python/tests: clean up generated files if successful

python/tests/compatibility_test.py

@@ -24,4 +24,7 @@ for filename in glob.glob("testdata/*.compressed*"):
                    env=TEST_ENV)
     if diff_q(uncompressed, expected) != 0:
         sys.exit(1)
-    os.unlink(uncompressed)
+    try:
+        os.unlink(uncompressed)
+    except OSError:
+        pass

python/tests/custom_dictionary_test.py

@@ -34,3 +34,8 @@ for filename in INPUTS.splitlines():
                         uncompressed, "--custom-dictionary", filename], env=TEST_ENV)
             if diff_q(filename, uncompressed) != 0:
                 sys.exit(1)
+            try:
+                os.unlink(compressed)
+                os.unlink(uncompressed)
+            except OSError:
+                pass

python/tests/roundtrip_test.py

@@ -41,3 +41,8 @@ for filename in INPUTS.splitlines():
                        env=TEST_ENV)
         if diff_q(filename, uncompressed) != 0:
             sys.exit(1)
+        try:
+            os.unlink(compressed)
+            os.unlink(uncompressed)
+        except OSError:
+            pass