tests: Cleanup some pylint errors and share common fixture

- Cleanup some of the pylint erros in the tests
- Reorganize some of the tests functions and fixtures
- Move the one common fixture to conftest.py for sharing

tests/conftest.py

@@ -0,0 +1,27 @@
+# encoding: utf-8
+import sys
+import os
+from tempfile import NamedTemporaryFile
+import pytest
+
+# Only import HOMETRASH on supported platforms
+if sys.platform != "win32":
+    from send2trash.plat_other import HOMETRASH
+
+
+@pytest.fixture(name="test_file")
+def fixture_test_file():
+    file = NamedTemporaryFile(dir=os.path.expanduser("~"), prefix="send2trash_test", delete=False)
+    file.close()
+    # Verify file was actually created
+    assert os.path.exists(file.name) is True
+    yield file.name
+    # Cleanup trash files on supported platforms
+    if sys.platform != "win32":
+        name = os.path.basename(file.name)
+        # Remove trash files if they exist
+        if os.path.exists(os.path.join(HOMETRASH, "files", name)):
+            os.remove(os.path.join(HOMETRASH, "files", name))
+            os.remove(os.path.join(HOMETRASH, "info", name + ".trashinfo"))
+    if os.path.exists(file.name):
+        os.remove(file.name)