diff --git a/Justfile b/Justfile
index 9f62128..6b05875 100644
--- a/Justfile
+++ b/Justfile
@@ -17,7 +17,8 @@ preview:
 	bunx --bun concurrently --kill-others "rye run sanic server --port 8070 --host 0.0.0.0" "bunx --bun vite preview --port 8071 --host 0.0.0.0"
 
 test:
-	bun test #TODO: proper test setup
+	bun test
+	rye test
 
 lint:
 	bunx --bun prettier --check .
diff --git a/bun-svelte.ts b/bun-svelte.ts
new file mode 100644
index 0000000..4977a8d
--- /dev/null
+++ b/bun-svelte.ts
@@ -0,0 +1,24 @@
+import { plugin } from "bun"
+
+await plugin({
+	name: "svelte loader",
+	async setup(build) {
+		const { compile } = await import("svelte/compiler")
+
+		// when a .svelte file is imported...
+		build.onLoad({ filter: /\.svelte$/ }, async ({ path }) => {
+			// read and compile it with the Svelte compiler
+			const file = await Bun.file(path).text()
+			const contents = compile(file, {
+				filename: path,
+				generate: "client",
+			}).js.code
+
+			// and return the compiled source code as "js"
+			return {
+				contents,
+				loader: "js",
+			}
+		})
+	},
+})
diff --git a/bun.lockb b/bun.lockb
index b745217..0c30887 100755
Binary files a/bun.lockb and b/bun.lockb differ
diff --git a/bun_setup.ts b/bun_setup.ts
new file mode 100644
index 0000000..dcdf8db
--- /dev/null
+++ b/bun_setup.ts
@@ -0,0 +1,40 @@
+import { GlobalRegistrator } from "@happy-dom/global-registrator"
+import { vitePreprocess } from "@sveltejs/vite-plugin-svelte"
+import { plugin } from "bun"
+import { afterEach, expect } from "bun:test"
+import { cleanup } from "@testing-library/svelte"
+import * as matchers from "@testing-library/jest-dom/matchers"
+
+expect.extend(matchers)
+
+afterEach(() => {
+	cleanup()
+})
+
+const oldConsole = console
+GlobalRegistrator.register()
+window.console = oldConsole
+
+await plugin({
+	name: "svelte loader",
+	async setup(builder) {
+		const { compile, preprocess } = await import("svelte/compiler")
+		const { readFileSync } = await import("fs")
+
+		builder.onLoad({ filter: /\.svelte$/ }, async ({ path }) => {
+			return {
+				// Use the preprocessor of your choice.
+				contents: compile(
+					await preprocess(readFileSync(path, "utf8"), vitePreprocess()).then(
+						(processed) => processed.code,
+					),
+					{
+						filename: path,
+						generate: "client",
+					},
+				).js.code,
+				loader: "js",
+			}
+		})
+	},
+})
diff --git a/bunfig.toml b/bunfig.toml
new file mode 100644
index 0000000..3ff377f
--- /dev/null
+++ b/bunfig.toml
@@ -0,0 +1,2 @@
+[test]
+preload = ["./bun_setup.ts"]
\ No newline at end of file
diff --git a/happydom.ts b/happydom.ts
new file mode 100644
index 0000000..ce01084
--- /dev/null
+++ b/happydom.ts
@@ -0,0 +1,3 @@
+import { GlobalRegistrator } from "@happy-dom/global-registrator"
+
+GlobalRegistrator.register()
diff --git a/matchers.d.ts b/matchers.d.ts
new file mode 100644
index 0000000..0f19f03
--- /dev/null
+++ b/matchers.d.ts
@@ -0,0 +1,7 @@
+import { AsymmetricMatchers, Matchers } from "bun:test"
+import type { TestingLibraryMatchers } from "@testing-library/jest-dom/matchers"
+
+declare module "bun:test" {
+	interface Matchers<T> extends TestingLibraryMatchers<typeof expect.stringContaining, T> {}
+	interface AsymmetricMatchers extends TestingLibraryMatchers {}
+}
diff --git a/package.json b/package.json
index 05e4fcf..d69720a 100644
--- a/package.json
+++ b/package.json
@@ -4,12 +4,17 @@
 	"private": true,
 	"license": "ISC",
 	"devDependencies": {
+		"@happy-dom/global-registrator": "^15.7.4",
 		"@sveltejs/adapter-auto": "^3.2.5",
 		"@sveltejs/kit": "^2.7.1",
 		"@sveltejs/vite-plugin-svelte": "^4.0.0-next.6",
+		"@testing-library/dom": "^10.4.0",
+		"@testing-library/jest-dom": "^6.6.2",
+		"@testing-library/svelte": "^5.2.4",
+		"@types/bun": "^1.1.11",
 		"@types/eslint": "^9.6.1",
 		"concurrently": "^9.0.1",
-		"eslint": "^9.12.0",
+		"eslint": "^9.13.0",
 		"eslint-config-prettier": "^9.1.0",
 		"eslint-plugin-svelte": "^2.45.1",
 		"globals": "^15.11.0",
@@ -19,9 +24,8 @@
 		"svelte-check": "^4.0.5",
 		"tslib": "^2.8.0",
 		"typescript": "^5.6.3",
-		"typescript-eslint": "^8.9.0",
-		"vite": "^5.4.9",
-		"vitest": "^2.1.3"
+		"typescript-eslint": "^8.10.0",
+		"vite": "^5.4.9"
 	},
 	"type": "module"
 }
diff --git a/pyproject.toml b/pyproject.toml
index 825a000..ade0db2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,11 +18,20 @@ build-backend = "hatchling.build"
 
