Search by image at path only if query of form "file:/path/to/image"

Previously no query syntax helpers, like the "file:" prefix, were used
before checking if query contains file path.

This made query to image search brittle to misinterpretation and
pointless checking

Add test to verify search by image at file works as expected

tests/test_image_search.py

@@ -1,4 +1,5 @@
 # Standard Modules
+import logging
 from pathlib import Path
 from PIL import Image
 
@@ -77,3 +78,42 @@ def test_image_search(content_config: ContentConfig, search_config: SearchConfig
     # Cleanup
     # Delete the image files copied to results directory
     actual_image_path.unlink()
+
+
+# ----------------------------------------------------------------------------------------------------
+def test_image_search_by_filepath(content_config: ContentConfig, search_config: SearchConfig, caplog):
+    # Arrange
+    output_directory = resolve_absolute_path(web_directory)
+    model.image_search = image_search.setup(content_config.image, search_config.image, regenerate=False)
+    image_directory = content_config.image.input_directories[0]
+
+    query = f"file:{image_directory.joinpath('kitten_park.jpg')}"
+    expected_image_path = f"{image_directory.joinpath('kitten_park.jpg')}"
+
+    # Act
+    with caplog.at_level(logging.INFO, logger="src.search_type.image_search"):
+        hits = image_search.query(
+            query,
+            count = 1,
+            model = model.image_search)
+
+        results = image_search.collate_results(
+            hits,
+            model.image_search.image_names,
+            output_directory=output_directory,
+            image_files_url='/static/images',
+            count=1)
+
+    actual_image_path = output_directory.joinpath(Path(results[0].entry).name)
+    actual_image = Image.open(actual_image_path)
+    expected_image = Image.open(expected_image_path)
+
+    # Assert
+    # Ensure file search triggered instead of query with file path as string
+    assert f"Find Images by Image: {resolve_absolute_path(expected_image_path)}" in caplog.text, "File search not triggered"
+    # Ensure the correct image is returned
+    assert expected_image == actual_image, "Incorrect image returned by file search"
+
+    # Cleanup
+    # Delete the image files copied to results directory
+    actual_image_path.unlink()