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diff --git a/javatests/com/google/gerrit/common/data/ParameterizedStringTest.java b/javatests/com/google/gerrit/common/data/ParameterizedStringTest.java
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+++ b/javatests/com/google/gerrit/common/data/ParameterizedStringTest.java
@@ -0,0 +1,398 @@
+// 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 "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.gerrit.common.data;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.common.collect.ImmutableMap;
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.Test;
+
+public class ParameterizedStringTest {
+  @Test
+  public void emptyString() {
+    ParameterizedString p = new ParameterizedString("");
+    assertThat(p.getPattern()).isEmpty();
+    assertThat(p.getRawPattern()).isEmpty();
+    assertThat(p.getParameterNames()).isEmpty();
+
+    Map<String, String> a = new HashMap<>();
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).isEmpty();
+    assertThat(p.replace(a)).isEmpty();
+  }
+
+  @Test
+  public void asis1() {
+    ParameterizedString p = ParameterizedString.asis("${bar}c");
+    assertThat(p.getPattern()).isEqualTo("${bar}c");
+    assertThat(p.getRawPattern()).isEqualTo("${bar}c");
+    assertThat(p.getParameterNames()).isEmpty();
+
+    Map<String, String> a = new HashMap<>();
+    a.put("bar", "frobinator");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).isEmpty();
+    assertThat(p.replace(a)).isEqualTo("${bar}c");
+  }
+
+  @Test
+  public void replace1() {
+    ParameterizedString p = new ParameterizedString("${bar}c");
+    assertThat(p.getPattern()).isEqualTo("${bar}c");
+    assertThat(p.getRawPattern()).isEqualTo("{0}c");
+    assertThat(p.getParameterNames()).containsExactly("bar");
+
+    Map<String, String> a = new HashMap<>();
+    a.put("bar", "frobinator");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("frobinator");
+    assertThat(p.replace(a)).isEqualTo("frobinatorc");
+  }
+
+  @Test
+  public void replace2() {
+    ParameterizedString p = new ParameterizedString("a${bar}c");
+    assertThat(p.getPattern()).isEqualTo("a${bar}c");
+    assertThat(p.getRawPattern()).isEqualTo("a{0}c");
+    assertThat(p.getParameterNames()).containsExactly("bar");
+
+    Map<String, String> a = new HashMap<>();
+    a.put("bar", "frobinator");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("frobinator");
+    assertThat(p.replace(a)).isEqualTo("afrobinatorc");
+  }
+
+  @Test
+  public void replace3() {
+    ParameterizedString p = new ParameterizedString("a${bar}");
+    assertThat(p.getPattern()).isEqualTo("a${bar}");
+    assertThat(p.getRawPattern()).isEqualTo("a{0}");
+    assertThat(p.getParameterNames()).containsExactly("bar");
+
+    Map<String, String> a = new HashMap<>();
+    a.put("bar", "frobinator");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("frobinator");
+    assertThat(p.replace(a)).isEqualTo("afrobinator");
+  }
+
+  @Test
+  public void replace4() {
+    ParameterizedString p = new ParameterizedString("a${bar}c");
+    assertThat(p.getPattern()).isEqualTo("a${bar}c");
+    assertThat(p.getRawPattern()).isEqualTo("a{0}c");
+    assertThat(p.getParameterNames()).containsExactly("bar");
+
+    Map<String, String> a = new HashMap<>();
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEmpty();
+    assertThat(p.replace(a)).isEqualTo("ac");
+  }
+
+  @Test
+  public void replaceToLowerCase() {
+    ParameterizedString p = new ParameterizedString("${a.toLowerCase}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "foo");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+
+    a.put("a", "FOO");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+  }
+
+  @Test
+  public void replaceToUpperCase() {
+    ParameterizedString p = new ParameterizedString("${a.toUpperCase}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "foo");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO");
+    assertThat(p.replace(a)).isEqualTo("FOO");
+
+    a.put("a", "FOO");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO");
+    assertThat(p.replace(a)).isEqualTo("FOO");
+  }
+
+  @Test
+  public void replaceLocalName() {
+    ParameterizedString p = new ParameterizedString("${a.localPart}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+
+    a.put("a", "foo");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+  }
+
+  @Test
+  public void undefinedFunctionName() {
+    ParameterizedString p =
+        new ParameterizedString(
+            "hi, ${userName.toUpperCase},your eamil address is '${email.toLowerCase.localPart}'.right?");
+    assertThat(p.getParameterNames()).containsExactly("userName", "email");
+
+    Map<String, String> a = new HashMap<>();
+    a.put("userName", "firstName lastName");
