest("/modules"), makeEmployeeContext());
+    assertEquals(res.status, 200);
+    const body = await res.json();
+    assertEquals(body.length, 2);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "e2e modules: GET /modules returns empty for non-employee",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "MATH101", nom: "Mathématiques" }]);
+    const res = await modulesHandler.GET!(
+      makeGetRequest("/modules"),
+      makeContextWithAffiliation("student"),
+    );
+    assertEquals(res.status, 200);
+    const body = await res.json();
+    assertEquals(body.length, 0);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+// --- POST /modules ---
+
+Deno.test({
+  name: "e2e modules: POST /modules creates module (201)",
+  async fn() {
+    await truncateAll();
+    const res = await modulesHandler.POST!(
+      makeJsonRequest("/modules", "POST", { id: "PHYS101", nom: "Physique" }),
+      makeEmployeeContext(),
+    );
+    assertEquals(res.status, 201);
+    const body = await res.json();
+    assertEquals(body.id, "PHYS101");
+    assertEquals(body.nom, "Physique");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "e2e modules: POST /modules 409 on duplicate id",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "MATH101", nom: "Mathématiques" }]);
+    const res = await modulesHandler.POST!(
+      makeJsonRequest("/modules", "POST", { id: "MATH101", nom: "Doublon" }),
+      makeEmployeeContext(),
+    );
+    assertEquals(res.status, 409);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "e2e modules: POST /modules 400 on missing fields",
+  async fn() {
+    await truncateAll();
+    const res = await modulesHandler.POST!(
+      makeJsonRequest("/modules", "POST", { id: "X" }),
+      makeEmployeeContext(),
+    );
+    assertEquals(res.status, 400);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "e2e modules: POST /modules 403 for non-employee",
+  async fn() {
+    await truncateAll();
+    const res = await modulesHandler.POST!(
+      makeJsonRequest("/modules", "POST", { id: "X", nom: "Y" }),
+      makeContextWithAffiliation("student"),
+    );
+    assertEquals(res.status, 403);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+// --- GET /modules/:id ---
+
+Deno.test({
+  name: "e2e modules: GET /modules/:id returns module",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "ELEC201", nom: "Électronique" }]);
+    const res = await moduleHandler.GET!(
+      makeGetRequest("/modules/ELEC201"),
+      makeEmployeeContext({ idModule: "ELEC201" }),
+    );
+    assertEquals(res.status, 200);
+    const body = await res.json();
+    assertEquals(body.nom, "Électronique");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "e2e modules: GET /modules/:id 404 when not found",
+  async fn() {
+    await truncateAll();
+    const res = await moduleHandler.GET!(
+      makeGetRequest("/modules/GHOST"),
+      makeEmployeeContext({ idModule: "GHOST" }),
+    );
+    assertEquals(res.status, 404);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+// --- PUT /modules/:id ---
+
+Deno.test({
+  name: "e2e modules: PUT /modules/:id updates nom",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "CHIM101", nom: "Chimie" }]);
+    const res = await moduleHandler.PUT!(
+      makeJsonRequest("/modules/CHIM101", "PUT", { nom: "Chimie organique" }),
+      makeEmployeeContext({ idModule: "CHIM101" }),
+    );
+    assertEquals(res.status, 200);
+    const body = await res.json();
+    assertEquals(body.nom, "Chimie organique");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "e2e modules: PUT /modules/:id 404 when not found",
+  async fn() {
+    await truncateAll();
+    const res = await moduleHandler.PUT!(
+      makeJsonRequest("/modules/GHOST", "PUT", { nom: "X" }),
+      makeEmployeeContext({ idModule: "GHOST" }),
+    );
+    assertEquals(res.status, 404);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+// --- DELETE /modules/:id ---
+
+Deno.test({
+  name: "e2e modules: DELETE /modules/:id returns 204",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "BIO101", nom: "Biologie" }]);
+    const res = await moduleHandler.DELETE!(
+      makeGetRequest("/modules/BIO101"),
