diff --git a/test/Worker/BasicEnvironmentTest.php b/test/Worker/BasicEnvironmentTest.php
index 1e8248f..da0fed1 100644
--- a/test/Worker/BasicEnvironmentTest.php
+++ b/test/Worker/BasicEnvironmentTest.php
@@ -31,18 +31,18 @@ class BasicEnvironmentTest extends TestCase {
         $environment = new BasicEnvironment;
         $key = "key";
 
-        $this->assertFalse(isset($environment[$key]));
+        $this->assertArrayNotHasKey($key, $environment);
         $this->assertNull($environment[$key]);
 
         $environment[$key] = 1;
-        $this->assertTrue(isset($environment[$key]));
+        $this->assertArrayHasKey($key, $environment);
         $this->assertSame(1, $environment[$key]);
 
         $environment[$key] = 2;
         $this->assertSame(2, $environment[$key]);
 
         unset($environment[$key]);
-        $this->assertFalse(isset($environment[$key]));
+        $this->assertArrayNotHasKey($key, $environment);
         $this->assertNull($environment[$key]);
     }
 
diff --git a/test/Worker/FunctionsTest.php b/test/Worker/FunctionsTest.php
index 2369625..bcd3009 100644
--- a/test/Worker/FunctionsTest.php
+++ b/test/Worker/FunctionsTest.php
@@ -17,7 +17,7 @@ class FunctionsTest extends TestCase {
 
         Worker\pool($pool);
 
-        $this->assertTrue($pool === Worker\pool());
+        $this->assertSame(Worker\pool(), $pool);
     }
 
     /**
@@ -60,7 +60,7 @@ class FunctionsTest extends TestCase {
 
         Worker\factory($factory);
 
-        $this->assertTrue($factory === Worker\factory());
+        $this->assertSame(Worker\factory(), $factory);
     }
 
     /**