Bug 571239 - [Tests] 21 test failures in I20210216-1340 on windows

- Compiler user / as file separator. but the test is using
File.separator for / this causes windows to use \. which is incorrect.

Change-Id: I4ce8590eb838681bb266808297339d80053ec225
Signed-off-by: Sravan Kumar Lakkimsetti <sravankumarl@in.ibm.com>
diff --git a/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NullAnnotationBatchCompilerTest.java b/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NullAnnotationBatchCompilerTest.java
index 5ee587e..ff78e89 100644
--- a/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NullAnnotationBatchCompilerTest.java
+++ b/org.eclipse.jdt.core.tests.compiler/src/org/eclipse/jdt/core/tests/compiler/regression/NullAnnotationBatchCompilerTest.java
@@ -1103,12 +1103,12 @@
 		// expect eea-motivated problems in Test1 but no in FooImpl:
 		String expectedCompilerMessage =
 				"----------\n" +
-				"1. ERROR in ---OUTPUT_DIR_PLACEHOLDER---" + File.separator + "test1" + File.separator + "Test1.java (at line 7)\n" +
+				"1. ERROR in ---OUTPUT_DIR_PLACEHOLDER---/test1/Test1.java (at line 7)\n" +
 				"	String result = api.m(null);\n" +
 				"	                      ^^^^\n" +
 				"Null type mismatch: required '@NonNull String' but the provided value is null\n" +
 				"----------\n" +
-				"2. WARNING in ---OUTPUT_DIR_PLACEHOLDER---" + File.separator + "test1" + File.separator + "Test1.java (at line 8)\n" +
+				"2. WARNING in ---OUTPUT_DIR_PLACEHOLDER---/test1/Test1.java (at line 8)\n" +
 				"	System.out.println(result.toUpperCase());\n" +
 				"	                   ^^^^^^\n" +
 				"Potential null pointer access: The variable result may be null at this location\n" +