Tests: Add test for File import

Author: sirbrillig

tests/Sniffs/Imports/FileKeywordFixture.php

@@ -0,0 +1,7 @@
+<?php
+
+use Foo\Bar\File;
+
+function doSomething(File $myFile) {
+  echo $myFile;
+}

tests/Sniffs/Imports/RequireImportsSniffTest.php

@@ -336,4 +336,15 @@ public function testRequireImportsNoticesUnusedConstants() {
 		];
 		$this->assertEquals($expectedLines, $lines);
 	}
+
+	public function testRequireImportsSniffTreatsFileImportAsUsedWhenUsed() {
+		$fixtureFile = __DIR__ . '/FileKeywordFixture.php';
+		$sniffFile = __DIR__ . '/../../../ImportDetection/Sniffs/Imports/RequireImportsSniff.php';
+		$helper = new SniffTestHelper();
+		$phpcsFile = $helper->prepareLocalFileForSniffs($sniffFile, $fixtureFile);
+		$phpcsFile->process();
+		$lines = $helper->getWarningLineNumbersFromFile($phpcsFile);
+		$expectedLines = [];
+		$this->assertEquals($expectedLines, $lines);
+	}
 }