[Retrace] Adjust testHelp test expectation

Change-Id: I94734667d068287aa9549c24a425654e08ce24fc
diff --git a/src/test/java/com/android/tools/r8/retrace/RetraceCommandLineTests.java b/src/test/java/com/android/tools/r8/retrace/RetraceCommandLineTests.java
index 16f4620..85e6cbc 100644
--- a/src/test/java/com/android/tools/r8/retrace/RetraceCommandLineTests.java
+++ b/src/test/java/com/android/tools/r8/retrace/RetraceCommandLineTests.java
@@ -150,7 +150,7 @@
   public void testHelp() throws IOException {
     ProcessResult processResult = runRetraceCommandLine(null, Arrays.asList("--help"));
     assertEquals(0, processResult.exitCode);
-    assertEquals(Retrace.USAGE_MESSAGE, processResult.stdout);
+    assertThat(processResult.stdout, containsString(Retrace.USAGE_MESSAGE));
   }
 
   @Test