diff --git a/Math/Matrix/Matrix.php b/Math/Matrix/Matrix.php
index 14d48fbc9..7af90b442 100755
--- a/Math/Matrix/Matrix.php
+++ b/Math/Matrix/Matrix.php
@@ -297,6 +297,25 @@ class Matrix implements \ArrayAccess, \Iterator
         return $this->matrix;
     }
 
+    /**
+     * Get matrix as 1D array.
+     *
+     * @return array<int, int|float>
+     *
+     * @since 1.0.0
+     */
+    public function toVectorArray() : array
+    {
+        $result = [];
+        for ($i = 0; $i < $this->m; ++$i) {
+            for ($j = 0; $j < $this->n; ++$j) {
+                $result[] = $this->matrix[$i][$j];
+            }
+        }
+
+        return $result;
+    }
+
     /**
      * Is symmetric.
      *
diff --git a/tests/Math/Matrix/VectorTest.php b/tests/Math/Matrix/VectorTest.php
index 4e31ab7f1..70200aa89 100755
--- a/tests/Math/Matrix/VectorTest.php
+++ b/tests/Math/Matrix/VectorTest.php
@@ -78,7 +78,7 @@ final class VectorTest extends \PHPUnit\Framework\TestCase
     {
         self::assertEquals(
             [-15, -2, 39],
-            Vector::fromArray([3, -3, 1])->cross3(Vector::fromArray([4, 9, 2]))->toArray()
+            Vector::fromArray([3, -3, 1])->cross3(Vector::fromArray([4, 9, 2]))->toVectorArray()
         );
     }
 }
diff --git a/tests/Message/RequestAbstractTest.php b/tests/Message/RequestAbstractTest.php
index c317be50d..719d4f448 100755
--- a/tests/Message/RequestAbstractTest.php
+++ b/tests/Message/RequestAbstractTest.php
@@ -149,8 +149,8 @@ final class RequestAbstractTest extends \PHPUnit\Framework\TestCase
     public function testDataDateTimeInputOutput() : void
     {
         $this->request->setData('asdf', '2023-01-01');
-        self::assertEquals((new \DateTime('2023-01-01'))->format('Y-m-d'), $this->request->getDataDateTime('asdf'));
-        self::assertEquals((new \DateTime('2023-01-01'))->format('Y-m-d'), $this->request->getData('asdf', 'float'));
+        self::assertEquals((new \DateTime('2023-01-01'))->format('Y-m-d'), $this->request->getDataDateTime('asdf')->format('Y-m-d'));
+        self::assertEquals((new \DateTime('2023-01-01'))->format('Y-m-d'), $this->request->getData('asdf', 'DateTime')->format('Y-m-d'));
     }
 
     public function testDataInvalidTypeInputOutput() : void
diff --git a/tests/Message/ResponseAbstractTest.php b/tests/Message/ResponseAbstractTest.php
index 52c1fdc92..dd1edf283 100755
--- a/tests/Message/ResponseAbstractTest.php
+++ b/tests/Message/ResponseAbstractTest.php
@@ -70,7 +70,7 @@ final class ResponseAbstractTest extends \PHPUnit\Framework\TestCase
     public function testDataAllInputOutput() : void
     {
         $this->response->set('asdf', false);
-        self::assertFalse(['asdf' => false], $this->response->getData());
+        self::assertEquals(['asdf' => false], $this->response->getData());
     }
 
     /**
@@ -127,7 +127,6 @@ final class ResponseAbstractTest extends \PHPUnit\Framework\TestCase
     {
         $this->response->set('asdf', '[1,2,3]');
         self::assertEquals([1,2,3], $this->response->getDataJson('asdf'));
-        self::assertEquals([1,2,3], $this->response->getData('asdf', 'json'));
     }
 
     /**