add query error test

composer.json

@@ -14,13 +14,20 @@
         "amphp/amp": "^2"
     },
     "require-dev": {
-        "amphp/php-cs-fixer-config": "dev-master"
+        "amphp/php-cs-fixer-config": "dev-master",
+        "amphp/phpunit-util": "^1",
+        "phpunit/phpunit": "^6"
     },
     "autoload": {
         "psr-4": {
             "Amp\\Sql\\": "src"
         }
     },
+    "autoload-dev": {
+        "psr-4": {
+            "Amp\\Sql\\Test\\": "test"
+        }
+    },
     "config": {
         "platform": {
             "php": "7.0.0"

phpunit.xml.dist

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.1/phpunit.xsd"
+        backupGlobals="false"
+        backupStaticAttributes="false"
+        bootstrap="test/bootstrap.php"
+        colors="true"
+        convertErrorsToExceptions="true"
+        convertNoticesToExceptions="true"
+        convertWarningsToExceptions="true"
+        processIsolation="false"
+        stopOnFailure="false"
+>
+    <testsuites>
+        <testsuite name="Amp Sql Client">
+            <directory>test</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory suffix=".php">src</directory>
+        </whitelist>
+    </filter>
+    <listeners>
+        <listener class="Amp\PHPUnit\LoopReset"/>
+    </listeners>
+</phpunit>

src/QueryError.php

@@ -8,7 +8,7 @@ class QueryError extends \Error
 
     public function __construct(string $message, string $query = "", \Throwable $previous = null)
     {
-        if ($query != "") {
+        if ($query !== "") {
             $this->query = $query;
         }
         parent::__construct($message, 0, $previous);

test/QueryErrorTest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Amp\Sql\Test;
+
+use Amp\PHPUnit\TestCase;
+use Amp\Sql\QueryError;
+
+class QueryErrorTest extends TestCase
+{
+    /**
+     * @test
+     */
+    public function it_passed_query_along()
+    {
+        $error = new QueryError('error', 'SELECT * FROM foo');
+
+        $this->assertSame('SELECT * FROM foo', $error->getQuery());
+        $this->assertStringStartsWith("Amp\Sql\QueryError: error\nCurrent query was SELECT * FROM foo", (string) $error);
+    }
+}

test/bootstrap.php

@@ -0,0 +1,3 @@
+<?php
+
+require __DIR__.'/../vendor/autoload.php';