Fix test on Windows

Change-Id: Ia9d21998a66665b3e5e108a8a0d6eeacf89b3b42
diff --git a/src/test/java/com/android/tools/r8/shaking/ProguardConfigurationParserTest.java b/src/test/java/com/android/tools/r8/shaking/ProguardConfigurationParserTest.java
index 83ae311..f26e48d 100644
--- a/src/test/java/com/android/tools/r8/shaking/ProguardConfigurationParserTest.java
+++ b/src/test/java/com/android/tools/r8/shaking/ProguardConfigurationParserTest.java
@@ -966,7 +966,7 @@
     verifyParserEndsCleanly();
     ProguardConfiguration config = parser.getConfig();
     assertTrue(config.isPrintConfiguration());
-    assertEquals("./file_name", config.getPrintConfigurationFile().toString());
+    assertEquals("." + File.separator + "file_name", config.getPrintConfigurationFile().toString());
   }
 
   @Test