+    a.put("email", "FIRSTNAME.LASTNAME@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(2);
+
+    assertThat(p.bind(a)[0]).isEqualTo("FIRSTNAME LASTNAME");
+    assertThat(p.bind(a)[1]).isEqualTo("firstname.lastname");
+    assertThat(p.replace(a))
+        .isEqualTo("hi, FIRSTNAME LASTNAME,your eamil address is 'firstname.lastname'.right?");
+  }
+
+  @Test
+  public void replaceToUpperCaseToLowerCase() {
+    ParameterizedString p = new ParameterizedString("${a.toUpperCase.toLowerCase}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo@example.com");
+    assertThat(p.replace(a)).isEqualTo("foo@example.com");
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo@example.com");
+    assertThat(p.replace(a)).isEqualTo("foo@example.com");
+  }
+
+  @Test
+  public void replaceToUpperCaseLocalName() {
+    ParameterizedString p = new ParameterizedString("${a.toUpperCase.localPart}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO");
+    assertThat(p.replace(a)).isEqualTo("FOO");
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO");
+    assertThat(p.replace(a)).isEqualTo("FOO");
+  }
+
+  @Test
+  public void replaceToUpperCaseAnUndefinedMethod() {
+    ParameterizedString p = new ParameterizedString("${a.toUpperCase.anUndefinedMethod}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO@EXAMPLE.COM");
+    assertThat(p.replace(a)).isEqualTo("FOO@EXAMPLE.COM");
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO@EXAMPLE.COM");
+    assertThat(p.replace(a)).isEqualTo("FOO@EXAMPLE.COM");
+  }
+
+  @Test
+  public void replaceLocalNameToUpperCase() {
+    ParameterizedString p = new ParameterizedString("${a.localPart.toUpperCase}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO");
+    assertThat(p.replace(a)).isEqualTo("FOO");
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO");
+    assertThat(p.replace(a)).isEqualTo("FOO");
+  }
+
+  @Test
+  public void replaceLocalNameToLowerCase() {
+    ParameterizedString p = new ParameterizedString("${a.localPart.toLowerCase}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+  }
+
+  @Test
+  public void replaceLocalNameAnUndefinedMethod() {
+    ParameterizedString p = new ParameterizedString("${a.localPart.anUndefinedMethod}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO");
+    assertThat(p.replace(a)).isEqualTo("FOO");
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+  }
+
+  @Test
+  public void replaceToLowerCaseToUpperCase() {
+    ParameterizedString p = new ParameterizedString("${a.toLowerCase.toUpperCase}");
+    assertThat(p.getParameterNames()).hasSize(1);
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO@EXAMPLE.COM");
+    assertThat(p.replace(a)).isEqualTo("FOO@EXAMPLE.COM");
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("FOO@EXAMPLE.COM");
+    assertThat(p.replace(a)).isEqualTo("FOO@EXAMPLE.COM");
+  }
+
+  @Test
+  public void replaceToLowerCaseLocalName() {
+    ParameterizedString p = new ParameterizedString("${a.toLowerCase.localPart}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo");
+    assertThat(p.replace(a)).isEqualTo("foo");
+  }
+
+  @Test
+  public void replaceToLowerCaseAnUndefinedMethod() {
+    ParameterizedString p = new ParameterizedString("${a.toLowerCase.anUndefinedMethod}");
+    assertThat(p.getParameterNames()).containsExactly("a");
+
+    Map<String, String> a = new HashMap<>();
+
+    a.put("a", "foo@example.com");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo@example.com");
+    assertThat(p.replace(a)).isEqualTo("foo@example.com");
+
+    a.put("a", "FOO@EXAMPLE.COM");
+    assertThat(p.bind(a)).isNotNull();
+    assertThat(p.bind(a)).hasLength(1);
+    assertThat(p.bind(a)[0]).isEqualTo("foo@example.com");
+    assertThat(p.replace(a)).isEqualTo("foo@example.com");
+  }
+
+  @Test
+  public void replaceSubmitTooltipWithVariables() {
+    ParameterizedString p = new ParameterizedString("Submit patch set ${patchSet} into ${branch}");
+    assertThat(p.getParameterNames()).hasSize(2);
+    assertThat(p.getParameterNames()).containsExactly("patchSet", "branch");
+
+    Map<String, String> params =
+        ImmutableMap.of(
+            "patchSet", "42",
+            "branch", "foo");
+    assertThat(p.bind(params)).isNotNull();
+    assertThat(p.bind(params)).hasLength(2);
+    assertThat(p.bind(params)[0]).isEqualTo("42");
+    assertThat(p.bind(params)[1]).isEqualTo("foo");
+    assertThat(p.replace(params)).isEqualTo("Submit patch set 42 into foo");
+  }
+
+  @Test
+  public void replaceSubmitTooltipWithoutVariables() {
+    ParameterizedString p = new ParameterizedString("Submit patch set 40 into master");
+    Map<String, String> params =
+        ImmutableMap.of(
+            "patchSet", "42",
+            "branch", "foo");
+    assertThat(p.bind(params)).isEmpty();
+    assertThat(p.replace(params)).isEqualTo("Submit patch set 40 into master");
+  }
+}