diff --git a/modules/Gem/pom.xml b/modules/Gem/pom.xml
index 6476837..eaa98ad 100644
--- a/modules/Gem/pom.xml
+++ b/modules/Gem/pom.xml
@@ -64,7 +64,7 @@
         </repository>
         <repository>
             <id>placeholderapi</id>
-            <url>https://repo.extendedclip.com/content/repositories/placeholderapi/</url>
+            <url>https://repo.helpch.at/releases/</url>
         </repository>
     </repositories>
 
@@ -78,8 +78,38 @@
         <dependency>
             <groupId>me.clip</groupId>
             <artifactId>placeholderapi</artifactId>
-            <version>2.11.1</version>
+            <version>2.11.5</version>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.13.2</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>5.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-inline</artifactId>
+            <version>5.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy</artifactId>
+            <version>1.14.19</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>net.bytebuddy</groupId>
+            <artifactId>byte-buddy-agent</artifactId>
+            <version>1.14.19</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>
diff --git a/modules/Gem/src/main/java/com/mcatk/gem/GemExecutor.java b/modules/Gem/src/main/java/com/mcatk/gem/GemExecutor.java
index 0fe8194..30f9dc6 100644
--- a/modules/Gem/src/main/java/com/mcatk/gem/GemExecutor.java
+++ b/modules/Gem/src/main/java/com/mcatk/gem/GemExecutor.java
@@ -44,7 +44,7 @@ public Integer getTotalGems(String name) {
 
     public void addGems(String name, int addGems) {
         Integer gems = MySQLManager.getInstance().getGems(name);
-        if (MySQLManager.getInstance().getGems(name) == null) {
+        if (gems == null) {
             MySQLManager.getInstance().insertData(name);
             gems = 0;
         }
diff --git a/modules/Gem/src/test/java/com/mcatk/gem/GemExecutorTest.java b/modules/Gem/src/test/java/com/mcatk/gem/GemExecutorTest.java
new file mode 100644
index 0000000..330152c
--- /dev/null
+++ b/modules/Gem/src/test/java/com/mcatk/gem/GemExecutorTest.java
@@ -0,0 +1,79 @@
+package com.mcatk.gem;
+
+import com.mcatk.gem.sql.MySQLManager;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.junit.MockitoJUnitRunner;
+
+import java.lang.reflect.Field;
+import java.util.logging.Logger;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.Mockito.*;
+
+@RunWith(MockitoJUnitRunner.class)
+public class GemExecutorTest {
+
+    @Mock
+    private MySQLManager mySQLManagerMock;
+
+    @Mock
+    private Gem gemMock;
+
+    private GemExecutor gemExecutor;
+
+    @Before
+    public void setUp() throws Exception {
+        // Mock MySQLManager.instance
+        setStaticField(MySQLManager.class, "instance", mySQLManagerMock);
+
+        // Mock Gem.plugin
+        setStaticField(Gem.class, "plugin", gemMock);
+
+        gemExecutor = new GemExecutor();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        setStaticField(MySQLManager.class, "instance", null);
+        setStaticField(Gem.class, "plugin", null);
+    }
+
+    private void setStaticField(Class<?> clazz, String fieldName, Object value) throws Exception {
+        Field field = clazz.getDeclaredField(fieldName);
+        field.setAccessible(true);
+        field.set(null, value);
+    }
+
+    @Test
+    public void testAddGems_Performance() {
+        String playerName = "TestPlayer";
+        int gemsToAdd = 100;
+
+        // Simulate new user: getGems returns null
+        when(mySQLManagerMock.getGems(playerName)).thenReturn(null);
+
+        // Mock getTotal to return a value (e.g. 0)
+        when(mySQLManagerMock.getTotal(playerName)).thenReturn(0);
+
+        gemExecutor.addGems(playerName, gemsToAdd);
+
+        // Verify getGems is called exactly ONCE (target behavior)
+        verify(mySQLManagerMock, times(1)).getGems(playerName);
+
+        // Verify insertData is called
+        verify(mySQLManagerMock).insertData(playerName);
+
+        // Verify update calls
+        verify(mySQLManagerMock).setGems(eq(playerName), eq(gemsToAdd));
+        verify(mySQLManagerMock).setTotal(eq(playerName), eq(gemsToAdd));
+
+        // Verify log
+        verify(gemMock).log(anyString());
+    }
+}