fix: fix directory structure and test files

tests/test.tampy

@@ -0,0 +1,6 @@
+x = 1
+y = 2
+if x > y:
+    print("x is greater")
+else:
+    print("y is greater")

tests/test_cli.py

@@ -9,19 +9,20 @@ from pathlib import Path
 def test_build_command():
     """Test build command."""
     result = subprocess.run(
-        [sys.executable, "-m", "tampy", "build", "test.tampy"],
+        [sys.executable, "-m", "tampy", "build", "tests/test.tampy"],
         capture_output=True,
         text=True,
         env={**dict(os.environ), "PYTHONPATH": "src"}
     )
     assert result.returncode == 0
     assert "Generated:" in result.stdout
+    assert Path("tests/test.py").exists()
 
 
 def test_run_command():
     """Test run command."""
     result = subprocess.run(
-        [sys.executable, "-m", "tampy", "run", "test.tampy"],
+        [sys.executable, "-m", "tampy", "run", "tests/test.tampy"],
         capture_output=True,
         text=True,
         env={**dict(os.environ), "PYTHONPATH": "src"}
@@ -33,10 +34,10 @@ def test_run_command():
 def test_file_extension_replacement():
     """Test that .tampy is replaced with .py."""
     result = subprocess.run(
-        [sys.executable, "-m", "tampy", "build", "test.tampy"],
+        [sys.executable, "-m", "tampy", "build", "tests/test.tampy"],
         capture_output=True,
         text=True,
         env={**dict(os.environ), "PYTHONPATH": "src"}
     )
     assert result.returncode == 0
-    assert Path("test.py").exists()
+    assert Path("tests/test.py").exists()