S allius/issue217 2 (#230)

* add some reader classes to get the configuration

* adapt unittests

* get config from json or toml file

* loop over all config readers to get the configuration

* rename config test files

* use relative paths for coverage test in vscode

* do not throw an error for missing config files

* remove obsolete tests

* use dotted key notation for pv sub dictonary

* log config reading progress

* remove create_config_toml.py

* remove obsolete tests for the ha_addon

* disable mosquitto tests if the server is down

* ignore main method for test coverage

* increase test coverage

* pytest-cov: use relative_files only on github, so coverage will work with vscode locally

* remove unneeded imports

* add missing test cases

* disable branch coverage, cause its not reachable

app/tests/test_config_read_env.py

@@ -0,0 +1,53 @@
+# test_with_pytest.py
+import pytest
+import os
+from mock import patch
+from cnf.config import Config
+from cnf.config_read_toml import ConfigReadToml
+from cnf.config_read_env import ConfigReadEnv
+
+def patch_getenv():
+    def new_getenv(key: str, defval=None):
+        """Get an environment variable, return None if it doesn't exist.
+The optional second argument can specify an alternate default. key,
+default and the result are str."""
+        if key == 'MQTT_PASSWORD':
+            return 'passwd'
+        elif key == 'MQTT_PORT':
+            return 1234
+        elif key == 'MQTT_HOST':
+            return ""
+        return defval
+
+    with patch.object(os, 'getenv', new_getenv) as conn:
+        yield conn
+
+def test_extend_key():
+    cnf_rd = ConfigReadEnv()
+
+    conf = {}
+    cnf_rd._extend_key(conf, "mqtt.user", "testuser")
+    assert conf == {
+        'mqtt': {
+            'user': 'testuser',
+        },
+    }
+
+    conf = {}
+    cnf_rd._extend_key(conf, "mqtt", "testuser")
+    assert conf == {
+        'mqtt': 'testuser',
+    }
+
+    conf = {}
+    cnf_rd._extend_key(conf, "", "testuser")
+    assert conf == {'': 'testuser'}
+
+def test_read_env_config():
+    Config.init(ConfigReadToml("app/config/default_config.toml"))
+    assert Config.get('mqtt') == {'host': 'mqtt', 'port': 1883, 'user': None, 'passwd': None}
+    for _ in patch_getenv():
+
+        ConfigReadEnv()
+    assert Config.get_error() == None
+    assert Config.get('mqtt') == {'host': 'mqtt', 'port': 1234, 'user': None, 'passwd': 'passwd'}