diff --git a/server/api/api/auth/login/index.test.ts b/server/api/api/auth/login/index.test.ts
new file mode 100644
index 00000000..153213ff
--- /dev/null
+++ b/server/api/api/auth/login/index.test.ts
@@ -0,0 +1,230 @@
+import { afterAll, describe, expect, test } from "bun:test";
+import { randomBytes } from "node:crypto";
+import { eq } from "drizzle-orm";
+import { db } from "~drizzle/db";
+import { Applications } from "~drizzle/schema";
+import { config } from "~packages/config-manager";
+import {
+    deleteOldTestUsers,
+    getTestUsers,
+    sendTestRequest,
+} from "~tests/utils";
+import { meta } from "./index";
+
+await deleteOldTestUsers();
+
+const { users, deleteUsers, passwords } = await getTestUsers(1);
+
+// Create application
+const application = (
+    await db
+        .insert(Applications)
+        .values({
+            name: "Test Application",
+            clientId: randomBytes(32).toString("hex"),
+            secret: "test",
+            redirectUri: "https://example.com",
+            scopes: "read write",
+        })
+        .returning()
+)[0];
+
+afterAll(async () => {
+    await deleteUsers();
+    await db.delete(Applications).where(eq(Applications.id, application.id));
+});
+
+// /api/auth/login
+describe(meta.route, () => {
+    test("should get a JWT with email", async () => {
+        const formData = new FormData();
+
+        formData.append("identifier", users[0]?.getUser().email ?? "");
+        formData.append("password", passwords[0]);
+
+        const response = await sendTestRequest(
+            new Request(
+                new URL(
+                    `/api/auth/login?client_id=${application.clientId}&redirect_uri=https://example.com&response_type=code&scope=read+write`,
+                    config.http.base_url,
+                ),
+                {
+                    method: "POST",
+                    body: formData,
+                },
+            ),
+        );
+
+        expect(response.status).toBe(302);
+        expect(response.headers.get("location")).toBeDefined();
+        const locationHeader = new URL(
+            response.headers.get("Location") ?? "",
+            "",
+        );
+
+        expect(locationHeader.pathname).toBe("/oauth/consent");
+        expect(locationHeader.searchParams.get("client_id")).toBe(
+            application.clientId,
+        );
+        expect(locationHeader.searchParams.get("redirect_uri")).toBe(
+            "https://example.com",
+        );
+        expect(locationHeader.searchParams.get("response_type")).toBe("code");
+        expect(locationHeader.searchParams.get("scope")).toBe("read write");
+
+        expect(response.headers.get("Set-Cookie")).toMatch(/jwt=[^;]+;/);
+    });
+
+    test("should get a JWT with username", async () => {
+        const formData = new FormData();
+
+        formData.append("identifier", users[0]?.getUser().username ?? "");
+        formData.append("password", passwords[0]);
+
+        const response = await sendTestRequest(
+            new Request(
+                new URL(
+                    `/api/auth/login?client_id=${application.clientId}&redirect_uri=https://example.com&response_type=code&scope=read+write`,
+                    config.http.base_url,
+                ),
+                {
+                    method: "POST",
+                    body: formData,
+                },
+            ),
+        );
+
+        expect(response.status).toBe(302);
+        expect(response.headers.get("location")).toBeDefined();
+        const locationHeader = new URL(
+            response.headers.get("Location") ?? "",
+            "",
+        );
+
+        expect(locationHeader.pathname).toBe("/oauth/consent");
+        expect(locationHeader.searchParams.get("client_id")).toBe(
+            application.clientId,
+        );
+        expect(locationHeader.searchParams.get("redirect_uri")).toBe(
+            "https://example.com",
+        );
+        expect(locationHeader.searchParams.get("response_type")).toBe("code");
+        expect(locationHeader.searchParams.get("scope")).toBe("read write");
+
+        expect(response.headers.get("Set-Cookie")).toMatch(/jwt=[^;]+;/);
+    });
+
+    describe("should reject invalid credentials", async () => {
+        // Redirects to /oauth/authorize on invalid
+        test("invalid email", async () => {
+            const formData = new FormData();
+
+            formData.append("identifier", "ababa@gmail.com");
+            formData.append("password", "password");
+
+            const response = await sendTestRequest(
+                new Request(
+                    new URL(
+                        `/api/auth/login?client_id=${application.clientId}&redirect_uri=https://example.com&response_type=code&scope=read+write`,
+                        config.http.base_url,
+                    ),
+                    {
+                        method: "POST",
+                        body: formData,
+                    },
+                ),
+            );
+
+            expect(response.status).toBe(302);
+            expect(response.headers.get("location")).toBeDefined();
+            const locationHeader = new URL(
+                response.headers.get("Location") ?? "",
+                "",
+            );
+
+            expect(locationHeader.pathname).toBe("/oauth/authorize");
+            expect(locationHeader.searchParams.get("error")).toBe(
+                "invalid_grant",
+            );
+            expect(locationHeader.searchParams.get("error_description")).toBe(
+                "Invalid email or password",
+            );
+
+            expect(response.headers.get("Set-Cookie")).toBeNull();
+        });
+
+        test("invalid username", async () => {
+            const formData = new FormData();
+
+            formData.append("identifier", "ababa");
+            formData.append("password", "password");
+
+            const response = await sendTestRequest(
+                new Request(
+                    new URL(
+                        `/api/auth/login?client_id=${application.clientId}&redirect_uri=https://example.com&response_type=code&scope=read+write`,
+                        config.http.base_url,
+                    ),
+                    {
+                        method: "POST",
+                        body: formData,
+                    },
+                ),
+            );
+
+            expect(response.status).toBe(302);
+            expect(response.headers.get("location")).toBeDefined();
+            const locationHeader = new URL(
+                response.headers.get("Location") ?? "",
+                "",
+            );
+
+            expect(locationHeader.pathname).toBe("/oauth/authorize");
+            expect(locationHeader.searchParams.get("error")).toBe(
+                "invalid_grant",
+            );
+            expect(locationHeader.searchParams.get("error_description")).toBe(
+                "Invalid email or password",
+            );
+
+            expect(response.headers.get("Set-Cookie")).toBeNull();
+        });
+
+        test("invalid password", async () => {
+            const formData = new FormData();
+
+            formData.append("identifier", users[0]?.getUser().email ?? "");
+            formData.append("password", "password");
+
+            const response = await sendTestRequest(
+                new Request(
+                    new URL(
+                        `/api/auth/login?client_id=${application.clientId}&redirect_uri=https://example.com&response_type=code&scope=read+write`,
+                        config.http.base_url,
+                    ),
+                    {
+                        method: "POST",
+                        body: formData,
+                    },
+                ),
+            );
+
+            expect(response.status).toBe(302);
+            expect(response.headers.get("location")).toBeDefined();
+            const locationHeader = new URL(
+                response.headers.get("Location") ?? "",
+                "",
+            );
+
+            expect(locationHeader.pathname).toBe("/oauth/authorize");
+            expect(locationHeader.searchParams.get("error")).toBe(
+                "invalid_grant",
+            );
+            expect(locationHeader.searchParams.get("error_description")).toBe(
+                "Invalid email or password",
+            );
+
+            expect(response.headers.get("Set-Cookie")).toBeNull();
+        });
+    });
+});
diff --git a/server/api/api/auth/login/index.ts b/server/api/api/auth/login/index.ts
index e3096ec3..7485390f 100644
--- a/server/api/api/auth/login/index.ts
+++ b/server/api/api/auth/login/index.ts
@@ -1,7 +1,7 @@
 import { applyConfig, handleZodError } from "@api";
 import { zValidator } from "@hono/zod-validator";
 import { errorResponse, response } from "@response";
-import { eq } from "drizzle-orm";
+import { eq, or } from "drizzle-orm";
 import type { Hono } from "hono";
 import { SignJWT } from "jose";
 import { z } from "zod";
@@ -24,7 +24,11 @@ export const meta = applyConfig({
 
