diff --git a/requirements.txt b/requirements.txt
index 1039e439..9f9ae960 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,3 +16,4 @@ async_timeout
 uvicorn
 fastapi
 pydantic_settings
+httpx
diff --git a/tests/api_tests/test_api.py b/tests/api_tests/test_api.py
new file mode 100644
index 00000000..08c68139
--- /dev/null
+++ b/tests/api_tests/test_api.py
@@ -0,0 +1,152 @@
+import pytest
+from fastapi.testclient import TestClient
+
+from api.app.api import app
+
+
+expected_prediction_key = "power_kw"
+expected_dict_keys = ["timestamp", "predictions"] 
+prediction_key = expected_dict_keys[1]
+expected_number_of_values = 192
+expected_response_on_wrong_types = {
+    "detail": [
+        {
+            "loc": ["body","site", "latitude"],
+            "msg": "Input should be less than or equal to 90",
+            "type": "less_than_equal",
+            "input": 91,
+            "ctx": {"le": 90.0},
+        },
+        {
+            "loc": ["body", "site", "longitude"],
+            "msg": "Input should be greater than or equal to -180",
+            "type": "greater_than_equal",
+            "input": -181,
+            "ctx": {"ge": -180.0},
+        },
+        {
+            "loc": ["body","site", "capacity_kwp"],
+            "msg": "Input should be greater than or equal to 0",
+            "type": "greater_than_equal",
+            "input": -1,
+            "ctx": {"ge": 0.0},
+        },
+        {
+            "loc": ["body","site", "tilt"],
+            "msg": "Input should be less than or equal to 90",
+            "type": "less_than_equal",
+            "input": 91,
+            "ctx": {"le": 90.0},
+        },
+        {
+            "loc": ["body","site", "orientation"],
+            "msg": "Input should be less than or equal to 360",
+            "type": "less_than_equal",
+            "input": 361,
+            "ctx": {"le": 360.0},
+        },
+    ]
+}
+
+
+@pytest.fixture
+def client():
+    return TestClient(app)
+
+
+@pytest.fixture
+def body():
+    return {
+        "site":{
+            "latitude": -90,
+            "longitude": -180,
+            "capacity_kwp": 0,
+            "tilt": 35,
+            "orientation": 180,
+            "inverter_type": "string",
+            },
+        "timestamp": "2021-01-26 01:15:00",
+    }
+
+
+@pytest.fixture
+def body_short():
+    return {
+        "site":{
+            "latitude": -90,
+            "longitude": -180,
+            "capacity_kwp": 0,
+            },
+        "timestamp": "2021-01-26 01:15:00",
+    }
+
+
+@pytest.fixture
+def body_wrong():
+    return {
+        "site":{
+            "latitude": 91,
+            "longitude": -181,
+            "capacity_kwp": -1,
+            "tilt": 91,
+            "orientation": 361,
+            "inverter_type": "string",
+        },
+        "timestamp": "2021-01-26 01:15:00",
+    }
+
+@pytest.fixture
+def bad_redirect_url(client):
+    return "url"
+
+@pytest.fixture
+def bad_redirect_url_correct_param(client):
+    return "url?code=code"
+
+def test_api_ok(client, body):
+    response = client.post("/forecast/", json=body)
+    response_body = response.json()
+    assert response.status_code == 200
+    assert isinstance(response_body[prediction_key][expected_prediction_key], dict)
+    assert all([key in response_body.keys() for key in expected_dict_keys]), "Expected dictonary key is missing"
+    assert len(response_body[prediction_key][expected_prediction_key]) == expected_number_of_values, "Expected number of values is wrong"
+
+
+def test_api_ok_short(client, body_short):
+    response = client.post("/forecast/", json=body_short)
+    response_body = response.json()
+
+    assert response.status_code == 200
+    assert isinstance(response_body[prediction_key][expected_prediction_key], dict)
+    assert all([key in response_body.keys() for key in expected_dict_keys]), "Expected dictonary key is missing"
+    assert len(response_body[prediction_key][expected_prediction_key]) == expected_number_of_values
+
+
+def test_api_wrong_body(client, body_wrong):
+    # Tests all wrong data types responses
+    response = client.post("/forecast/", json=body_wrong)
+    response_body = response.json()
+
+    assert response.status_code == 422
+    assert response_body == expected_response_on_wrong_types
+
+@pytest.mark.skip('There needs to be some extra mocking here')
+def test_getenphse_authorization_url(client):
+    response = client.get("/solar_inverters/enphase/auth_url")
+    assert response.status_code == 200
+    assert isinstance(response.json()["auth_url"], str)
+
+@pytest.mark.skip('There needs to be some extra mocking here')
+def test_getenphse_token_and_system_id_bad_redirect_url(client, bad_redirect_url):
+
+    response = client.post("/solar_inverters/enphase/token_and_id", json={"redirect_url": bad_redirect_url})
+    response_body = response.json()
+    assert response.status_code == 400
+    assert response_body['detail'] == 'Invalid redirect URL'
+
+@pytest.mark.skip('There needs to be some extra mocking here')
+def test_getenphse_token_and_system_id_bad_redirect_url(client, bad_redirect_url_correct_param):
+    response = client.post("/solar_inverters/enphase/token_and_id", json={"redirect_url": bad_redirect_url_correct_param})
+    response_body = response.json()
+    assert response.status_code == 400
+    assert  'Error getting access token and system ID: ' in response_body['detail']