+      makeEmployeeContext({ idModule: "BIO101" }),
+    );
+    assertEquals(res.status, 204);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "e2e modules: DELETE /modules/:id 404 when not found",
+  async fn() {
+    await truncateAll();
+    const res = await moduleHandler.DELETE!(
+      makeGetRequest("/modules/GHOST"),
+      makeEmployeeContext({ idModule: "GHOST" }),
+    );
+    assertEquals(res.status, 404);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
diff --git a/tests/integration/modules_test.ts b/tests/integration/modules_test.ts
new file mode 100644
index 0000000..f0acc7f
--- /dev/null
+++ b/tests/integration/modules_test.ts
@@ -0,0 +1,98 @@
+// #113 - Integration tests for /modules endpoints
+
+import { assertEquals, assertExists, assertRejects } from "@std/assert";
+import { seedModules, testDb, truncateAll } from "../helpers/db_integration.ts";
+import { modules } from "$root/databases/schema.ts";
+import { eq } from "npm:drizzle-orm@0.45.2";
+
+Deno.test({
+  name: "integration modules: list all modules",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "MATH101", nom: "Mathématiques" }, { id: "INFO101", nom: "Informatique" }]);
+    const rows = await testDb.select().from(modules);
+    assertEquals(rows.length, 2);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration modules: create and retrieve by id",
+  async fn() {
+    await truncateAll();
+    const [created] = await testDb.insert(modules).values({ id: "PHYS101", nom: "Physique" }).returning();
+    assertExists(created);
+    assertEquals(created.id, "PHYS101");
+
+    const row = await testDb
+      .select()
+      .from(modules)
+      .where(eq(modules.id, "PHYS101"))
+      .then((r) => r[0] ?? null);
+    assertExists(row);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration modules: get by id returns null when not found",
+  async fn() {
+    await truncateAll();
+    const row = await testDb
+      .select()
+      .from(modules)
+      .where(eq(modules.id, "NONEXISTENT"))
+      .then((r) => r[0] ?? null);
+    assertEquals(row, null);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration modules: duplicate id insert fails",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "MATH101", nom: "Mathématiques" }]);
+    await assertRejects(() =>
+      testDb.insert(modules).values({ id: "MATH101", nom: "Doublon" })
+    );
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration modules: update nom",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "ELEC201", nom: "Électronique" }]);
+    const [updated] = await testDb
+      .update(modules)
+      .set({ nom: "Électronique numérique" })
+      .where(eq(modules.id, "ELEC201"))
+      .returning();
+    assertEquals(updated.nom, "Électronique numérique");
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
+
+Deno.test({
+  name: "integration modules: delete removes the module",
+  async fn() {
+    await truncateAll();
+    await seedModules([{ id: "BIO101", nom: "Biologie" }]);
+    await testDb.delete(modules).where(eq(modules.id, "BIO101"));
+    const row = await testDb
+      .select()
+      .from(modules)
+      .where(eq(modules.id, "BIO101"))
+      .then((r) => r[0] ?? null);
+    assertEquals(row, null);
+  },
+  sanitizeResources: false,
+  sanitizeOps: false,
+});
diff --git a/tests/unit/modules_test.ts b/tests/unit/modules_test.ts
new file mode 100644
index 0000000..c9f2276
--- /dev/null
+++ b/tests/unit/modules_test.ts
@@ -0,0 +1,151 @@
+// #113 - Unit tests for /modules endpoints
+
+import { assertEquals, assertExists } from "@std/assert";
+import { mockFetch, restoreFetch } from "../helpers/api_mock.ts";
+import { createMockDb } from "../helpers/db_mock.ts";
+import { type Module, modules } from "../helpers/fixtures.ts";
+
+// --- Fixtures ---
+
+Deno.test("modules: fixtures have correct shape", () => {
+  assertEquals(modules.length, 3);
+  assertEquals(typeof modules[0].id, "string");
+  assertEquals(typeof modules[0].nom, "string");
+});
+
+// --- Mock API ---
+
+Deno.test("mock API: GET /modules returns list", async () => {
+  mockFetch({ "/modules": modules });
+  try {
+    const res = await fetch("http://localhost/api/modules");
+    assertEquals(res.status, 200);