 export const schemas = {
     form: z.object({
-        email: z.string().email().toLowerCase(),
+        identifier: z
+            .string()
+            .email()
+            .toLowerCase()
+            .or(z.string().toLowerCase()),
         password: z.string().min(2).max(100),
     }),
     query: z.object({
@@ -69,7 +73,10 @@ const returnError = (query: object, error: string, description: string) => {
     searchParams.append("error_description", description);
 
     return response(null, 302, {
-        Location: `/oauth/authorize?${searchParams.toString()}`,
+        Location: new URL(
+            `/oauth/authorize?${searchParams.toString()}`,
+            config.http.base_url,
+        ).toString(),
     });
 };
 
@@ -80,12 +87,15 @@ export default (app: Hono) =>
         zValidator("form", schemas.form, handleZodError),
         zValidator("query", schemas.query, handleZodError),
         async (context) => {
-            const { email, password } = context.req.valid("form");
+            const { identifier, password } = context.req.valid("form");
             const { client_id } = context.req.valid("query");
 
             // Find user
             const user = await User.fromSql(
-                eq(Users.email, email.toLowerCase()),
+                or(
+                    eq(Users.email, identifier.toLowerCase()),
+                    eq(Users.username, identifier.toLowerCase()),
+                ),
             );
 
             if (
@@ -97,7 +107,7 @@ export default (app: Hono) =>
             )
                 return returnError(
                     context.req.query(),
-                    "invalid_request",
+                    "invalid_grant",
                     "Invalid email or password",
                 );
 
diff --git a/server/api/api/v1/accounts/:id/statuses.test.ts b/server/api/api/v1/accounts/:id/statuses.test.ts
index 09cc9953..a796589f 100644
--- a/server/api/api/v1/accounts/:id/statuses.test.ts
+++ b/server/api/api/v1/accounts/:id/statuses.test.ts
@@ -19,12 +19,6 @@ afterAll(async () => {
     await deleteUsers();
 });
 
