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diff --git a/javatests/com/google/gerrit/common/data/PermissionTest.java b/javatests/com/google/gerrit/common/data/PermissionTest.java
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+++ b/javatests/com/google/gerrit/common/data/PermissionTest.java
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+// Copyright (C) 2018 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.ImmutableList;
+import com.google.gerrit.reviewdb.client.AccountGroup;
+import java.util.ArrayList;
+import java.util.List;
+import org.junit.Before;
+import org.junit.Test;
+
+public class PermissionTest {
+  private static final String PERMISSION_NAME = "foo";
+
+  private Permission permission;
+
+  @Before
+  public void setup() {
+    this.permission = new Permission(PERMISSION_NAME);
+  }
+
+  @Test
+  public void isPermission() {
+    assertThat(Permission.isPermission(Permission.ABANDON)).isTrue();
+    assertThat(Permission.isPermission("no-permission")).isFalse();
+
+    assertThat(Permission.isPermission(Permission.LABEL + "Code-Review")).isTrue();
+    assertThat(Permission.isPermission(Permission.LABEL_AS + "Code-Review")).isTrue();
+    assertThat(Permission.isPermission("Code-Review")).isFalse();
+  }
+
+  @Test
+  public void hasRange() {
+    assertThat(Permission.hasRange(Permission.ABANDON)).isFalse();
+    assertThat(Permission.hasRange("no-permission")).isFalse();
+
+    assertThat(Permission.hasRange(Permission.LABEL + "Code-Review")).isTrue();
+    assertThat(Permission.hasRange(Permission.LABEL_AS + "Code-Review")).isTrue();
+    assertThat(Permission.hasRange("Code-Review")).isFalse();
+  }
+
+  @Test
+  public void isLabel() {
+    assertThat(Permission.isLabel(Permission.ABANDON)).isFalse();
+    assertThat(Permission.isLabel("no-permission")).isFalse();
+
+    assertThat(Permission.isLabel(Permission.LABEL + "Code-Review")).isTrue();
+    assertThat(Permission.isLabel(Permission.LABEL_AS + "Code-Review")).isFalse();
+    assertThat(Permission.isLabel("Code-Review")).isFalse();
+  }
+
+  @Test
+  public void isLabelAs() {
+    assertThat(Permission.isLabelAs(Permission.ABANDON)).isFalse();
+    assertThat(Permission.isLabelAs("no-permission")).isFalse();
+
+    assertThat(Permission.isLabelAs(Permission.LABEL + "Code-Review")).isFalse();
+    assertThat(Permission.isLabelAs(Permission.LABEL_AS + "Code-Review")).isTrue();
+    assertThat(Permission.isLabelAs("Code-Review")).isFalse();
+  }
+
+  @Test
+  public void forLabel() {
+    assertThat(Permission.forLabel("Code-Review")).isEqualTo(Permission.LABEL + "Code-Review");
+  }
+
+  @Test
+  public void forLabelAs() {
+    assertThat(Permission.forLabelAs("Code-Review")).isEqualTo(Permission.LABEL_AS + "Code-Review");
+  }
+
+  @Test
+  public void extractLabel() {
+    assertThat(Permission.extractLabel(Permission.LABEL + "Code-Review")).isEqualTo("Code-Review");
+    assertThat(Permission.extractLabel(Permission.LABEL_AS + "Code-Review"))
+        .isEqualTo("Code-Review");
+    assertThat(Permission.extractLabel("Code-Review")).isNull();
+    assertThat(Permission.extractLabel(Permission.ABANDON)).isNull();
+  }
+
+  @Test
+  public void canBeOnAllProjects() {
+    assertThat(Permission.canBeOnAllProjects(AccessSection.ALL, Permission.ABANDON)).isTrue();
+    assertThat(Permission.canBeOnAllProjects(AccessSection.ALL, Permission.OWNER)).isFalse();
+    assertThat(Permission.canBeOnAllProjects(AccessSection.ALL, Permission.LABEL + "Code-Review"))
+        .isTrue();
+    assertThat(
+            Permission.canBeOnAllProjects(AccessSection.ALL, Permission.LABEL_AS + "Code-Review"))
+        .isTrue();
+
+    assertThat(Permission.canBeOnAllProjects("refs/heads/*", Permission.ABANDON)).isTrue();
+    assertThat(Permission.canBeOnAllProjects("refs/heads/*", Permission.OWNER)).isTrue();
+    assertThat(Permission.canBeOnAllProjects("refs/heads/*", Permission.LABEL + "Code-Review"))
+        .isTrue();
+    assertThat(Permission.canBeOnAllProjects("refs/heads/*", Permission.LABEL_AS + "Code-Review"))
+        .isTrue();
+  }
+
+  @Test
+  public void getName() {
+    assertThat(permission.getName()).isEqualTo(PERMISSION_NAME);
