diff --git a/tests/Packages/JavaLangStringTest.php b/tests/Packages/JavaLangStringTest.php
index 9dee1928..95b613db 100644
--- a/tests/Packages/JavaLangStringTest.php
+++ b/tests/Packages/JavaLangStringTest.php
@@ -85,6 +85,24 @@ public function testConcat()
         $this->assertEquals('abcdef', $value);
     }
 
+    public function testHashCode()
+    {
+        ob_start();
+        $this->initiatedJavaClasses['JavaLangStringTest']
+            ->getInvoker()
+            ->getStatic()
+            ->getMethods()
+            ->call(
+                'testHashCode'
+            );
+
+        $values = array_filter(explode("\n", ob_get_clean()));
+        $this->assertCount(3, $values);
+        $this->assertSame('2728214739616339340', $values[0]);
+        $this->assertSame('2728214739616339340', $values[1]);
+        $this->assertSame('2728214739616339340', $values[2]);
+    }
+
     public function testReplace()
     {
         ob_start();
diff --git a/tests/Packages/JavaLangSystemTest.php b/tests/Packages/JavaLangSystemTest.php
new file mode 100644
index 00000000..8a339ac3
--- /dev/null
+++ b/tests/Packages/JavaLangSystemTest.php
@@ -0,0 +1,35 @@
+<?php
+namespace PHPJava\Tests\Packages;
+
+use PHPJava\Core\JavaArchive;
+use PHPJava\Tests\Base;
+
+class JavaLangSystemTest extends Base
+{
+    protected $fixtures = [
+        'JavaLangSystemTest',
+    ];
+
+    public function testIdentityHashCode()
+    {
+        ob_start();
+        $this->initiatedJavaClasses['JavaLangSystemTest']
+            ->getInvoker()
+            ->getStatic()
+            ->getMethods()
+            ->call(
+                'identityHashCode'
+            );
+
+        $values = array_filter(explode("\n", ob_get_clean()));
+        $this->assertCount(2, $values);
+
+        $hashCodes = [];
+
+        foreach ($values as $value) {
+            $this->assertIsNumeric($value);
+            $this->assertNotContains($value, $hashCodes);
+            $hashCodes[] = $value;
+        }
+    }
+}
diff --git a/tests/Packages/JavaUtilObjectsTest.php b/tests/Packages/JavaUtilObjectsTest.php
new file mode 100644
index 00000000..5b78a13c
--- /dev/null
+++ b/tests/Packages/JavaUtilObjectsTest.php
@@ -0,0 +1,30 @@
+<?php
+namespace PHPJava\Tests\Packages;
+
+use PHPJava\Core\JavaArchive;
+use PHPJava\Tests\Base;
+
+class JavaUtilObjectsTest extends Base
+{
+    protected $fixtures = [
+        'JavaUtilObjectsTest',
+    ];
+
+    public function testHashCode()
+    {
+        ob_start();
+        $this->initiatedJavaClasses['JavaUtilObjectsTest']
+            ->getInvoker()
+            ->getStatic()
+            ->getMethods()
+            ->call(
+                'testHashCode'
+            );
+
+        $values = array_filter(explode("\n", ob_get_clean()));
+        $this->assertCount(3, $values);
+        $this->assertSame('2728214739616339340', $values[0]);
+        $this->assertSame('2728214739616339340', $values[1]);
+        $this->assertSame('2728214739616339340', $values[2]);
+    }
+}
diff --git a/tests/fixtures/java/JavaLangStringTest.java b/tests/fixtures/java/JavaLangStringTest.java
index c03c0fd5..9ae506a6 100644
--- a/tests/fixtures/java/JavaLangStringTest.java
+++ b/tests/fixtures/java/JavaLangStringTest.java
@@ -10,6 +10,13 @@ public static void concat(String a, String b)
         System.out.print(a.concat(b));
     }
 
+    public static void testHashCode()
+    {
+        System.out.println("hello, world".hashCode());
+        System.out.println("HELLO, WORLD".toLowerCase().hashCode());
+        System.out.println((new String("hello, world")).hashCode());
+    }
+
     public static void replace(String a, String b, String c)
     {
         System.out.print(a.replace(b, c));
diff --git a/tests/fixtures/java/JavaLangSystemTest.java b/tests/fixtures/java/JavaLangSystemTest.java
new file mode 100644
index 00000000..360a4780
--- /dev/null
+++ b/tests/fixtures/java/JavaLangSystemTest.java
@@ -0,0 +1,8 @@
+class JavaLangSystemTest
+{
+    public static void identityHashCode()
+    {
+        System.out.println(System.identityHashCode("Hello, World"));
+        System.out.println(System.identityHashCode(new String("Hello, World")));
+    }
+}
diff --git a/tests/fixtures/java/JavaUtilObjectsTest.java b/tests/fixtures/java/JavaUtilObjectsTest.java
new file mode 100644
index 00000000..a782bb99
--- /dev/null
+++ b/tests/fixtures/java/JavaUtilObjectsTest.java
@@ -0,0 +1,11 @@
+import java.util.Objects;
+
+class JavaUtilObjectsTest
+{
+    public static void testHashCode()
+    {
+        System.out.println(Objects.hashCode("hello, world"));
+        System.out.println(Objects.hashCode("HELLO, WORLD".toLowerCase()));
+        System.out.println(Objects.hashCode(new String("hello, world")));
+    }
+}