+    const data: Module[] = await res.json();
+    assertEquals(data.length, 3);
+    assertExists(data.find((m) => m.id === "JIN702C"));
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mock API: GET /modules/:id returns one module", async () => {
+  mockFetch({ "/modules/JIN702C": modules[0] });
+  try {
+    const res = await fetch("http://localhost/api/modules/JIN702C");
+    assertEquals(res.status, 200);
+    const data: Module = await res.json();
+    assertEquals(data.id, "JIN702C");
+    assertEquals(data.nom, "Optimisation");
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mock API: GET /modules/:id 404 when not found", async () => {
+  mockFetch({ "/modules/UNKNOWN": { status: 404, body: { error: "Ressource introuvable" } } });
+  try {
+    const res = await fetch("http://localhost/api/modules/UNKNOWN");
+    assertEquals(res.status, 404);
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mock API: POST /modules creates module (201)", async () => {
+  const newModule: Module = { id: "NEW101", nom: "Nouveau Module" };
+  mockFetch({ "/modules": { method: "POST", status: 201, body: newModule } });
+  try {
+    const res = await fetch("http://localhost/api/modules", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify(newModule),
+    });
+    assertEquals(res.status, 201);
+    const data: Module = await res.json();
+    assertEquals(data.id, "NEW101");
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mock API: POST /modules 409 on duplicate id", async () => {
+  mockFetch({ "/modules": { method: "POST", status: 409, body: { error: "Un module avec cet identifiant existe déjà" } } });
+  try {
+    const res = await fetch("http://localhost/api/modules", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify(modules[0]),
+    });
+    assertEquals(res.status, 409);
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mock API: POST /modules 400 on missing fields", async () => {
+  mockFetch({ "/modules": { method: "POST", status: 400 } });
+  try {
+    const res = await fetch("http://localhost/api/modules", {
+      method: "POST",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ id: "X" }),
+    });
+    assertEquals(res.status, 400);
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mock API: PUT /modules/:id updates nom", async () => {
+  const updated: Module = { id: "JIN702C", nom: "Optimisation avancée" };
+  mockFetch({ "/modules/JIN702C": { method: "PUT", status: 200, body: updated } });
+  try {
+    const res = await fetch("http://localhost/api/modules/JIN702C", {
+      method: "PUT",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ nom: "Optimisation avancée" }),
+    });
+    assertEquals(res.status, 200);
+    const data: Module = await res.json();
+    assertEquals(data.nom, "Optimisation avancée");
+  } finally {
+    restoreFetch();
+  }
+});
+
+Deno.test("mock API: DELETE /modules/:id returns 204", async () => {
+  mockFetch({ "/modules/JIN702C": { method: "DELETE", status: 204 } });
+  try {
+    const res = await fetch("http://localhost/api/modules/JIN702C", { method: "DELETE" });
+    assertEquals(res.status, 204);
+  } finally {
+    restoreFetch();
+  }
+});
+
+// --- Mock DB ---
+
+Deno.test("mock DB: find module by id", () => {
+  const db = createMockDb({ tables: { modules: [...modules] } });
+  const m = db.findOne<Module>("modules", (m) => m.id === "JIN702C");
+  assertExists(m);
+  assertEquals(m.nom, "Optimisation");
+});
+
+Deno.test("mock DB: insert module", () => {
+  const db = createMockDb({ tables: { modules: [...modules] } });
+  db.insert<Module>("modules", { id: "NEW101", nom: "Nouveau" });
+  assertEquals(db.getTable("modules").length, 4);
+});
+
+Deno.test("mock DB: update module nom", () => {
+  const db = createMockDb({ tables: { modules: [...modules] } });
+  db.updateWhere<Module>("modules", (m) => m.id === "JIN702C", { nom: "Updated" });
+  assertEquals(db.findOne<Module>("modules", (m) => m.id === "JIN702C")?.nom, "Updated");
+});
+
+Deno.test("mock DB: delete module", () => {
+  const db = createMockDb({ tables: { modules: [...modules] } });
+  db.deleteWhere<Module>("modules", (m) => m.id === "JIN702C");
+  assertEquals(db.getTable("modules").length, 2);
+});