Fix test assertion on Windows

Author: henryju

org.eclipse.lsp4j.jsonrpc/src/test/java/org/eclipse/lsp4j/jsonrpc/test/TracingMessageConsumerTest.java

@@ -11,6 +11,7 @@
  ******************************************************************************/
 package org.eclipse.lsp4j.jsonrpc.test;
 
+import java.io.File;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import org.eclipse.lsp4j.jsonrpc.*;
@@ -157,7 +158,7 @@ public void testReceivedErrorResponseWithCustomDataAdapter() {
 			"Error: {\n" +
 			"  \"code\": -32600,\n" +
 			"  \"message\": \"bar\",\n" +
-			"  \"data\": \"foo/Bar.java\"\n" +
+			"  \"data\": \"foo" + File.separator + "Bar.java\"\n" +
 			"}\n" +
 			"\n" +
 			"\n";
@@ -287,7 +288,7 @@ public void testSendingNotificationWithCustomAdapter() {
 		String actualTrace = stringWriter.toString();
 		String expectedTrace = "" +
 			"[Trace - 06:07:30 PM] Sending notification 'foo'\n" +
-			"Params: \"foo/Bar.java\"\n" +
+			"Params: \"foo" + File.separator + "Bar.java\"\n" +
 			"\n" +
 			"\n";