Merge pull request #6 from wmde/integer_value_validator

Create integer value validator

src/Validators/IntegerValueValidator.php

@@ -0,0 +1,23 @@
+<?php
+
+declare( strict_types = 1 );
+
+namespace WMDE\FunValidators\Validators;
+
+use WMDE\FunValidators\ConstraintViolation;
+use WMDE\FunValidators\ValidationResult;
+
+/**
+ * @license GNU GPL v2+
+ */
+class IntegerValueValidator {
+
+	public function validate( string $input ): ValidationResult {
+		if ( !ctype_digit( $input ) ) {
+			return new ValidationResult( new ConstraintViolation( $input, 'field_numeric' ) );
+		}
+
+		return new ValidationResult();
+	}
+
+}

tests/Unit/Validators/IntegerValueValidatorTest.php

@@ -0,0 +1,28 @@
+<?php
+
+declare( strict_types = 1 );
+
+namespace WMDE\FunValidators\Tests\Unit\Validators;
+
+use WMDE\FunValidators\Validators\IntegerValueValidator;
+
+/**
+ * @covers \WMDE\FunValidators\Validators\IntegerValueValidator
+ *
+ * @license GNU GPL v2+
+ */
+class IntegerValueValidatorTest extends \PHPUnit\Framework\TestCase {
+
+	public function testGivenIntegerValues_validationSucceeds(): void {
+		$validator = new IntegerValueValidator();
+		$this->assertTrue( $validator->validate( '1234567890' )->isSuccessful() );
+		$this->assertTrue( $validator->validate( '000123456789' )->isSuccessful() );
+	}
+
+	public function testGivenInvalidValues_validationFails(): void {
+		$validator = new IntegerValueValidator();
+		$this->assertFalse( $validator->validate( '-1234567890' )->isSuccessful() );
+		$this->assertFalse( $validator->validate( '21391e213123' )->isSuccessful() );
+		$this->assertFalse( $validator->validate( '21391e213123' )->isSuccessful() );
+	}
+}