diff --git a/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Configuration.java b/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Configuration.java
index 6e340c3..7f34313 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Configuration.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Configuration.java
@@ -33,6 +33,8 @@
 
   public static final String DATABASE_KEY = "database";
   public static final String INSTANCE_KEY = "instance";
+  public static final String EMULATOR_KEY = "useEmulator";
+  public static final String CREDENTIALS_KEY = "credentialsPath";
   public static final String SECTION = "ref-database";
   public static final String SUBSECTION = "spanner";
   private final String spannerInstance;
@@ -45,13 +47,13 @@
     Config cfg = configFactory.getGlobalPluginConfig(pluginName);
     this.spannerInstance = getString(cfg, SECTION, SUBSECTION, INSTANCE_KEY, "spanner-instance");
     this.spannerDatabase = getString(cfg, SECTION, SUBSECTION, DATABASE_KEY, "global-refdb");
-    boolean useEmulator = cfg.getBoolean(SECTION, "useEmulator", false);
+    boolean useEmulator = cfg.getBoolean(SECTION, SUBSECTION, EMULATOR_KEY, false);
     if (useEmulator) {
       this.options = SpannerOptions.newBuilder().build();
       logger.atInfo().log(
           "Using local Spanner emulator for global-refdb; Spanner credentials will not be read.");
     } else {
-      String credentialsPath = getString(cfg, SECTION, null, "credentialsPath", null);
+      String credentialsPath = getString(cfg, SECTION, SUBSECTION, CREDENTIALS_KEY, null);
       GoogleCredentials credentials =
           GoogleCredentials.fromStream(new FileInputStream(credentialsPath));
       this.options = SpannerOptions.newBuilder().setCredentials(credentials).build();
diff --git a/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Lock.java b/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Lock.java
index cb10160..287c9e1 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Lock.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/spannerrefdb/Lock.java
@@ -37,15 +37,15 @@
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 
-/***
- * Locks are a mechanism to ensure exclusive usage of the locked resource. Here we
- * provide a Spanner-specific implementation of locks which are used from the
- * global-refdb module, which is used to ensure refs are updated consistently
- * across multiple Gerrit primary sites (see README.md).
+/**
+ * * Locks are a mechanism to ensure exclusive usage of the locked resource. Here we provide a
+ * Spanner-specific implementation of locks which are used from the global-refdb module, which is
+ * used to ensure refs are updated consistently across multiple Gerrit primary sites (see
+ * README.md).
  *
- * Persistent distributed Locks are used to guard distributed transactions
- * spanning RefUpdates in a git repo of the involved Gerrit primary sites and
- * corresponding updates of those refs in the global-refdb.
+ * <p>Persistent distributed Locks are used to guard distributed transactions spanning RefUpdates in
+ * a git repo of the involved Gerrit primary sites and corresponding updates of those refs in the
+ * global-refdb.
  */
 public class Lock implements AutoCloseable {
   private static final FluentLogger logger = FluentLogger.forEnclosingClass();
diff --git a/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java b/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java
index 4eaaf84..3fa81e9 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/EmulatedSpannerRefDb.java
@@ -15,6 +15,7 @@
 package com.googlesource.gerrit.plugins.spannerrefdb;
 
 import static com.googlesource.gerrit.plugins.spannerrefdb.Configuration.DATABASE_KEY;
+import static com.googlesource.gerrit.plugins.spannerrefdb.Configuration.EMULATOR_KEY;
 import static com.googlesource.gerrit.plugins.spannerrefdb.Configuration.INSTANCE_KEY;
 import static com.googlesource.gerrit.plugins.spannerrefdb.Configuration.SECTION;
 import static com.googlesource.gerrit.plugins.spannerrefdb.Configuration.SUBSECTION;
@@ -45,8 +46,8 @@
 @Ignore
 public class EmulatedSpannerRefDb {
   public static final String PROJECT_ID = "test";
-  public static final String SPANNER_INSTANCE_ID = "instance";
-  public static final String SPANNER_DATABASE_ID = "refdb";
+  public static final String SPANNER_INSTANCE_ID = "spanner-instance";
+  public static final String SPANNER_DATABASE_ID = "global-refdb";
   private static final String pluginName = "spanner-refdb";
 
   private final SpannerEmulatorContainer container;
@@ -141,9 +142,9 @@
 
   private Configuration createEmulatorConfiguration() throws IOException {
     Config refDbConfig = new Config();
-    refDbConfig.setBoolean(Configuration.SECTION, null, "useEmulator", true);
     refDbConfig.setString(SECTION, SUBSECTION, INSTANCE_KEY, SPANNER_INSTANCE_ID);
     refDbConfig.setString(SECTION, SUBSECTION, DATABASE_KEY, SPANNER_DATABASE_ID);
+    refDbConfig.setBoolean(SECTION, SUBSECTION, EMULATOR_KEY, true);
 
     PluginConfigFactory cfgFactory = mock(PluginConfigFactory.class);
     when(cfgFactory.getGlobalPluginConfig(pluginName)).thenReturn(refDbConfig);
diff --git a/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/SpannerRefDatabaseTest.java b/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/SpannerRefDatabaseTest.java
index 607256b..34ef27f 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/SpannerRefDatabaseTest.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/spannerrefdb/SpannerRefDatabaseTest.java
@@ -54,7 +54,7 @@
   }
 
   @Test
-  public void updateRef() throws Exception {
+  public void testUpdateRef() throws Exception {
     createNewRef(PROJECT_NAME_KEY, REF_NAME, OBJECT_ID_1);
     updateRef(PROJECT_NAME_KEY, REF_NAME, OBJECT_ID_1, OBJECT_ID_2);