added missing return types

src/Concerns/TestCase.php

@@ -129,12 +129,21 @@ trait TestCase
 
     /**
      * Runs the test.
+     *
+     * @return mixed
+     *
+     * @throws \Throwable
      */
     public function __test()
     {
         return $this->__callClosure($this->__test, func_get_args());
     }
 
+    /**
+     * @return mixed
+     *
+     * @throws \Throwable
+     */
     private function __callClosure(Closure $closure, array $arguments)
     {
         return ExceptionTrace::ensure(function () use ($closure, $arguments) {

src/Factories/TestCaseFactory.php

@@ -132,6 +132,9 @@ final class TestCaseFactory
         $proxies     = $this->proxies;
         $factoryTest = $this->test;
 
+        /**
+         * @return mixed
+         */
         $test = function () use ($chains, $proxies, $factoryTest) {
             $proxies->proxy($this);
             $chains->chain($this);

src/Support/ExceptionTrace.php

@@ -17,6 +17,10 @@ final class ExceptionTrace
     /**
      * Ensures the given closure reports
      * the good execution context.
+     *
+     * @return mixed
+     *
+     * @throws \Throwable
      */
     public static function ensure(Closure $closure)
     {