diff --git a/staticlibs/tests/unit/src/com/android/net/module/util/SharedLogTest.java b/staticlibs/tests/unit/src/com/android/net/module/util/SharedLogTest.java
index 446e881..aa1bfee 100644
--- a/staticlibs/tests/unit/src/com/android/net/module/util/SharedLogTest.java
+++ b/staticlibs/tests/unit/src/com/android/net/module/util/SharedLogTest.java
@@ -17,6 +17,8 @@
 package com.android.net.module.util;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertTrue;
 
 import androidx.test.filters.SmallTest;
@@ -27,16 +29,24 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.function.Consumer;
 
 @RunWith(AndroidJUnit4.class)
 @SmallTest
 public class SharedLogTest {
     private static final String TIMESTAMP_PATTERN = "\\d{2}:\\d{2}:\\d{2}";
     private static final String TIMESTAMP = "HH:MM:SS";
+    private static final String TAG = "top";
 
     @Test
     public void testBasicOperation() {
-        final SharedLog logTop = new SharedLog("top");
+        final SharedLog logTop = new SharedLog(TAG);
+        assertTrue(TAG.equals(logTop.getTag()));
+
         logTop.mark("first post!");
 
         final SharedLog logLevel2a = logTop.forSubComponent("twoA");
@@ -48,8 +58,10 @@
 
         final SharedLog logLevel3 = logLevel2a.forSubComponent("three");
         logTop.log("still logging");
-        logLevel3.log("3 >> 2");
+        logLevel2b.e(new Exception("Got another exception"));
+        logLevel3.i("3 >> 2");
         logLevel2a.mark("ok: last post");
+        logTop.logf("finished!");
 
         final String[] expected = {
             " - MARK first post!",
@@ -59,29 +71,53 @@
             " - [twoB] ERROR Wait, here's one: Test",
             " - [twoA] WARN second post?",
             " - still logging",
+            " - [twoB] ERROR java.lang.Exception: Got another exception",
             " - [twoA.three] 3 >> 2",
             " - [twoA] MARK ok: last post",
+            " - finished!",
         };
         // Verify the logs are all there and in the correct order.
-        verifyLogLines(expected, logTop);
+        assertDumpLogs(expected, logTop);
 
         // In fact, because they all share the same underlying LocalLog,
         // every subcomponent SharedLog's dump() is identical.
-        verifyLogLines(expected, logLevel2a);
-        verifyLogLines(expected, logLevel2b);
-        verifyLogLines(expected, logLevel3);
+        assertDumpLogs(expected, logLevel2a);
+        assertDumpLogs(expected, logLevel2b);
+        assertDumpLogs(expected, logLevel3);
     }
 
-    private static void verifyLogLines(String[] expected, SharedLog log) {
+    private static void assertDumpLogs(String[] expected, SharedLog log) {
+        verifyLogLines(expected, dump(log));
+        verifyLogLines(reverse(expected), reverseDump(log));
+    }
+
+    private static String dump(SharedLog log) {
+        return getSharedLogString(pw -> log.dump(null /* fd */, pw, null /* args */));
+    }
+
+    private static String reverseDump(SharedLog log) {
+        return getSharedLogString(pw -> log.reverseDump(pw));
+    }
+
+    private static String[] reverse(String[] ary) {
+        final List<String> ls = new ArrayList<>(Arrays.asList(ary));
+        Collections.reverse(ls);
+        return ls.toArray(new String[ary.length]);
+    }
+
+    private static String getSharedLogString(Consumer<PrintWriter> functor) {
         final ByteArrayOutputStream ostream = new ByteArrayOutputStream();
         final PrintWriter pw = new PrintWriter(ostream, true);
-        log.dump(null, pw, null);
+        functor.accept(pw);
 
         final String dumpOutput = ostream.toString();
-        assertTrue(dumpOutput != null);
-        assertTrue(!"".equals(dumpOutput));
+        assertNotNull(dumpOutput);
+        assertFalse("".equals(dumpOutput));
+        return dumpOutput;
+    }
 
-        final String[] lines = dumpOutput.split("\n");
+    private static void verifyLogLines(String[] expected, String gottenLogs) {
+        final String[] lines = gottenLogs.split("\n");
         assertEquals(expected.length, lines.length);
 
         for (int i = 0; i < expected.length; i++) {