feat(expressions): add date expression function

tests/src/flextype/core/Entries/Expressions/MathExpressionTest.php

@@ -0,0 +1,33 @@
+<?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('ceil expression', function () {
+    entries()->create('ceil', ['test' => '[[ ceil(42.1) ]]']);
+    expect(entries()->fetch('ceil')['test'])->toBe('43');
+});
+
+test('floor expression', function () {
+    entries()->create('floor', ['test' => '[[ floor(4.3) ]]']);
+    expect(entries()->fetch('floor')['test'])->toBe('4');
+});
+
+test('min expression', function () {
+    entries()->create('min', ['test' => '[[ min(2, 3, 1, 6, 7) ]]']);
+    expect(entries()->fetch('min')['test'])->toBe('1');
+});
+
+test('max expression', function () {
+    entries()->create('max', ['test' => '[[ max(2, 3, 1, 6, 7) ]]']);
+    expect(entries()->fetch('max')['test'])->toBe('7');
+});