Add test for server

A test fixture to start the server and a first test case is added.

The fixture tries to assure that the server is installed and running.
If it is not installed the fixture uses pip to install it.

The server and the installation by pip is run bei the same Python
executable that also runs pytest.

The github workflow for pytest is adapted to install akkudoktor-eos.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

tests/conftest.py

@@ -0,0 +1,53 @@
+import os
+import subprocess
+import sys
+
+import pytest
+from xprocess import ProcessStarter
+
+
+@pytest.fixture
+def server(xprocess):
+    class Starter(ProcessStarter):
+        # assure server to be installed
+        try:
+            subprocess.run(
+                [sys.executable, "-c", "import akkudoktoreosserver"],
+                check=True,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+        except subprocess.CalledProcessError:
+            test_dir = os.path.dirname(os.path.realpath(__file__))
+            project_dir = os.path.abspath(os.path.join(test_dir, ".."))
+            subprocess.run(
+                [sys.executable, "-m", "pip", "install", "-e", project_dir],
+                check=True,
+                stdout=subprocess.PIPE,
+                stderr=subprocess.PIPE,
+            )
+
+        # command to start server process
+        args = [sys.executable, "-m", "akkudoktoreosserver.flask_server"]
+
+        # startup pattern
+        pattern = "Serving Flask app 'flask_server'"
+        # search the first 12 lines for the startup pattern, if not found
+        # a RuntimeError will be raised informing the user
+        max_read_lines = 12
+
+        # will wait for 10 seconds before timing out
+        timeout = 10
+
+        # xprocess will now attempt to clean up upon interruptions
+        terminate_on_interrupt = True
+
+    # ensure process is running and return its logfile
+    logfile = xprocess.ensure("akkudoktoreosserver", Starter)
+
+    # create url/port info to the server
+    url = "http://127.0.0.1:8503"
+    yield url
+
+    # clean up whole process tree afterwards
+    xprocess.getinfo("akkudoktoreosserver").terminate()

tests/test_server.py

@@ -0,0 +1,63 @@
+import requests
+
+
+def test_server(server):
+    """
+    Test the server
+    """
+    result = requests.get(f"{server}/gesamtlast_simple?year_energy=2000&")
+    assert result.status_code == 200
+    assert (
+        result.text
+        == """[
+  0.12399409965368197,
+  0.12082955072761034,
+  0.1186152098599658,
+  0.13282048719613798,
+  0.16801614895243458,
+  0.18833079485066814,
+  0.2060958576163904,
+  0.23815979421159755,
+  0.256794470747979,
+  0.2730286944402595,
+  0.2837831370699189,
+  0.2880791113592318,
+  0.27868845536305187,
+  0.2593976275300202,
+  0.26565341182134644,
+  0.2834322084492842,
+  0.3385133447353511,
+  0.36541124595269503,
+  0.33781770981176945,
+  0.29218838246014817,
+  0.24535542466592053,
+  0.19484917288665324,
+  0.15634028941335018,
+  0.13309410380383394,
+  0.1239736903705896,
+  0.12074280282759843,
+  0.11849705069574769,
+  0.1320224904313182,
+  0.16699106562771282,
+  0.18856343364342354,
+  0.20578134176859084,
+  0.23760516695843145,
+  0.25675411140321175,
+  0.2729442256919556,
+  0.2837782018548114,
+  0.2882881388086184,
+  0.2800061651414149,
+  0.26039842637914645,
+  0.26613497240454587,
+  0.28441116400389416,
+  0.33941195977626437,
+  0.36621100374643395,
+  0.3391062422788601,
+  0.29391186081171267,
+  0.24686897327498972,
+  0.19620626090788126,
+  0.1570820352949701,
+  0.13332596485058107
+]
+"""
+    )