diff --git a/tests/PHPStan/Command/ErrorFormatter/BaselinePhpErrorFormatterTest.php b/tests/PHPStan/Command/ErrorFormatter/BaselinePhpErrorFormatterTest.php
new file mode 100644
index 0000000000..d69bfadc36
--- /dev/null
+++ b/tests/PHPStan/Command/ErrorFormatter/BaselinePhpErrorFormatterTest.php
@@ -0,0 +1,79 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Command\ErrorFormatter;
+
+use PHPStan\Analyser\Error;
+use PHPStan\Command\AnalysisResult;
+use PHPStan\File\ParentDirectoryRelativePathHelper;
+use PHPStan\Testing\ErrorFormatterTestCase;
+
+class BaselinePhpErrorFormatterTest extends ErrorFormatterTestCase
+{
+
+	public function dataFormatErrors(): iterable
+	{
+		yield [
+			[
+				new Error(
+					'Foo',
+					__DIR__ . '/Foo.php',
+					5,
+				),
+				new Error(
+					'Foo',
+					__DIR__ . '/Foo.php',
+					5,
+				),
+				new Error(
+					'Bar',
+					__DIR__ . '/../Foo.php',
+					5,
+				),
+			],
+			<<<'PHP'
+<?php declare(strict_types = 1);
+
+$ignoreErrors = [];
+$ignoreErrors[] = [
+	'message' => '#^Bar$#',
+	'count' => 1,
+	'path' => __DIR__ . '/../Foo.php',
+];
+$ignoreErrors[] = [
+	'message' => '#^Foo$#',
+	'count' => 2,
+	'path' => __DIR__ . '/Foo.php',
+];
+
+return ['parameters' => ['ignoreErrors' => $ignoreErrors]];
+
+PHP,
+		];
+	}
+
+	/**
+	 * @dataProvider dataFormatErrors
+	 * @param list<Error> $errors
+	 */
+	public function testFormatErrors(array $errors, string $expectedOutput): void
+	{
+		$formatter = new BaselinePhpErrorFormatter(new ParentDirectoryRelativePathHelper(__DIR__));
+		$formatter->formatErrors(
+			new AnalysisResult(
+				$errors,
+				[],
+				[],
+				[],
+				[],
+				false,
+				null,
+				true,
+				0,
+			),
+			$this->getOutput(),
+		);
+
+		$this->assertSame($expectedOutput, $this->getOutputContent());
+	}
+
+}