 [tool.rye]
 managed = true
-dev-dependencies = []
+dev-dependencies = [
+    "pytest>=8.3.3",
+]
 
 [tool.ruff]
 format.indent-style = "tab"
 
+[tool.pytest.ini_options]
+minversion = "6.0"
+addopts = "-ra -q"
+testpaths = [
+    "src",
+]
+
 [tool.hatch.metadata]
 allow-direct-references = true
 
diff --git a/requirements-dev.lock b/requirements-dev.lock
index 3007e31..25a9afc 100644
--- a/requirements-dev.lock
+++ b/requirements-dev.lock
@@ -17,12 +17,19 @@ html5tagger==1.3.0
     # via tracerite
 httptools==0.6.2
     # via sanic
+iniconfig==2.0.0
+    # via pytest
 multidict==6.1.0
     # via sanic
 mypy==1.12.0
     # via aigis
 mypy-extensions==1.0.0
     # via mypy
+packaging==24.1
+    # via pytest
+pluggy==1.5.0
+    # via pytest
+pytest==8.3.3
 sanic==24.6.0
     # via aigis
 sanic-routing==23.12.0
diff --git a/src/aigis/test_1plus2.py b/src/aigis/test_1plus2.py
new file mode 100644
index 0000000..e5207d7
--- /dev/null
+++ b/src/aigis/test_1plus2.py
@@ -0,0 +1,5 @@
+import pytest
+
+
+def test_1plus2():
+	assert 1 + 2 == 3
diff --git a/src/index.test.ts b/src/index.test.ts
index 316e4cd..824c58c 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -1,7 +1,17 @@
-import { describe, it, expect } from "vitest"
+import { describe, it, expect } from "bun:test"
+import page from "./routes/+page.svelte"
+import { screen, render } from "@testing-library/svelte"
 
 describe("sum test", () => {
 	it("adds 1 + 2 to equal 3", () => {
 		expect(1 + 2).toBe(3)
 	})
 })
+
+describe("root page test", () => {
+	it("has the correct header", async () => {
+		render(page)
+		const header = await screen.findByRole("heading")
+		expect(header).toBeDefined()
+	})
+})
diff --git a/testing-library.ts b/testing-library.ts
new file mode 100644
index 0000000..9fffb23
--- /dev/null
+++ b/testing-library.ts
@@ -0,0 +1,9 @@
+import { afterEach, expect } from "bun:test"
+import { cleanup } from "@testing-library/svelte"
+import * as matchers from "@testing-library/jest-dom/matchers"
+
+expect.extend(matchers)
+
+afterEach(() => {
+	cleanup()
+})
diff --git a/vite.config.ts b/vite.config.ts
index 04fd695..7b72a3c 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,11 +1,8 @@
 import { sveltekit } from "@sveltejs/kit/vite"
-import { defineConfig } from "vitest/config"
+import { defineConfig } from "vite"
 
 export default defineConfig({
 	plugins: [sveltekit()],
-	test: {
-		include: ["src/**/*.{test,spec}.{js,ts}"],
-	},
 	server: {
 		watch: {
 			ignored: ["**/__pycache__/**", "**/.*_cache/**", "**/.venv/**", "**/.direnv/**"],