gitignore update and update tests for multithread search (spotDL#1398)

* Add test coverage file to gitignore

Also remove old .cache

* Change tests to run with 1 search thread

Author: Silverarmor

.gitignore

@@ -48,5 +48,5 @@ dist
 # Tox
 .tox/
 
-# Cache
-.cache
+# Test Coverage
+.coverage

tests/test_entry_point.py

@@ -85,6 +85,7 @@ def test_download_an_album(capsys, patch_dependencies, monkeypatch):
         [
             "dummy",
             "https://open.spotify.com/album/2YMWspDGtbDgYULXvVQFM6?si=gF5dOQm8QUSo-NdZVsFjAQ",
+            "--search-threads=1",
         ],
     )
 
@@ -109,6 +110,7 @@ def test_download_a_playlist(capsys, patch_dependencies, monkeypatch):
         [
             "dummy",
             "https://open.spotify.com/playlist/0slbokxiWCo9egF9UhVmmI",
+            "--search-threads=1"
         ],
     )