diff --git a/src/habitmove/parser.py b/src/habitmove/parser.py
index f33499e..61141dd 100644
--- a/src/habitmove/parser.py
+++ b/src/habitmove/parser.py
@@ -1,11 +1,16 @@
-from habitmove.nomiedata import Event, Tracker
+from __future__ import annotations
+
+from habitmove.nomiedata import Event, ImportData, Tracker
 
 
 class Parser:
-    def __init__(self, path: str, filename: str) -> None:
+    def parse(self, path: str, filename: str) -> ImportData:
         """Load in a data set"""
-        self.path = path
-        self.filename = filename
+        raise NotImplementedError
+
+    def extract_version(self) -> str:
+        """Extract import dataset version from the data set"""
+        raise NotImplementedError
 
     def extract_trackers(self) -> list[Tracker]:
         """Extract trackers from the data set"""
@@ -14,3 +19,7 @@ class Parser:
     def extract_events(self) -> list[Event]:
         """Extract events from the data set"""
         raise NotImplementedError
+
+
+class NomieParser(Parser):
+    pass
diff --git a/tests/test_parser.py b/tests/test_parser.py
new file mode 100644
index 0000000..55cef76
--- /dev/null
+++ b/tests/test_parser.py
@@ -0,0 +1,19 @@
+from habitmove.parser import Parser, NomieParser
+
+
+def test_parser_interface_exists():
+    sut = Parser()
+    assert type(sut) == Parser
+
+
+def test_parser_interface_contains_methods():
+    sut = Parser()
+    assert sut.__getattribute__("parse") != None
+    assert sut.__getattribute__("extract_version") != None
+    assert sut.__getattribute__("extract_trackers") != None
+    assert sut.__getattribute__("extract_events") != None
+
+
+def test_nomie_parser_exists():
+    sut = NomieParser()
+    assert type(sut) == NomieParser