git-contribution-graph/tests/Unit/Service/SvgRendererTest.php

<?php

declare(strict_types=1);

namespace App\Tests\Unit\Service;

use App\Service\SvgRenderer;
use PHPUnit\Framework\Attributes\CoversClass;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;

#[CoversClass(SvgRenderer::class)]
final class SvgRendererTest extends TestCase
{
    private SvgRenderer $renderer;

    protected function setUp(): void
    {
        $this->renderer = new SvgRenderer();
    }

    #[Test]
    public function it_returns_a_valid_svg_element(): void
    {
        $svg = $this->renderer->render([]);

        $this->assertStringStartsWith('<svg', $svg);
        $this->assertStringEndsWith('</svg>', $svg);
    }

    #[Test]
    public function it_includes_accessibility_attributes(): void
    {
        $svg = $this->renderer->render([]);

        $this->assertStringContainsString('role="img"', $svg);
        $this->assertStringContainsString('aria-label="Contribution graph"', $svg);
    }

    #[Test]
    public function it_applies_dark_theme_background_color(): void
    {
        $svg = $this->renderer->render([], 'dark');

        $this->assertStringContainsString('#0d1117', $svg);
    }

    #[Test]
    public function it_applies_light_theme_background_color(): void
    {
        $svg = $this->renderer->render([], 'light');

        $this->assertStringContainsString('#ffffff', $svg);
    }

    #[Test]
    public function it_falls_back_to_dark_theme_for_unknown_theme_names(): void
    {
        $svg = $this->renderer->render([], 'unknown');

        $this->assertStringContainsString('#0d1117', $svg);
    }

    #[Test]
    public function it_shows_zero_contributions_when_no_data_is_provided(): void
    {
        $svg = $this->renderer->render([]);

        $this->assertStringContainsString('0 contributions in the last year', $svg);
    }

    #[Test]
    public function it_displays_formatted_total_contribution_count(): void
    {
        $today = (new \DateTimeImmutable('today'))->format('Y-m-d');

        $svg = $this->renderer->render([$today => 1234]);

        $this->assertStringContainsString('1,234 contributions in the last year', $svg);
    }

    #[Test]
    public function it_renders_all_53_week_columns(): void
    {
        $svg = $this->renderer->render([]);

        // MARGIN_X(28) + col_52 * STEP(13) = 704
        $this->assertStringContainsString('x="704"', $svg);
    }

    #[Test]
    public function it_renders_day_of_week_labels_matching_github(): void
    {
        $svg = $this->renderer->render([]);

        $this->assertStringContainsString('>Mon<', $svg);
        $this->assertStringContainsString('>Wed<', $svg);
        $this->assertStringContainsString('>Fri<', $svg);
    }

    #[Test]
    public function it_renders_a_legend_with_less_and_more_labels(): void
    {
        $svg = $this->renderer->render([]);

        $this->assertStringContainsString('>Less<', $svg);
        $this->assertStringContainsString('>More<', $svg);
    }

    #[Test]
    public function it_sums_contributions_from_multiple_dates(): void
    {
        $today     = (new \DateTimeImmutable('today'))->format('Y-m-d');
        $yesterday = (new \DateTimeImmutable('yesterday'))->format('Y-m-d');

        $svg = $this->renderer->render([$today => 3, $yesterday => 7]);

        $this->assertStringContainsString('10 contributions in the last year', $svg);
    }
}