diff --git a/tests/Php70Test.php b/tests/Php70Test.php
index 790238996..8d1344c33 100644
--- a/tests/Php70Test.php
+++ b/tests/Php70Test.php
@@ -17,14 +17,14 @@ class Php70Test extends TestCase
                     function indexof(string $haystack, string $needle) : int
                     {
                         $pos = strpos($haystack, $needle);
-            
+
                         if ($pos === false) {
                             return -1;
                         }
-            
+
                         return $pos;
                     }
-            
+
                     $a = indexof("arr", "a");',
                 'assertions' => [
                     ['int' => '$a'],
@@ -36,15 +36,15 @@ class Php70Test extends TestCase
                         public static function indexof(string $haystack, string $needle) : int
                         {
                             $pos = strpos($haystack, $needle);
-            
+
                             if ($pos === false) {
                                 return -1;
                             }
-            
+
                             return $pos;
                         }
                     }
-            
+
                     $a = Foo::indexof("arr", "a");',
                 'assertions' => [
                     ['int' => '$a'],
@@ -52,11 +52,11 @@ class Php70Test extends TestCase
             ],
             'nullCoalesce' => [
                 '<?php
-                    $a = $_GET["bar"] ?? "nobody";',
+                    $arr = ["hello", "goodbye"];
+                    $a = $arr[rand(0, 10)] ?? null;',
                 'assertions' => [
-                    ['mixed' => '$a'],
+                    ['string|null' => '$a'],
                 ],
-                'error_levels' => ['MixedAssignment'],
             ],
             'spaceship' => [
                 '<?php
@@ -72,7 +72,7 @@ class Php70Test extends TestCase
                         "cat",
                         "bird"
                     ]);
-            
+
                     $a = ANIMALS[1];',
                 'assertions' => [
                     ['string' => '$a'],
@@ -84,17 +84,17 @@ class Php70Test extends TestCase
                         /** @return void */
                         public function log(string $msg);
                     }
-            
+
                     class Application {
                         /** @var Logger|null */
                         private $logger;
-            
+
                         /** @return void */
                         public function setLogger(Logger $logger) {
                              $this->logger = $logger;
                         }
                     }
-            
+
                     $app = new Application;
                     $app->setLogger(new class implements Logger {
                         public function log(string $msg) {
@@ -109,11 +109,11 @@ class Php70Test extends TestCase
                             return 42;
                         }
                     };
-            
+
                     function g(int $i) : int {
                         return $i;
                     }
-            
+
                     $x = g($class->f());',
             ],
             'generatorWithReturn' => [
@@ -126,7 +126,7 @@ class Php70Test extends TestCase
                         if ($i === 1) {
                             return "bash";
                         }
-            
+
                         yield 1;
                     }',
             ],
@@ -144,7 +144,7 @@ class Php70Test extends TestCase
                         yield from seven_eight();
                         return yield from nine_ten();
                     }
-            
+
                     /**
                      * @return Generator<int,int>
                      */
@@ -152,14 +152,14 @@ class Php70Test extends TestCase
                         yield 7;
                         yield from eight();
                     }
-            
+
                     /**
                      * @return Generator<int,int>
                      */
                     function eight() : Generator {
                         yield 8;
                     }
-            
+
                     /**
                      * @return Generator<int,int>
                      * @psalm-generator-return int
@@ -168,7 +168,7 @@ class Php70Test extends TestCase
                         yield 9;
                         return 10;
                     }
-            
+
                     $gen = count_to_ten();
                     foreach ($gen as $num) {
                         echo "$num ";
@@ -184,20 +184,20 @@ class Php70Test extends TestCase
                 '<?php
                     namespace Name\Space {
                         class A {
-            
+
                         }
-            
+
                         class B {
-            
+
                         }
                     }
-            
+
                     namespace Noom\Spice {
                         use Name\Space\{
                             A,
                             B
                         };
-            
+
                         new A();
                         new B();
                     }',
diff --git a/tests/ReferenceConstraintTest.php b/tests/ReferenceConstraintTest.php
index 0dad3aca6..3e84c2122 100644
--- a/tests/ReferenceConstraintTest.php
+++ b/tests/ReferenceConstraintTest.php
@@ -41,13 +41,13 @@ class ReferenceConstraintTest extends TestCase
                     class A {
                       /** @var int */
                       private $foo;
-            
+
                         public function __construct(int &$foo) {
                             $this->foo = &$foo;
                             $foo = "hello";
                         }
                     }
-            
+
                     $bar = 5;
                     $a = new A($bar); // $bar is constrained to an int
                     $bar = null; // ReferenceConstraintViolation issue emitted',
@@ -58,12 +58,12 @@ class ReferenceConstraintTest extends TestCase
                     class A {
                       /** @var int */
                       private $foo;
-            
+
                         public function __construct(int &$foo) {
                             $this->foo = &$foo;
                         }
                     }
-            
+
                     $bar = 5;
                     $a = new A($bar);
                     $bar = null;',
@@ -74,21 +74,21 @@ class ReferenceConstraintTest extends TestCase
                     class A {
                         /** @var int */
                         private $foo;
-            
+
                         public function __construct(int &$foo) {
                             $this->foo = &$foo;
                         }
                     }
-            
+
                     class B {
                         /** @var string */
                         private $bar;
-            
+
                         public function __construct(string &$bar) {
                             $this->bar = &$bar;
                         }
                     }
-            
+
                     if (rand(0, 1)) {
                         $v = 5;
                         $c = (new A($v)); // $v is constrained to an int
@@ -96,7 +96,7 @@ class ReferenceConstraintTest extends TestCase
                         $v = "hello";
                         $c =  (new B($v)); // $v is constrained to a string
                     }
-            
+
                     $v = 8;',
                 'error_message' => 'ConflictingReferenceConstraint',
             ],
diff --git a/tests/ToStringTest.php b/tests/ToStringTest.php
index a562cb20e..fbb8b9a47 100644
--- a/tests/ToStringTest.php
+++ b/tests/ToStringTest.php
@@ -109,7 +109,7 @@ class ToStringTest extends TestCase
                         takesString($i);
                     }',
                 'error_message' => 'ImplicitToStringCast',
-            ]
+            ],
         ];
     }
 }