added unit test

Author: staabm

src/Php/PhpVersions.php

@@ -20,7 +20,7 @@ public function __construct(
 
 	public function producesWarningForFinalPrivateMethods(): TrinaryLogic
 	{
-		return $this->phpVersions->isSuperTypeOf(IntegerRangeType::fromInterval(80000, null))->result;
+		return IntegerRangeType::fromInterval(80000, null)->isSuperTypeOf($this->phpVersions)->result;
 	}
 
 }

tests/PHPStan/Php/PhpVersionsTest.php

@@ -0,0 +1,64 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Php;
+
+use PHPStan\TrinaryLogic;
+use PHPStan\Type\IntegerRangeType;
+use PHPStan\Type\Type;
+use PHPStan\Type\Constant\ConstantIntegerType;
+use PHPStan\Type\UnionType;
+use PHPUnit\Framework\TestCase;
+
+class PhpVersionsTest extends TestCase
+{
+	/**
+	 * @dataProvider dataProducesWarningForFinalPrivateMethods
+	 */
+	public function testProducesWarningForFinalPrivateMethods(TrinaryLogic $expected, Type $versionType ) {
+		$phpVersions = new PhpVersions($versionType);
+		$this->assertSame(
+			$expected->describe(),
+			$phpVersions->producesWarningForFinalPrivateMethods()->describe()
+		);
+	}
+
+	public function dataProducesWarningForFinalPrivateMethods(): iterable {
+		yield [
+			TrinaryLogic::createNo(),
+			new ConstantIntegerType(70400),
+		];
+
+		yield [
+			TrinaryLogic::createYes(),
+			new ConstantIntegerType(80000),
+		];
+
+		yield [
+			TrinaryLogic::createYes(),
+			new ConstantIntegerType(80100),
+		];
+
+		yield [
+			TrinaryLogic::createYes(),
+			IntegerRangeType::fromInterval(80000, null)
+		];
+
+		yield [
+			TrinaryLogic::createMaybe(),
+			IntegerRangeType::fromInterval(null, 80000)
+		];
+
+		yield [
+			TrinaryLogic::createNo(),
+			IntegerRangeType::fromInterval(70200, 70400)
+		];
+
+		yield [
+			TrinaryLogic::createMaybe(),
+			new UnionType([
+				IntegerRangeType::fromInterval(70200, 70400),
+				IntegerRangeType::fromInterval(80200, 80400),
+			])
+		];
+	}
+}