diff --git a/tests/Crypt/RSA/LoadKeyTest.php b/tests/Crypt/RSA/LoadKeyTest.php
index 23594c01..55d2face 100644
--- a/tests/Crypt/RSA/LoadKeyTest.php
+++ b/tests/Crypt/RSA/LoadKeyTest.php
@@ -36,7 +36,8 @@ U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ
 37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=
 -----END RSA PRIVATE KEY-----';
 
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPrivateKey()));
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPrivateKey());
     }
 
     public function testPKCS1SpacesKey()
@@ -58,7 +59,8 @@ U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ
 -----END RSA PRIVATE KEY-----';
         $key = str_replace(array("\r", "\n", "\r\n"), ' ', $key);
 
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPrivateKey()));
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPrivateKey());
     }
 
     public function testPKCS1NoHeaderKey()
@@ -77,7 +79,8 @@ X6zk7S0ljKtt2jny2+00VsBerQJBAJGC1Mg5Oydo5NwD6BiROrPxGo2bpTbu/fhrT8ebHkTz2epl
 U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ
 37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=';
 
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPrivateKey()));
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPrivateKey());
     }
 
     public function testPKCS1NoWhitespaceNoHeaderKey()
@@ -95,7 +98,9 @@ U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ
                'X6zk7S0ljKtt2jny2+00VsBerQJBAJGC1Mg5Oydo5NwD6BiROrPxGo2bpTbu/fhrT8ebHkTz2epl' .
                'U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ' .
                '37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=';
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPrivateKey()));
+
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPrivateKey());
     }
 
     public function testRawPKCS1Key()
@@ -115,7 +120,8 @@ U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ
                '37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=';
         $key = base64_decode($key);
 
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPrivateKey()));
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPrivateKey());
     }
 
     public function testPubKey1()
@@ -131,7 +137,9 @@ gPiUWOPatVkt7+Bs3h5Ramxh7XjBOXeulmCpGSynXNcpZ/06+vofGi/2MlpQZNhH
 Ao8eayMp6FcvNucIpUndo1X8dKMv3Y26ZQIDAQAB
 -----END RSA PUBLIC KEY-----';
 
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPublicKey()) && $rsa->getPrivateKey() === false);
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPublicKey());
+        $this->assertFalse($rsa->getPrivateKey());
     }
 
     public function testPubKey2()
@@ -148,10 +156,12 @@ lmCpGSynXNcpZ/06+vofGi/2MlpQZNhHAo8eayMp6FcvNucIpUndo1X8dKMv3Y26
 ZQIDAQAB
 -----END PUBLIC KEY-----';
 
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPublicKey()) && $rsa->getPrivateKey() === false);
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPublicKey());
+        $this->assertFalse($rsa->getPrivateKey());
     }
 
-    public function testPubKey3()
+    public function testSSHPubKey()
     {
         $rsa = new Crypt_RSA();
 
@@ -160,7 +170,9 @@ ZQIDAQAB
                'GkVb1/3j+skZ6UtW+5u09lHNsj6tQ51s1SPrCBkedbNf0Tp0GbMJDyR4e9T04ZZw== ' .
                'phpseclib-generated-key';
 
-        $this->assertTrue($rsa->loadKey($key) && is_string($rsa->getPublicKey()) && $rsa->getPrivateKey() === false);
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertInternalType('string', $rsa->getPublicKey());
+        $this->assertFalse($rsa->getPrivateKey());
     }
 
     public function testSetPrivate()
@@ -176,6 +188,9 @@ gPiUWOPatVkt7+Bs3h5Ramxh7XjBOXeulmCpGSynXNcpZ/06+vofGi/2MlpQZNhH
 Ao8eayMp6FcvNucIpUndo1X8dKMv3Y26ZQIDAQAB
 -----END RSA PUBLIC KEY-----';
 
-        $this->assertTrue($rsa->loadKey($key) && $rsa->setPrivateKey() && is_string("$rsa") && $rsa->getPublicKey() === false);
+        $this->assertTrue($rsa->loadKey($key));
+        $this->assertTrue($rsa->setPrivateKey());
+        $this->assertGreaterThanOrEqual(1, strlen("$rsa"));
+        $this->assertFalse($rsa->getPublicKey());
     }
 }