diff --git a/tests/LaboratoryTest.php b/tests/LaboratoryTest.php
index 9283fa0..7e25063 100644
--- a/tests/LaboratoryTest.php
+++ b/tests/LaboratoryTest.php
@@ -52,7 +52,7 @@ public function test_laboratory_can_fetch_report_for_experiment_with_no_journals
 
     public function test_that_exceptions_are_thrown_within_control()
     {
-        $this->setExpectedException(Exception::class);
+        $this->expectException(Exception::class);
 
         $v = (new Laboratory)
             ->experiment('test experiment')
diff --git a/tests/MachineTest.php b/tests/MachineTest.php
index 0b2d694..7b80c85 100644
--- a/tests/MachineTest.php
+++ b/tests/MachineTest.php
@@ -7,17 +7,23 @@ class MachineTest extends \PHPUnit\Framework\TestCase
 {
     public function test_that_machine_can_be_created()
     {
-        new Machine(function () {});
+        $m = new Machine(function () {});
+            
+        $this->assertInstanceOf(Machine::class, $m);
     }
 
     public function test_that_machine_can_receive_parameters()
     {
-        new Machine(function () {}, [1, 2, 3]);
+        $m = new Machine(function () {}, [1, 2, 3]);
+
+        $this->assertInstanceOf(Machine::class, $m);
     }
 
     public function test_that_machine_can_receive_mutable_state()
     {
-        new Machine(function () {}, [1, 2, 3], true);
+        $m = new Machine(function () {}, [1, 2, 3], true);
+
+        $this->assertInstanceOf(Machine::class, $m);
     }
 
     public function test_that_machine_can_produce_a_result()
@@ -47,7 +53,7 @@ public function test_that_exceptions_can_be_thrown_by_machine_callback_execution
     {
         $m = new Machine(function () { throw new Exception('foo'); });
 
-        $this->setExpectedException(Exception::class);
+        $this->expectException(Exception::class);
 
         $m->execute();
     }
diff --git a/tests/ReportTest.php b/tests/ReportTest.php
index 9bf12af..7db8950 100644
--- a/tests/ReportTest.php
+++ b/tests/ReportTest.php
@@ -8,7 +8,9 @@ class ReportTest extends \PHPUnit\Framework\TestCase
     public function test_that_report_can_be_created()
     {
         $r = new Result;
-        new Report('foo', $r, []);
+        $rep = new Report('foo', $r, []);
+
+        $this->assertInstanceOf(Report::class, $rep);
     }
 
     public function test_that_report_can_hold_experiment_name()
diff --git a/tests/ResultTest.php b/tests/ResultTest.php
index 8739c5d..7fb3335 100644
--- a/tests/ResultTest.php
+++ b/tests/ResultTest.php
@@ -6,7 +6,9 @@ class ResultTest extends \PHPUnit\Framework\TestCase
 {
     public function test_result_can_be_created()
     {
-        new Result;
+        $r = new Result;
+        
+        $this->assertInstanceOf(Result::class, $r);
     }
 
     public function test_result_can_have_value()