Add class-specific tests for CSS\Value\Expression

Author: raxbg

tests/Value/ExpressionTest.php

@@ -0,0 +1,63 @@
+<?php
+
+namespace Sabberworm\CSS\Tests\Value;
+
+use PHPUnit\Framework\TestCase;
+use Sabberworm\CSS\Parsing\ParserState;
+use Sabberworm\CSS\Settings;
+use Sabberworm\CSS\Value\Value;
+use Sabberworm\CSS\Value\ValueList;
+use Sabberworm\CSS\Value\Expression;
+use Sabberworm\CSS\Rule\Rule;
+
+/**
+ * @covers \Sabberworm\CSS\Value\Expression
+ */
+final class ExpressionTest extends TestCase
+{
+    /**
+     * @return array<0, array{string: string}>
+     */
+    public static function provideExpressions(): array
+    {
+        return [
+            [
+                'input' => '(vh - 10) / 2',
+                'expected_output' => '(vh - 10)/2',
+                'expression_index' => 0,
+            ],
+            [
+                'input' => 'max(5, (vh - 10))',
+                'expected_output' => 'max(5,(vh - 10))',
+                'expression_index' => 1
+            ],
+        ];
+    }
+
+    /**
+     * @test
+     *
+     * @dataProvider provideExpressions
+     */
+    public function parseExpressions(string $input, string $expected, int $expression_index): void
+    {
+        $val = Value::parseValue(
+            new ParserState($input, Settings::create()),
+            $this->getDelimiters('height')
+        );
+
+        self::assertInstanceOf(ValueList::class, $val);
+        self::assertInstanceOf(Expression::class, $val->getListComponents()[$expression_index]);
+        self::assertSame($expected, (string) $val);
+    }
+
+    private function getDelimiters(string $rule): array
+    {
+        $closure = function($rule) {
+            return self::listDelimiterForRule($rule);
+        };
+
+        $getter = $closure->bindTo(null, Rule::class);
+        return $getter($rule);
+    }
+}