feat(expressions): add new when and unless expressions

tests/src/flextype/core/Parsers/Expressions/UnlessExpressionTest.php

@@ -0,0 +1,26 @@
+<?php
+
+use Flextype\Component\Filesystem\Filesystem;
+use function Glowy\Filesystem\filesystem;
+use function Flextype\entries;
+
+beforeEach(function() {
+    filesystem()->directory(FLEXTYPE_PATH_PROJECT . '/entries')->create();
+});
+
+afterEach(function (): void {
+    filesystem()->directory(FLEXTYPE_PATH_PROJECT . '/entries')->delete();
+});
+
+test('unless expression', function () {
+    
+    entries()->create('unless', [
+        'title' => 'Title',
+
+        'test-unless-positive' => '[[ unless(title == "Foo", "Yes!") ]]',
+        'test-unless-negative' => '[[ unless(title == "Title", "No!") ]]'
+    ]);
+
+    expect(entries()->fetch('unless')['test-unless-positive'])->toBe('Yes!');
+    expect(entries()->fetch('unless')['test-unless-negative'])->toBe('No!');
+});

tests/src/flextype/core/Parsers/Expressions/WhenExpressionTest.php

@@ -0,0 +1,26 @@
+<?php
+
+use Flextype\Component\Filesystem\Filesystem;
+use function Glowy\Filesystem\filesystem;
+use function Flextype\entries;
+
+beforeEach(function() {
+    filesystem()->directory(FLEXTYPE_PATH_PROJECT . '/entries')->create();
+});
+
+afterEach(function (): void {
+    filesystem()->directory(FLEXTYPE_PATH_PROJECT . '/entries')->delete();
+});
+
+test('when expression', function () {
+    
+    entries()->create('when', [
+        'title' => 'Title',
+
+        'test-when-positive' => '[[ when(title == "Title", "Yes!") ]]',
+        'test-when-negative' => '[[ when(title == "Foo", "No!") ]]'
+    ]);
+
+    expect(entries()->fetch('when')['test-when-positive'])->toBe('Yes!');
+    expect(entries()->fetch('when')['test-when-negative'])->toBe('No!');
+});