ulwgl_test: add tests for cache

ulwgl_test.py

@@ -100,6 +100,120 @@ class TestGameLauncher(unittest.TestCase):
         if self.test_proton_dir.exists():
             rmtree(self.test_proton_dir.as_posix())
 
+    def test_cache_interrupt(self):
+        """Test _get_from_cache on keyboard interrupt."""
+        result = None
+        # In the real usage, should be populated after successful callout for latest Proton releases
+        # Just mock it and assumes its the latest
+        files = [("", ""), (self.test_archive.name, "")]
+
+        # Populate the Steam compat dir by extracting the tarball
+        ulwgl_dl_util._extract_dir(self.test_archive, self.test_compat)
+
+        self.assertTrue(
+            self.test_compat.joinpath(
+                self.test_archive.name[: self.test_archive.name.find(".tar.gz")]
+            ).exists(),
+            "Expected Proton dir to exist in compat",
+        )
+
+        with patch("ulwgl_dl_util._extract_dir") as mock_function:
+            with self.assertRaisesRegex(KeyboardInterrupt, ""):
+                # Mock the interrupt
+                # We want the dir we tried to extract to be cleaned
+                mock_function.side_effect = KeyboardInterrupt
+                result = ulwgl_dl_util._get_from_cache(
+                    self.env, self.test_compat, self.test_cache, files, True
+                )
+
+                self.assertFalse(result, "Expected None on keyboard interrupt")
+                self.assertFalse(
+                    self.env["PROTONPATH"],
+                    "Expected PROTONPATH to be empty when the cache is empty",
+                )
+                self.assertFalse(
+                    self.test_compat.joinpath(
+                        self.test_archive.name[: self.test_archive.name.find(".tar.gz")]
+                    ).exists(),
+                    "Expected Proton dir in compat to be cleaned",
+                )
+
+    def test_cache_old(self):
+        """Test _get_from_cache when the cache is empty.
+
+        In real usage, this only happens as a last resort when: download fails, digests mismatched, etc.
+        """
+        result = None
+        # In the real usage, should be populated after successful callout for latest Proton releases
+        # Just mock it and assumes its the latest
+        files = [("", ""), (self.test_archive.name, "")]
+
+        # Mock old Proton versions in the cache
+        test_proton_dir = Path("ULWGL-Proton-foo")
+        test_proton_dir.mkdir(exist_ok=True)
+        test_archive = Path(self.test_cache).joinpath(
+            f"{test_proton_dir.as_posix()}.tar.gz"
+        )
+
+        with tarfile.open(test_archive.as_posix(), "w:gz") as tar:
+            tar.add(test_proton_dir.as_posix(), arcname=test_proton_dir.as_posix())
+
+        result = ulwgl_dl_util._get_from_cache(
+            self.env, self.test_compat, self.test_cache, files, False
+        )
+
+        # Verify that the old Proton was assigned
+        self.assertTrue(result is self.env, "Expected the same reference")
+        self.assertEqual(
+            self.env["PROTONPATH"],
+            self.test_compat.joinpath(
+                test_archive.name[: test_archive.name.find(".tar.gz")]
+            ).as_posix(),
+            "Expected PROTONPATH to be proton dir in compat",
+        )
+
+        test_archive.unlink()
+        test_proton_dir.rmdir()
+
+    def test_cache_empty(self):
+        """Test _get_from_cache when the cache is empty."""
+        result = None
+        # In the real usage, should be populated after successful callout for latest Proton releases
+        # Just mock it and assumes its the latest
+        files = [("", ""), (self.test_archive.name, "")]
+
+        self.test_archive.unlink()
+
+        result = ulwgl_dl_util._get_from_cache(
+            self.env, self.test_compat, self.test_cache, files, True
+        )
+        self.assertFalse(result, "Expected None when calling _get_from_cache")
+        self.assertFalse(
+            self.env["PROTONPATH"],
+            "Expected PROTONPATH to be empty when the cache is empty",
+        )
+
+    def test_cache(self):
+        """Test _get_from_cache.
+
+        Tests the case when the latest Proton already exists in the cache
+        """
+        result = None
+        # In the real usage, should be populated after successful callout for latest Proton releases
+        # Just mock it and assumes its the latest
+        files = [("", ""), (self.test_archive.name, "")]
+
+        result = ulwgl_dl_util._get_from_cache(
+            self.env, self.test_compat, self.test_cache, files, True
+        )
+        self.assertTrue(result is self.env, "Expected the same reference")
+        self.assertEqual(
+            self.env["PROTONPATH"],
+            self.test_compat.joinpath(
+                self.test_archive.name[: self.test_archive.name.find(".tar.gz")]
+            ).as_posix(),
+            "Expected PROTONPATH to be proton dir in compat",
+        )
 
     def test_steamcompat_nodir(self):
         """Test _get_from_steamcompat when a Proton doesn't exist in the Steam compat dir.