Updates for phpstan 1.0 level 8, fix spaces in config.master.php, add phpunit tets for math, email; update email class with more check methods

4dev/tests/CoreLibsCheckFileTest.php

@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace tests;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Undocumented class
+ * @testdox CoreLibs\Convert\Math method tests
+ */
+final class CoreLibsCheckFileTest extends TestCase
+{
+	protected function setUp(): void
+	{
+		// write a dummy file for testing
+	}
+
+	protected function tearDown(): void
+	{
+		// unlink file
+	}
+
+	public function testGetFilenameEnding(string $input, string $expected): void
+	{
+		// getFilenameEnding
+		$this->assertEquals(
+			$expected,
+			\CoreLibs\Check\File::getFilenameEnding($input)
+		);
+	}
+
+	public function testGetLinesFromFile(): void
+	{
+		// getLinesFromFile
+	}
+}
+
+// __END__