diff --git a/src/main/java/br/unicamp/cst/memorystorage/LamportTime.java b/src/main/java/br/unicamp/cst/memorystorage/LamportTime.java
index 57531b4..8a95df0 100644
--- a/src/main/java/br/unicamp/cst/memorystorage/LamportTime.java
+++ b/src/main/java/br/unicamp/cst/memorystorage/LamportTime.java
@@ -51,7 +51,7 @@ public String toString()
 
     
     public static LamportTime synchronize(LogicalTime time0, LogicalTime time1) {
-        if(!(LogicalTime.class.isInstance(time0) && LogicalTime.class.isInstance(time1))){
+        if(!(LamportTime.class.isInstance(time0) && LamportTime.class.isInstance(time1))){
             throw new IllegalArgumentException("LamportTime can only synchonize LamportTime instances");
         }
         
diff --git a/src/test/java/br/unicamp/cst/memorystorage/LamportTimeTest.java b/src/test/java/br/unicamp/cst/memorystorage/LamportTimeTest.java
index e832882..596cb00 100644
--- a/src/test/java/br/unicamp/cst/memorystorage/LamportTimeTest.java
+++ b/src/test/java/br/unicamp/cst/memorystorage/LamportTimeTest.java
@@ -1,6 +1,9 @@
 package br.unicamp.cst.memorystorage;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import org.junit.jupiter.api.Test;
 
@@ -53,5 +56,57 @@ public void synchronizeTest()
         assertTrue(time0.lessThan(timeS));
         assertTrue(time1.lessThan(timeS));
         assertEquals(56, timeS.getTime());
+
+        LamportTime timeS2 = LamportTime.synchronize(time1, time0);
+
+        assertTrue(time0.lessThan(timeS2));
+        assertTrue(time1.lessThan(timeS2));
+        assertEquals(56, timeS2.getTime());
+    }
+
+    @Test
+    public void equalsTest()
+    {
+        LamportTime time0 = new LamportTime(0);
+        LamportTime time1 = new LamportTime(1);
+        LamportTime time2 = new LamportTime(1);
+
+        assertNotEquals(time0, time1);
+        assertEquals(time1, time2);
+    }
+
+    @Test
+    public void lessThanTest()
+    {
+        LamportTime time0 = new LamportTime(0);
+        LamportTime time1 = new LamportTime(1);
+        LamportTime time2 = new LamportTime(2);
+
+        assertTrue(time0.lessThan(time1));
+        assertFalse(time2.lessThan(time1));
+    }
+
+    @Test
+    public void synchonizeNonLamportTest()
+    {
+        LogicalTime logicalTime = new LogicalTime() {
+
+            @Override
+            public LogicalTime increment() {
+                throw new UnsupportedOperationException("Unimplemented method 'increment'");
+            }
+
+            @Override
+            public boolean lessThan(Object o) {
+                throw new UnsupportedOperationException("Unimplemented method 'lessThan'");
+            }
+            
+        };
+
+        LamportTime lamportTime = new LamportTime();
+
+        assertThrows(IllegalArgumentException.class, () -> LamportTime.synchronize(lamportTime, logicalTime));
+        assertThrows(IllegalArgumentException.class, () -> LamportTime.synchronize(logicalTime, lamportTime));
+
     }
 }