test: updates tests to use static properties/methods

Author: JasonTheAdams

tests/_support/Helper/MockModel.php

@@ -5,7 +5,7 @@
 use StellarWP\Models\Model;
 
 class MockModel extends Model {
-	protected $properties = [
+	protected static $properties = [
 		'id'           => 'int',
 		'firstName'    => [ 'string', 'Michael' ],
 		'lastName'     => 'string',

tests/wpunit/ModelTest.php

@@ -110,9 +110,7 @@ public function testSetAttributeShouldAssignPropertyValue() {
 	 * @return void
 	 */
 	public function testIsPropertyTypeValidShouldReturnTrueWhenPropertyIsValid() {
-		$model = new MockModel();
-
-		$this->assertTrue( $model->isPropertyTypeValid( 'id', 1 ) );
+		$this->assertTrue( MockModel::isPropertyTypeValid( 'id', 1 ) );
 	}
 
 	/**
@@ -123,9 +121,7 @@ public function testIsPropertyTypeValidShouldReturnTrueWhenPropertyIsValid() {
 	 * @return void
 	 */
 	public function testIsPropertyTypeValidShouldReturnFalseWhenPropertyIsInValid( $key, $value ) {
-		$model = new MockModel();
-
-		$this->assertFalse( $model->isPropertyTypeValid( $key, $value ) );
+		$this->assertFalse( MockModel::isPropertyTypeValid( $key, $value ) );
 	}
 
 	/**