Add some source cache tests.

test/test_cache_source.py

@@ -0,0 +1,44 @@
+import pytest
+
+import large_image
+from large_image.cache_util import cachesClear
+
+from .datastore import datastore
+
+
+@pytest.mark.singular
+def testCacheSourceStyle():
+    cachesClear()
+    imagePath = datastore.fetch('sample_image.ptif')
+    ts1 = large_image.open(imagePath)
+    ts2 = large_image.open(imagePath, style={'max': 128})
+    ts3 = large_image.open(imagePath, style={'max': 160})
+    tile1 = ts1.getTile(0, 0, 4)
+    assert ts1.getTile(0, 0, 4) is not None
+    assert ts2.getTile(0, 0, 4) is not None
+    assert ts3.getTile(0, 0, 4) is not None
+    cachesClear()
+    assert ts1.getTile(0, 0, 4) == tile1
+    del ts1
+    assert ts2.getTile(1, 0, 4) is not None
+    cachesClear()
+    assert ts2.getTile(2, 0, 4) is not None
+    ts1 = large_image.open(imagePath)
+    assert ts1.getTile(0, 0, 4) == tile1
+
+
+@pytest.mark.singular
+def testCacheSourceStyleFirst():
+    cachesClear()
+    imagePath = datastore.fetch('sample_image.ptif')
+    ts2 = large_image.open(imagePath, style={'max': 128})
+    ts1 = large_image.open(imagePath)
+    tile1 = ts1.getTile(0, 0, 4)
+    assert ts1.getTile(0, 0, 4) is not None
+    assert ts2.getTile(0, 0, 4) is not None
+    del ts1
+    assert ts2.getTile(1, 0, 4) is not None
+    cachesClear()
+    assert ts2.getTile(2, 0, 4) is not None
+    ts1 = large_image.open(imagePath)
+    assert ts1.getTile(0, 0, 4) == tile1