Add test configuration and parser/language detector tests

tests/conftest.py

@@ -0,0 +1,93 @@
+"""Pytest configuration and fixtures for gdiffer tests."""
+
+import sys
+from pathlib import Path
+
+import pytest
+
+sys.path.insert(0, str(Path(__file__).parent.parent / 'src'))
+
+
+@pytest.fixture
+def sample_diff():
+    return """diff --git a/src/main.py b/src/main.py
+index 1234567..89abcde 100644
+--- a/src/main.py
++++ b/src/main.py
+@@ -1,10 +1,12 @@
++import os
++import sys
+ def main():
+-    print("Hello")
++    print("Hello, World!")
+     for i in range(10):
+         print(i)
++    return 0
+ """
+
+
+@pytest.fixture
+def multi_file_diff():
+    return """diff --git a/app.py b/app.py
+new file mode 100644
+index 0000000..1234567
+--- /dev/null
++++ b/app.py
+@@ -0,0 +1,5 @@
++def app():
++    return "Hello"
++
+diff --git a/lib.py b/lib.py
+deleted file mode 100644
+index 789abc..def123
+--- a/lib.py
++++ /dev/null
+@@ -1,5 +0,0 @@
+-def lib():
+-    return "World"
+-
+diff --git a/utils.py b/utils.py
+index abc123..xyz789 100644
+--- a/utils.py
++++ b/utils.py
+@@ -1,3 +1,5 @@
++import os
+ def helper():
+     return True
++
++def new_func(): pass
+"""
+
+
+@pytest.fixture
+def sql_injection_diff():
+    return """diff --git a/db.py b/db.py
+@@ -10,5 +10,6 @@ def get_user(username):
+     query = "SELECT * FROM users WHERE name = '" + username + "'"
+     return execute_query(query)
++    query = "SELECT * FROM users WHERE id = " + user_id
+"""
+
+
+@pytest.fixture
+def diff_parser():
+    from gdiffer.parser import DiffParser
+    return DiffParser()
+
+
+@pytest.fixture
+def language_detector():
+    from gdiffer.language_detector import LanguageDetector
+    return LanguageDetector()
+
+
+@pytest.fixture
+def code_analyzer():
+    from gdiffer.code_analyzer import CodeAnalyzer
+    return CodeAnalyzer()
+
+
+@pytest.fixture
+def issue_detector():
+    from gdiffer.issue_detector import IssueDetector
+    return IssueDetector()