Run integration test by using pypputeer

.gitignore

@@ -12,3 +12,4 @@ public/
 
 *.sqlite3
 *.db
+*.png

integration_tests.py

@@ -0,0 +1,66 @@
+import asyncio
+import optuna
+import time
+import threading
+
+from optuna_dashboard.app import create_app
+from pyppeteer import launch
+from pyppeteer.browser import Browser
+from wsgiref.simple_server import make_server
+
+
+host = "127.0.0.1"
+port = 8080
+
+
+async def take_screenshot(browser: Browser, url: str, path: str):
+    page = await browser.newPage()
+    await page.setViewport({'width': 1200, 'height': 3000})
+    await page.goto(url)
+    time.sleep(5)
+    await page.screenshot({'path': path})
+
+
+async def integration_test_main():
+    browser = await launch()
+    await take_screenshot(browser, f'http://{host}:{port}/dashboard/', 'study_list.png')
+    await take_screenshot(browser, f'http://{host}:{port}/dashboard/studies/0', 'study_detail_0.png')
+    await take_screenshot(browser, f'http://{host}:{port}/dashboard/studies/1', 'study_detail_1.png')
+    await browser.close()
+
+
+def run_optuna() -> optuna.storages.InMemoryStorage:
+    storage = optuna.storages.InMemoryStorage()
+
+    # study 0
+    study0 = optuna.create_study(study_name="example-0", storage=storage)
+
+    def objective(trial: optuna.Trial) -> float:
+        x1 = trial.suggest_float("x1", 0, 10)
+        x2 = trial.suggest_float("x2", 0, 10)
+        return (x1 - 2) ** 2 + (x2 - 5) ** 2
+
+    study0.optimize(objective, n_trials=100)
+
+    # study 1 - no trials
+    optuna.create_study(study_name="example-1", storage=storage)
+    return storage
+
+
+def main():
+    storage = run_optuna()
+    app = create_app(storage)
+
+    httpd = make_server(host, port, app)
+    thread = threading.Thread(target=httpd.serve_forever)
+    thread.start()
+
+    asyncio.get_event_loop().run_until_complete(integration_test_main())
+
+    httpd.shutdown()
+    httpd.server_close()
+    thread.join()
+
+
+if __name__ == '__main__':
+    main()