reorganization of tests (1 route per file), add some basic tests

tests/test_api/test_api_detect_language.py

@@ -0,0 +1,26 @@
+import json
+
+
+def test_api_detect_language(client):
+    response = client.post("/detect", data={
+        "q": "Hello"
+    })
+    response_json = json.loads(response.data)
+
+    assert "confidence" in response_json[0] and "language" in response_json[0]
+    assert len(response_json) >= 1
+    assert response.status_code == 200
+
+
+def test_api_detect_language_must_fail_without_parameters(client):
+    response = client.post("/detect")
+    response_json = json.loads(response.data)
+
+    assert "error" in response_json
+    assert response.status_code == 400
+
+
+def test_api_detect_language_must_fail_bad_request_type(client):
+    response = client.get("/detect")
+
+    assert response.status_code == 405