setup test coverage measurement

.coveragerc

@@ -0,0 +1,2 @@
+[run]
+branch = True

.gitignore

@@ -5,3 +5,5 @@ homeassistant/**
 tsun_proxy/**
 Doku/**
 .DS_Store
+.coverage
+coverage.xml

.vscode/settings.json

@@ -1,7 +1,11 @@
 {
     "python.testing.pytestArgs": [
-        "-vv",
-        "app","system_tests"
+        "-vv", 
+        "app",
+        "--cov=app/src",
+        "--cov-report=xml",
+        "--cov-report=html",
+        "system_tests"
     ],
     "python.testing.unittestEnabled": false,
     "python.testing.pytestEnabled": true