diff --git a/test/unit/ShhApiTest.php b/test/unit/ShhApiTest.php
index 602928f..c1a3f34 100644
--- a/test/unit/ShhApiTest.php
+++ b/test/unit/ShhApiTest.php
@@ -3,7 +3,9 @@
 namespace Test\Unit;
 
 use RuntimeException;
+use InvalidArgumentException;
 use Test\TestCase;
+use Web3\Shh;
 
 class ShhApiTest extends TestCase
 {
@@ -463,4 +465,36 @@ class ShhApiTest extends TestCase
     //         $this->assertTrue(true);
     //     });
     // }
+    /**
+     * testUnallowedMethod
+     * 
+     * @return void
+     */
+    public function testUnallowedMethod()
+    {
+        $this->expectException(RuntimeException::class);
+
+        $shh = $this->shh;
+
+        $shh->hello(function ($err, $hello) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            $this->assertTrue(true);
+        });
+    }
+
+    /**
+     * testWrongCallback
+     * 
+     * @return void
+     */
+    public function testWrongCallback()
+    {
+        $this->expectException(InvalidArgumentException::class);
+
+        $shh = $this->shh;
+
+        $shh->version();
+    }
 }
\ No newline at end of file
diff --git a/test/unit/ShhTest.php b/test/unit/ShhTest.php
index f000350..10cca8c 100644
--- a/test/unit/ShhTest.php
+++ b/test/unit/ShhTest.php
@@ -7,6 +7,7 @@ use Test\TestCase;
 use Web3\Providers\HttpProvider;
 use Web3\RequestManagers\RequestManager;
 use Web3\RequestManagers\HttpRequestManager;
+use Web3\Shh;
 
 class ShhTest extends TestCase
 {
@@ -36,7 +37,7 @@ class ShhTest extends TestCase
      */
     public function testInstance()
     {
-        $shh = $this->shh;
+        $shh = new Shh($this->testHost);
 
         $this->assertTrue($shh->provider instanceof HttpProvider);
         $this->assertTrue($shh->provider->requestManager instanceof RequestManager);
@@ -54,5 +55,22 @@ class ShhTest extends TestCase
         $shh->provider = new HttpProvider($requestManager);
 
         $this->assertEquals($shh->provider->requestManager->host, 'http://localhost:8545');
+
+        $shh->provider = null;
+
+        $this->assertEquals($shh->provider->requestManager->host, 'http://localhost:8545');
+    }
+
+    /**
+     * testCallThrowRuntimeException
+     * 
+     * @return void
+     */
+    public function testCallThrowRuntimeException()
+    {
+        $this->expectException(RuntimeException::class);
+
+        $shh = new Shh(null);
+        $shh->post([]);
     }
 }
\ No newline at end of file