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diff --git a/javatests/com/google/gwtexpui/safehtml/client/SafeHtml_WikifyPreformatTest.java b/javatests/com/google/gwtexpui/safehtml/client/SafeHtml_WikifyPreformatTest.java
new file mode 100644
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+++ b/javatests/com/google/gwtexpui/safehtml/client/SafeHtml_WikifyPreformatTest.java
@@ -0,0 +1,81 @@
+// Copyright (C) 2009 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "<p>AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gwtexpui.safehtml.client;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Test;
+
+public class SafeHtml_WikifyPreformatTest {
+  private static final String B = "<span class=\"wikiPreFormat\">";
+  private static final String E = "</span><br />";
+
+  private static String pre(String raw) {
+    return B + raw + E;
+  }
+
+  @Test
+  public void preformat1() {
+    final SafeHtml o = html("A\n\n  This is pre\n  formatted");
+    final SafeHtml n = o.wikify();
+    assertThat(o).isNotSameAs(n);
+    assertThat(n.asString())
+        .isEqualTo("<p>A</p><p>" + pre("  This is pre") + pre("  formatted") + "</p>");
+  }
+
+  @Test
+  public void preformat2() {
+    final SafeHtml o = html("A\n\n  This is pre\n  formatted\n\nbut this is not");
+    final SafeHtml n = o.wikify();
+    assertThat(o).isNotSameAs(n);
+    assertThat(n.asString())
+        .isEqualTo(
+            "<p>A</p>"
+                + "<p>"
+                + pre("  This is pre")
+                + pre("  formatted")
+                + "</p>"
+                + "<p>but this is not</p>");
+  }
+
+  @Test
+  public void preformat3() {
+    final SafeHtml o = html("A\n\n  Q\n    <R>\n  S\n\nB");
+    final SafeHtml n = o.wikify();
+    assertThat(o).isNotSameAs(n);
+    assertThat(n.asString())
+        .isEqualTo(
+            "<p>A</p>"
+                + "<p>"
+                + pre("  Q")
+                + pre("    &lt;R&gt;")
+                + pre("  S")
+                + "</p>"
+                + "<p>B</p>");
+  }
+
+  @Test
+  public void preformat4() {
+    final SafeHtml o = html("  Q\n    <R>\n  S\n\nB");
+    final SafeHtml n = o.wikify();
+    assertThat(o).isNotSameAs(n);
+    assertThat(n.asString())
+        .isEqualTo("<p>" + pre("  Q") + pre("    &lt;R&gt;") + pre("  S") + "</p><p>B</p>");
+  }
+
+  private static SafeHtml html(String text) {
+    return new SafeHtmlBuilder().append(text).toSafeHtml();
+  }
+}