DiffCommandTest: Don't call toString on String instances

Change-Id: Ib308b3498593d595b3d8741a9b2d241bbc7441c3
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/DiffCommandTest.java

@@ -95,7 +95,7 @@ public class DiffCommandTest extends RepositoryTestCase {
 					+ "\\ No newline at end of file\n"
 					+ "+folder change\n"
 					+ "\\ No newline at end of file\n";
-			assertEquals(expected.toString(), actual);
+			assertEquals(expected, actual);
 		}
 	}
 
@@ -130,7 +130,7 @@ public class DiffCommandTest extends RepositoryTestCase {
 					+ "@@ -0,0 +1 @@\n"
 					+ "+folder\n"
 					+ "\\ No newline at end of file\n";
-			assertEquals(expected.toString(), actual);
+			assertEquals(expected, actual);
 		}
 	}
 
@@ -179,7 +179,7 @@ public class DiffCommandTest extends RepositoryTestCase {
 					+ "\\ No newline at end of file\n"
 					+ "+folder change\n"
 					+ "\\ No newline at end of file\n";
-			assertEquals(expected.toString(), actual);
+			assertEquals(expected, actual);
 		}
 	}
 
@@ -201,7 +201,7 @@ public class DiffCommandTest extends RepositoryTestCase {
 					+ "+++ new/test.txt\n" + "@@ -1 +1 @@\n" + "-test\n"
 					+ "\\ No newline at end of file\n" + "+test change\n"
 					+ "\\ No newline at end of file\n";
-			assertEquals(expected.toString(), actual);
+			assertEquals(expected, actual);
 		}
 	}
 
@@ -223,7 +223,7 @@ public class DiffCommandTest extends RepositoryTestCase {
 					+ "index f55b5c9..c5ec8fd 100644\n" + "--- a/test.txt\n"
 					+ "+++ b/test.txt\n" + "@@ -4,3 +4,3 @@\n" + " 3\n" + "-4\n"
 					+ "+4a\n" + " 5\n";
-			assertEquals(expected.toString(), actual);
+			assertEquals(expected, actual);
 		}
 	}