-const getFormData = (object: Record<string, string | number | boolean>) =>
-    Object.keys(object).reduce((formData, key) => {
-        formData.append(key, String(object[key]));
-        return formData;
-    }, new FormData());
-
 beforeAll(async () => {
     const response = await sendTestRequest(
         new Request(
diff --git a/tests/api.test.ts b/tests/api.test.ts
index 1431f1d8..6ec0af04 100644
--- a/tests/api.test.ts
+++ b/tests/api.test.ts
@@ -1,3 +1,6 @@
+/**
+ * @deprecated
+ */
 import { afterAll, beforeAll, describe, expect, test } from "bun:test";
 import { config } from "config-manager";
 import { eq } from "drizzle-orm";
diff --git a/tests/api/accounts.test.ts b/tests/api/accounts.test.ts
index f71b705c..2027c335 100644
--- a/tests/api/accounts.test.ts
+++ b/tests/api/accounts.test.ts
@@ -1,9 +1,11 @@
+/**
+ * @deprecated
+ */
 import { afterAll, describe, expect, test } from "bun:test";
 import { config } from "config-manager";
 import { getTestUsers, sendTestRequest, wrapRelativeUrl } from "~tests/utils";
 import type { Account as APIAccount } from "~types/mastodon/account";
 import type { Relationship as APIRelationship } from "~types/mastodon/relationship";
-import type { Status as APIStatus } from "~types/mastodon/status";
 
 const base_url = config.http.base_url;
 
@@ -105,33 +107,6 @@ describe("API Tests", () => {
         });
     });
 
-    describe("GET /api/v1/accounts/:id/statuses", () => {
-        test("should return the statuses of the specified user", async () => {
-            const response = await sendTestRequest(
-                new Request(
-                    wrapRelativeUrl(
-                        `/api/v1/accounts/${user.id}/statuses`,
-                        base_url,
-                    ),
-                    {
-                        headers: {
-                            Authorization: `Bearer ${token.accessToken}`,
-                        },
-                    },
-                ),
-            );
-
-            expect(response.status).toBe(200);
-            expect(response.headers.get("content-type")).toBe(
-                "application/json",
-            );
-
-            const statuses = (await response.json()) as APIStatus[];
-
-            expect(statuses.length).toBe(0);
-        });
-    });
-
     describe("POST /api/v1/accounts/:id/remove_from_followers", () => {
         test("should remove the specified user from the authenticated user's followers and return an APIRelationship object", async () => {
             const response = await sendTestRequest(
diff --git a/tests/api/statuses.test.ts b/tests/api/statuses.test.ts
index 9e825cd8..deb3391e 100644
--- a/tests/api/statuses.test.ts
+++ b/tests/api/statuses.test.ts
@@ -1,3 +1,6 @@
+/**
+ * @deprecated
+ */
 import { afterAll, describe, expect, test } from "bun:test";
 import { config } from "config-manager";
 import { getTestUsers, sendTestRequest, wrapRelativeUrl } from "~tests/utils";
diff --git a/tests/oauth.test.ts b/tests/oauth.test.ts
index 7f131d0b..670db5a2 100644
--- a/tests/oauth.test.ts
+++ b/tests/oauth.test.ts
@@ -1,13 +1,11 @@
+/**
+ * @deprecated
+ */
 import { afterAll, describe, expect, test } from "bun:test";
 import { config } from "~packages/config-manager";
 import type { Application as APIApplication } from "~types/mastodon/application";
 import type { Token as APIToken } from "~types/mastodon/token";
-import {
-    deleteOldTestUsers,
-    getTestUsers,
-    sendTestRequest,
-    wrapRelativeUrl,
-} from "./utils";
+import { getTestUsers, sendTestRequest, wrapRelativeUrl } from "./utils";
 
 const base_url = config.http.base_url;
 
@@ -70,7 +68,7 @@ describe("POST /api/auth/login/", () => {
     test("should get a JWT", async () => {
         const formData = new FormData();
 
-        formData.append("email", users[0]?.getUser().email ?? "");
+        formData.append("identifier", users[0]?.getUser().email ?? "");
         formData.append("password", passwords[0]);
 
         const response = await sendTestRequest(
@@ -87,21 +85,6 @@ describe("POST /api/auth/login/", () => {
         );
 
         expect(response.status).toBe(302);
-        expect(response.headers.get("location")).toBeDefined();
-        const locationHeader = new URL(
-            response.headers.get("Location") ?? "",
-            "",
-        );
-
-        expect(locationHeader.pathname).toBe("/oauth/consent");
-        expect(locationHeader.searchParams.get("client_id")).toBe(client_id);
-        expect(locationHeader.searchParams.get("redirect_uri")).toBe(
-            "https://example.com",
-        );
-        expect(locationHeader.searchParams.get("response_type")).toBe("code");
-        expect(locationHeader.searchParams.get("scope")).toBe("read write");
-
-        expect(response.headers.get("Set-Cookie")).toMatch(/jwt=[^;]+;/);
 
         jwt =
             response.headers.get("Set-Cookie")?.match(/jwt=([^;]+);/)?.[1] ??