Added testing

tests/ResultSetTest.php

@@ -0,0 +1,26 @@
+<?php
+use PHPUnit\Framework\TestCase;
+
+use ProVM\Database\ResultSet;
+
+class ResultSetTest extends TestCase
+{
+    public function testResultSet()
+    {
+        $result1 = ['col1', 'col2', 'col3'];
+        $result2 = [['col1', 'col2'], ['col3', 'col4']];
+
+        $statement = $this->getMockBuilder(PDOStatement::class)->getMock();
+        $statement->method('execute')->willReturn(true);
+        $statement->method('fetch')->willReturn($result1);
+        $statement->method('fetchAll')->willReturn($result2);
+        $statement->method('rowCount')->willReturn(2);
+
+        $resultSet = new ResultSet($statement);
+
+        $resultSet->execute(['foo' => 'bar']);
+        $this->assertTrue(true);
+        $this->assertEquals($result1, $resultSet->fetchFirst());
+        $this->assertEquals($result2, $resultSet->fetchAll());
+    }
+}