Wrote tests for generators.

tests/Keygen/Generators/AlphaNumericGeneratorTest.php

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+<?php
+
+use PHPUnit\Framework\TestCase;
+use Keygen\Generators\AlphaNumericGenerator;
+
+/**
+ * @coversDefaultClass AlphaNumericGenerator
+ */
+final class AlphaNumericGeneratorTest extends TestCase
+{
+	protected $generator;
+
+	protected function setUp()
+	{
+		$this->generator = new AlphaNumericGenerator;
+	}
+
+	/**
+	 * @covers ::keygen
+	 * @covers Keygen\Generator::generate
+	 */
+	public function testKeyGeneration()
+	{
+		$key = $this->generator->generate();
+		$this->assertRegExp('/^[a-zA-Z0-9]{16}$/', $key);
+	}
+}

tests/Keygen/Generators/NumericGeneratorTest.php

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+<?php
+
+use PHPUnit\Framework\TestCase;
+use Keygen\Generators\NumericGenerator;
+
+/**
+ * @coversDefaultClass NumericGenerator
+ */
+final class NumericGeneratorTest extends TestCase
+{
+	protected $generator;
+
+	protected function setUp()
+	{
+		$this->generator = new NumericGenerator;
+	}
+
+	/**
+	 * @covers ::keygen
+	 * @covers Keygen\Generator::generate
+	 */
+	public function testKeyGeneration()
+	{
+		$key = $this->generator->generate();
+		$this->assertRegExp('/^\d{16}$/', $key);
+	}
+}

tests/Keygen/Generators/RandomByteGeneratorTest.php

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+<?php
+
+use PHPUnit\Framework\TestCase;
+use Keygen\Generators\RandomByteGenerator;
+
+/**
+ * @coversDefaultClass RandomByteGenerator
+ */
+final class RandomByteGeneratorTest extends TestCase
+{
+	protected $generator;
+
+	protected function setUp()
+	{
+		$this->generator = new RandomByteGenerator;
+	}
+
+	/**
+	 * @covers ::hex
+	 * @covers ::keygen
+	 * @covers ::generate
+	 * @covers Keygen\Generator::generate
+	 */
+	public function testKeyGeneration()
+	{
+		$key = $this->generator->generate();
+		$this->assertEquals(16, strlen($key));
+
+		$this->assertFalse($this->generator->hex);
+		$hexKey = $this->generator->hex()->generate();
+		$this->assertRegExp('/^[a-f0-9]{16}$/', $hexKey);
+		$this->assertFalse($this->generator->hex);
+	}
+}

tests/Keygen/Generators/TokenGeneratorTest.php

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+<?php
+
+use PHPUnit\Framework\TestCase;
+use Keygen\Generators\TokenGenerator;
+
+/**
+ * @coversDefaultClass TokenGenerator
+ */
+final class TokenGeneratorTest extends TestCase
+{
+	protected $generator;
+
+	protected function setUp()
+	{
+		$this->generator = new TokenGenerator;
+	}
+
+	/**
+	 * @covers ::keygen
+	 * @covers Keygen\Generator::generate
+	 */
+	public function testKeyGeneration()
+	{
+		$key = $this->generator->generate();
+		$this->assertRegExp('/^[a-zA-Z0-9+\/]{16}$/', $key);
+	}
+}