Added tests for toggle field type

tests/core/Unit/FieldTypes/ToggleFieldTest.php

@@ -0,0 +1,24 @@
+<?php
+
+uses(\Lunar\Tests\Core\TestCase::class);
+use Lunar\Exceptions\FieldTypeException;
+use Lunar\FieldTypes\Toggle;
+
+test('can set value', function () {
+    $field = new Toggle;
+    $field->setValue(false);
+
+    expect($field->getValue())->toEqual(false);
+});
+
+test('can set value in constructor', function () {
+    $field = new Toggle(true);
+
+    expect($field->getValue())->toEqual(true);
+});
+
+test('check it does not allow array', function () {
+    $this->expectException(FieldTypeException::class);
+
+    new Toggle(['foo']);
+});