Improve test coverage for PredicateCache

Add a unit test to improve coverage for `isCacheableByBranch`.

Change-Id: I316f2861a5993bd7b922f1b7185f1d061bcf8b87

src/test/java/com/googlesource/gerrit/plugins/task/PredicateCacheTest.java

diff --git a/src/test/java/com/googlesource/gerrit/plugins/task/PredicateCacheTest.java b/src/test/java/com/googlesource/gerrit/plugins/task/PredicateCacheTest.java
new file mode 100644
index 0000000..e5bf953
--- /dev/null
+++ b/src/test/java/com/googlesource/gerrit/plugins/task/PredicateCacheTest.java
@@ -0,0 +1,69 @@
+// Copyright (C) 2024 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.googlesource.gerrit.plugins.task;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import com.google.gerrit.acceptance.LightweightPluginDaemonTest;
+import com.google.gerrit.acceptance.TestPlugin;
+import com.google.gerrit.server.CurrentUser;
+import com.google.gerrit.server.config.AllProjectsNameProvider;
+import com.google.gerrit.server.config.PluginConfigFactory;
+import com.google.gerrit.server.query.change.SubmitRequirementChangeQueryBuilder;
+import com.google.inject.Inject;
+import org.eclipse.jgit.lib.Config;
+import org.junit.Before;
+import org.junit.Test;
+import org.mockito.Mock;
+
+@TestPlugin(name = "task", sysModule = "com.googlesource.gerrit.plugins.task.Modules$Module")
+public class PredicateCacheTest extends LightweightPluginDaemonTest {
+  private static final String PLUGIN = "task";
+
+  @Mock private CurrentUser currentUser;
+  @Inject private SubmitRequirementChangeQueryBuilder srcqb;
+  @Inject private PluginConfigFactory pluginConfigFactory;
+  @Inject private AllProjectsNameProvider allProjectsNameProvider;
+  @Inject private Config config;
+  private TaskPluginConfiguration taskPluginConfiguration;
+  private PredicateCache predicateCache;
+
+  @Before
+  public void setUp() {
+    taskPluginConfiguration =
+        new com.googlesource.gerrit.plugins.task.TaskPluginConfiguration(
+            PLUGIN, config, pluginConfigFactory, allProjectsNameProvider);
+    predicateCache =
+        new com.googlesource.gerrit.plugins.task.PredicateCache(
+            taskPluginConfiguration, currentUser, srcqb);
+  }
+
+  @Test
+  public void isCacheableByBranchTest() throws Exception {
+    assertThat(predicateCache.isCacheableByBranch("project:foo", true)).isTrue();
+    assertThat(predicateCache.isCacheableByBranch("branch:bar", true)).isTrue();
+
+    assertThat(predicateCache.isCacheableByBranch("project:^foo", true)).isTrue();
+    assertThat(predicateCache.isCacheableByBranch("branch:^bar", true)).isTrue();
+
+    assertThat(predicateCache.isCacheableByBranch("project:foo branch:bar", true)).isTrue();
+    assertThat(predicateCache.isCacheableByBranch("project:^foo branch:bar", true)).isTrue();
+    assertThat(predicateCache.isCacheableByBranch("project:foo branch:^bar", true)).isTrue();
+
+    assertThat(predicateCache.isCacheableByBranch("topic:baz", true)).isFalse();
+    assertThat(predicateCache.isCacheableByBranch("label:Code-Review+1", true)).isFalse();
+    assertThat(predicateCache.isCacheableByBranch("topic:baz project:foo", true)).isFalse();
+  }
+}