+  }
+
+  @Test
+  public void getLabel() {
+    assertThat(new Permission(Permission.LABEL + "Code-Review").getLabel())
+        .isEqualTo("Code-Review");
+    assertThat(new Permission(Permission.LABEL_AS + "Code-Review").getLabel())
+        .isEqualTo("Code-Review");
+    assertThat(new Permission("Code-Review").getLabel()).isNull();
+    assertThat(new Permission(Permission.ABANDON).getLabel()).isNull();
+  }
+
+  @Test
+  public void exclusiveGroup() {
+    assertThat(permission.getExclusiveGroup()).isFalse();
+
+    permission.setExclusiveGroup(true);
+    assertThat(permission.getExclusiveGroup()).isTrue();
+
+    permission.setExclusiveGroup(false);
+    assertThat(permission.getExclusiveGroup()).isFalse();
+  }
+
+  @Test
+  public void noExclusiveGroupOnOwnerPermission() {
+    Permission permission = new Permission(Permission.OWNER);
+    assertThat(permission.getExclusiveGroup()).isFalse();
+
+    permission.setExclusiveGroup(true);
+    assertThat(permission.getExclusiveGroup()).isFalse();
+  }
+
+  @Test
+  public void getEmptyRules() {
+    assertThat(permission.getRules()).isNotNull();
+    assertThat(permission.getRules()).isEmpty();
+  }
+
+  @Test
+  public void setAndGetRules() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+    permission.setRules(ImmutableList.of(permissionRule1, permissionRule2));
+    assertThat(permission.getRules()).containsExactly(permissionRule1, permissionRule2).inOrder();
+
+    PermissionRule permissionRule3 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-3"), "group3"));
+    permission.setRules(ImmutableList.of(permissionRule3));
+    assertThat(permission.getRules()).containsExactly(permissionRule3);
+  }
+
+  @Test
+  public void cannotAddPermissionByModifyingListThatWasProvidedToAccessSection() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+    GroupReference groupReference3 = new GroupReference(new AccountGroup.UUID("uuid-3"), "group3");
+
+    List<PermissionRule> rules = new ArrayList<>();
+    rules.add(permissionRule1);
+    rules.add(permissionRule2);
+    permission.setRules(rules);
+    assertThat(permission.getRule(groupReference3)).isNull();
+
+    PermissionRule permissionRule3 = new PermissionRule(groupReference3);
+    rules.add(permissionRule3);
+    assertThat(permission.getRule(groupReference3)).isNull();
+  }
+
+  @Test
+  public void cannotAddPermissionByModifyingListThatWasRetrievedFromAccessSection() {
+    GroupReference groupReference1 = new GroupReference(new AccountGroup.UUID("uuid-1"), "group1");
+    PermissionRule permissionRule1 = new PermissionRule(groupReference1);
+    permission.getRules().add(permissionRule1);
+    assertThat(permission.getRule(groupReference1)).isNull();
+
+    List<PermissionRule> rules = new ArrayList<>();
+    rules.add(new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2")));
+    rules.add(new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-3"), "group3")));
+    permission.setRules(rules);
+    assertThat(permission.getRule(groupReference1)).isNull();
+    permission.getRules().add(permissionRule1);
+    assertThat(permission.getRule(groupReference1)).isNull();
+  }
+
+  @Test
+  public void getNonExistingRule() {
+    GroupReference groupReference = new GroupReference(new AccountGroup.UUID("uuid-1"), "group1");
+    assertThat(permission.getRule(groupReference)).isNull();
+    assertThat(permission.getRule(groupReference, false)).isNull();
+  }
+
+  @Test
+  public void getRule() {
+    GroupReference groupReference = new GroupReference(new AccountGroup.UUID("uuid-1"), "group1");
+    PermissionRule permissionRule = new PermissionRule(groupReference);
+    permission.setRules(ImmutableList.of(permissionRule));
+    assertThat(permission.getRule(groupReference)).isEqualTo(permissionRule);
+  }
+
+  @Test
+  public void createMissingRuleOnGet() {
+    GroupReference groupReference = new GroupReference(new AccountGroup.UUID("uuid-1"), "group1");
+    assertThat(permission.getRule(groupReference)).isNull();
+
+    assertThat(permission.getRule(groupReference, true))
+        .isEqualTo(new PermissionRule(groupReference));
+  }
+
+  @Test
