diff --git a/java/com/google/gerrit/plugins/codeowners/acceptance/AbstractCodeOwnersTest.java b/java/com/google/gerrit/plugins/codeowners/acceptance/AbstractCodeOwnersTest.java
index 2f1be86..e06e1bb 100644
--- a/java/com/google/gerrit/plugins/codeowners/acceptance/AbstractCodeOwnersTest.java
+++ b/java/com/google/gerrit/plugins/codeowners/acceptance/AbstractCodeOwnersTest.java
@@ -16,6 +16,7 @@
 
 import static com.google.gerrit.server.group.SystemGroupBackend.REGISTERED_USERS;
 
+import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.gerrit.acceptance.GitUtil;
 import com.google.gerrit.acceptance.LightweightPluginDaemonTest;
@@ -40,6 +41,7 @@
 import com.google.inject.Inject;
 import java.nio.file.Path;
 import java.util.Map;
+import java.util.function.Consumer;
 import org.eclipse.jgit.internal.storage.dfs.InMemoryRepository;
 import org.eclipse.jgit.junit.TestRepository;
 import org.eclipse.jgit.lib.Config;
@@ -145,9 +147,30 @@
   protected void setCodeOwnersConfig(
       Project.NameKey project, @Nullable String subsection, String key, String value)
       throws Exception {
+    updateCodeOwnersConfig(
+        project,
+        codeOwnersConfig ->
+            codeOwnersConfig.setString(
+                CodeOwnersPluginConfiguration.SECTION_CODE_OWNERS, subsection, key, value));
+  }
+
+  protected void setCodeOwnersConfig(
+      Project.NameKey project,
+      @Nullable String subsection,
+      String key,
+      ImmutableList<String> values)
+      throws Exception {
+    updateCodeOwnersConfig(
+        project,
+        codeOwnersConfig ->
+            codeOwnersConfig.setStringList(
+                CodeOwnersPluginConfiguration.SECTION_CODE_OWNERS, subsection, key, values));
+  }
+
+  private void updateCodeOwnersConfig(Project.NameKey project, Consumer<Config> configUpdater)
+      throws Exception {
     Config codeOwnersConfig = new Config();
-    codeOwnersConfig.setString(
-        CodeOwnersPluginConfiguration.SECTION_CODE_OWNERS, subsection, key, value);
+    configUpdater.accept(codeOwnersConfig);
     try (TestRepository<Repository> testRepo =
         new TestRepository<>(repoManager.openRepository(project))) {
       Ref ref = testRepo.getRepository().exactRef(RefNames.REFS_CONFIG);
diff --git a/javatests/com/google/gerrit/plugins/codeowners/config/CodeOwnersPluginConfigurationTest.java b/javatests/com/google/gerrit/plugins/codeowners/config/CodeOwnersPluginConfigurationTest.java
index 7c6ab3a..dab2b0d 100644
--- a/javatests/com/google/gerrit/plugins/codeowners/config/CodeOwnersPluginConfigurationTest.java
+++ b/javatests/com/google/gerrit/plugins/codeowners/config/CodeOwnersPluginConfigurationTest.java
@@ -19,6 +19,7 @@
 import static com.google.gerrit.testing.GerritJUnit.assertThrows;
 import static com.google.gerrit.truth.OptionalSubject.assertThat;
 
+import com.google.common.collect.ImmutableList;
 import com.google.gerrit.acceptance.config.GerritConfig;
 import com.google.gerrit.acceptance.testsuite.project.ProjectOperations;
 import com.google.gerrit.common.Nullable;
@@ -535,6 +536,20 @@
   }
 
   @Test
+  public void getRequiredApprovalMultipleConfiguredOnProjectLevel() throws Exception {
+    setCodeOwnersConfig(
+        project,
+        /* subsection= */ null,
+        RequiredApprovalConfig.KEY_REQUIRED_APPROVAL,
+        ImmutableList.of("Code-Review+2", "Code-Review+1"));
+
+    // If multiple values are set for a key, the last value wins.
+    RequiredApproval requiredApproval = codeOwnersPluginConfiguration.getRequiredApproval(project);
+    assertThat(requiredApproval).hasLabelNameThat().isEqualTo("Code-Review");
+    assertThat(requiredApproval).hasValueThat().isEqualTo(1);
+  }
+
+  @Test
   @GerritConfig(name = "plugin.code-owners.requiredApproval", value = "Code-Review+1")
   public void requiredApprovalConfiguredOnProjectLevelOverridesDefaultRequiredApproval()
       throws Exception {
@@ -675,6 +690,22 @@
   }
 
   @Test
+  public void getOverrideApprovalMultipleConfiguredOnProjectLevel() throws Exception {
+    setCodeOwnersConfig(
+        project,
+        /* subsection= */ null,
+        OverrideApprovalConfig.KEY_OVERRIDE_APPROVAL,
+        ImmutableList.of("Code-Review+2", "Code-Review+1"));
+
+    // If multiple values are set for a key, the last value wins.
+    Optional<RequiredApproval> requiredApproval =
+        codeOwnersPluginConfiguration.getOverrideApproval(project);
+    assertThat(requiredApproval).isPresent();
+    assertThat(requiredApproval).value().hasLabelNameThat().isEqualTo("Code-Review");
+    assertThat(requiredApproval).value().hasValueThat().isEqualTo(1);
+  }
+
+  @Test
   @GerritConfig(name = "plugin.code-owners.overrideApproval", value = "INVALID")
   public void getOverrideApprovalIfInvalidOverrideApprovalIsConfigured() throws Exception {
     assertThat(codeOwnersPluginConfiguration.getOverrideApproval(project)).isEmpty();