Class rename, composer add, phpUnit tests add

Rename the class from ReadEnvFile to DotEnv.
Add everything to a composer json file so it can be published to
composer repository.
Add phpUnit tests for system

test/phpUnitTests/DotEnvTest.php

@@ -0,0 +1,122 @@
+<?php
+
+declare(strict_types=1);
+
+namespace tests;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Test class for ACL\Login
+ * @coversDefaultClass \gullevek\DotEnv
+ * @testdox \gullevek\DotEnv method tests
+ */
+final class DotEnvTest extends TestCase
+{
+	/**
+	 * Undocumented function
+	 *
+	 * @return array
+	 */
+	public function envFileProvider(): array
+	{
+		$dot_env_content = [
+			'SOMETHING' => 'A',
+			'OTHER' => 'B IS B',
+			'Complex' => 'A B \"D is F',
+			'HAS_SPACE' => 'ABC',
+			'FAILURE' => 'ABC',
+			'SIMPLEBOX' => 'A B  C',
+			'TITLE' => '1',
+			'FOO' => '1.2',
+			'SOME.TEST' => 'Test Var',
+			'SOME.LIVE' => 'Live Var',
+			'Test' => 'A',
+			'TEST' => 'B',
+			'LINE' => "ABC\nDEF",
+			'OTHERLINE' => "ABC\nAF\"ASFASDF\nMORESHIT",
+			'SUPERLINE' => '',
+			'__FOO_BAR_1' => 'b',
+			'__FOOFOO' => 'f     ',
+			123123 => 'number',
+			'EMPTY' => '',
+		];
+		// 0: folder relative to test folder, if unset __DIR__
+		// 1: file, if unset .env
+		// 2: status to be returned
+		// 3: _ENV file content to be set
+		return [
+			'default' => [
+				'folder' => null,
+				'file' => null,
+				'status' => 3,
+				'content' => [],
+			],
+			'cannot open file' => [
+				'folder' => __DIR__ . DIRECTORY_SEPARATOR . 'dotenv',
+				'file' => 'cannot_read.env',
+				'status' => 2,
+				'content' => [],
+			],
+			'empty file' => [
+				'folder' => __DIR__ . DIRECTORY_SEPARATOR . 'dotenv',
+				'file' => 'empty.env',
+				'status' => 1,
+				'content' => [],
+			],
+			'override all' => [
+				'folder' => __DIR__ . DIRECTORY_SEPARATOR . 'dotenv',
+				'file' => 'test.env',
+				'status' => 0,
+				'content' => $dot_env_content,
+			],
+			'override directory' => [
+				'folder' => __DIR__ . DIRECTORY_SEPARATOR . 'dotenv',
+				'file' => null,
+				'status' => 0,
+				'content' => $dot_env_content,
+			],
+		];
+	}
+
+	/**
+	 * test read .env file
+	 *
+	 * @covers ::readEnvFile
+	 * @dataProvider envFileProvider
+	 * @testdox Read _ENV file from $folder / $file with expected status: $expected_status [$_dataName]
+	 *
+	 * @param  string|null $folder
+	 * @param  string|null $file
+	 * @param  int         $expected_status
+	 * @param  array       $expected_env
+	 * @return void
+	 */
+	public function testReadEnvFile(
+		?string $folder,
+		?string $file,
+		int $expected_status,
+		array $expected_env
+	): void {
+		if ($folder !== null && $file !== null) {
+			$status = \gullevek\dotEnv\DotEnv::readEnvFile($folder, $file);
+		} elseif ($folder !== null) {
+			$status = \gullevek\dotEnv\DotEnv::readEnvFile($folder);
+		} else {
+			$status = \gullevek\dotEnv\DotEnv::readEnvFile();
+		}
+		$this->assertEquals(
+			$status,
+			$expected_status,
+			'Assert returned status equal'
+		);
+		// now assert read data
+		$this->assertEquals(
+			$_ENV,
+			$expected_env,
+			'Assert _ENV correct'
+		);
+	}
+}
+
+// __END__