+  public void addRule() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+    permission.setRules(ImmutableList.of(permissionRule1, permissionRule2));
+    GroupReference groupReference3 = new GroupReference(new AccountGroup.UUID("uuid-3"), "group3");
+    assertThat(permission.getRule(groupReference3)).isNull();
+
+    PermissionRule permissionRule3 = new PermissionRule(groupReference3);
+    permission.add(permissionRule3);
+    assertThat(permission.getRule(groupReference3)).isEqualTo(permissionRule3);
+    assertThat(permission.getRules())
+        .containsExactly(permissionRule1, permissionRule2, permissionRule3)
+        .inOrder();
+  }
+
+  @Test
+  public void removeRule() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+    GroupReference groupReference3 = new GroupReference(new AccountGroup.UUID("uuid-3"), "group3");
+    PermissionRule permissionRule3 = new PermissionRule(groupReference3);
+
+    permission.setRules(ImmutableList.of(permissionRule1, permissionRule2, permissionRule3));
+    assertThat(permission.getRule(groupReference3)).isNotNull();
+
+    permission.remove(permissionRule3);
+    assertThat(permission.getRule(groupReference3)).isNull();
+    assertThat(permission.getRules()).containsExactly(permissionRule1, permissionRule2).inOrder();
+  }
+
+  @Test
+  public void removeRuleByGroupReference() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+    GroupReference groupReference3 = new GroupReference(new AccountGroup.UUID("uuid-3"), "group3");
+    PermissionRule permissionRule3 = new PermissionRule(groupReference3);
+
+    permission.setRules(ImmutableList.of(permissionRule1, permissionRule2, permissionRule3));
+    assertThat(permission.getRule(groupReference3)).isNotNull();
+
+    permission.removeRule(groupReference3);
+    assertThat(permission.getRule(groupReference3)).isNull();
+    assertThat(permission.getRules()).containsExactly(permissionRule1, permissionRule2).inOrder();
+  }
+
+  @Test
+  public void clearRules() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+
+    permission.setRules(ImmutableList.of(permissionRule1, permissionRule2));
+    assertThat(permission.getRules()).isNotEmpty();
+
+    permission.clearRules();
+    assertThat(permission.getRules()).isEmpty();
+  }
+
+  @Test
+  public void mergePermissions() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+    PermissionRule permissionRule3 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-3"), "group3"));
+
+    Permission permission1 = new Permission("foo");
+    permission1.setRules(ImmutableList.of(permissionRule1, permissionRule2));
+
+    Permission permission2 = new Permission("bar");
+    permission2.setRules(ImmutableList.of(permissionRule2, permissionRule3));
+
+    permission1.mergeFrom(permission2);
+    assertThat(permission1.getRules())
+        .containsExactly(permissionRule1, permissionRule2, permissionRule3)
+        .inOrder();
+  }
+
+  @Test
+  public void testEquals() {
+    PermissionRule permissionRule1 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-1"), "group1"));
+    PermissionRule permissionRule2 =
+        new PermissionRule(new GroupReference(new AccountGroup.UUID("uuid-2"), "group2"));
+
+    permission.setRules(ImmutableList.of(permissionRule1, permissionRule2));
+
+    Permission permissionSameRulesOtherName = new Permission("bar");
+    permissionSameRulesOtherName.setRules(ImmutableList.of(permissionRule1, permissionRule2));
+    assertThat(permission.equals(permissionSameRulesOtherName)).isFalse();
+
+    Permission permissionSameRulesSameNameOtherExclusiveGroup = new Permission("foo");
+    permissionSameRulesSameNameOtherExclusiveGroup.setRules(
+        ImmutableList.of(permissionRule1, permissionRule2));
+    permissionSameRulesSameNameOtherExclusiveGroup.setExclusiveGroup(true);
+    assertThat(permission.equals(permissionSameRulesSameNameOtherExclusiveGroup)).isFalse();
+
+    Permission permissionOther = new Permission(PERMISSION_NAME);
+    permissionOther.setRules(ImmutableList.of(permissionRule1));
+    assertThat(permission.equals(permissionOther)).isFalse();
+
+    permissionOther.add(permissionRule2);
+    assertThat(permission.equals(permissionOther)).isTrue();
+  }
+}