refactor(analyzer): improve analyzer pipeline module (#1542)

* rename steps to pipeline module

* move pipeline entrypoint to pipeline module

* rename steps test module to pipeline

* fix paths after renames

* move step protocol to pipeline

* create pipeline status enum

* use Protocol from typing extensions

* Fix linting

analyzer/tests/pipeline/pipeline_test.py

@@ -0,0 +1,48 @@
+import datetime
+import os
+from queue import Queue
+
+import pytest
+
+from libretime_analyzer.pipeline import Pipeline
+
+from ..conftest import AUDIO_FILENAME, AUDIO_IMPORT_DEST
+
+
+def test_run_analysis(src_dir, dest_dir):
+    queue = Queue()
+    Pipeline.run_analysis(
+        queue,
+        os.path.join(src_dir, AUDIO_FILENAME),
+        dest_dir,
+        AUDIO_FILENAME,
+        "file",
+        "",
+    )
+    metadata = queue.get()
+
+    assert metadata["track_title"] == "Test Title"
+    assert metadata["artist_name"] == "Test Artist"
+    assert metadata["album_title"] == "Test Album"
+    assert metadata["year"] == "1999"
+    assert metadata["genre"] == "Test Genre"
+    assert metadata["mime"] == "audio/mp3"
+    assert metadata["length_seconds"] == pytest.approx(15.0, abs=0.1)
+    assert metadata["length"] == str(
+        datetime.timedelta(seconds=metadata["length_seconds"])
+    )
+    assert os.path.exists(os.path.join(dest_dir, AUDIO_IMPORT_DEST))
+
+
+@pytest.mark.parametrize(
+    "params,exception",
+    [
+        ((Queue(), "", "", ""), TypeError),
+        ((Queue(), "", "", ""), TypeError),
+        ((Queue(), "", "", ""), TypeError),
+        ((Queue(), "", "", ""), TypeError),
+    ],
+)
+def test_run_analysis_wrong_params(params, exception):
+    with pytest.raises(exception):
+        Pipeline.run_analysis(*params)