Add signature checking

tests/test_parser.py

@@ -1,4 +1,5 @@
 from habitmove.parser import Parser, NomieParser
+from inspect import signature
 
 
 def test_parser_interface_exists():
@@ -9,11 +10,37 @@ def test_parser_interface_exists():
 def test_parser_interface_contains_methods():
     sut = Parser()
     assert sut.__getattribute__("parse") != None
+    assert sut.__getattribute__("load_file") != None
     assert sut.__getattribute__("extract_version") != None
     assert sut.__getattribute__("extract_trackers") != None
     assert sut.__getattribute__("extract_events") != None
 
 
+def test_parser_load_file_returns_parser():
+    sut = Parser().load_file
+    assert signature(sut).return_annotation == "Parser"
+
+
+def test_parser_parse_returns_Import_Data():
+    sut = Parser().parse
+    assert signature(sut).return_annotation == "ImportData"
+
+
+def test_parser_version_returns_String():
+    sut = Parser().extract_version
+    assert signature(sut).return_annotation == "str"
+
+
+def test_parser_extract_trackers_returns_tracker_list():
+    sut = Parser().extract_trackers
+    assert signature(sut).return_annotation == "list[Tracker]"
+
+
+def test_parser_extract_events_returns_event_list():
+    sut = Parser().extract_events
+    assert signature(sut).return_annotation == "list[Event]"
+
+
 def test_nomie_parser_exists():
     sut = NomieParser()
     assert type(sut) == NomieParser