Merge pull request #165 from OpenHFT/codex/add-test-for-affinity.setthreadid()

Add SetThreadId reflection test

Author: peter-lawrey-admin

affinity/src/test/java/net/openhft/affinity/SetThreadIdTest.java

@@ -0,0 +1,25 @@
+package net.openhft.affinity;
+
+import org.junit.Assume;
+import org.junit.Test;
+
+import java.lang.reflect.Field;
+
+import static org.junit.Assert.assertEquals;
+
+public class SetThreadIdTest {
+
+    @Test
+    public void setThreadIdShouldUpdateThreadTidField() throws Exception {
+        Field tidFieldField = Affinity.class.getDeclaredField("THREAD_TID_FIELD");
+        tidFieldField.setAccessible(true);
+        Field tidField = (Field) tidFieldField.get(null);
+        Assume.assumeTrue(tidField != null);
+        tidField.setAccessible(true);
+
+        Affinity.setThreadId();
+        long expected = Affinity.getThreadId();
+        long actual = tidField.getLong(Thread.currentThread());
+        assertEquals(expected, actual);
+    }
+}