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\DataProvider;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;

#[CoversClass(SvgRenderer::class)]
final class SvgRendererTest extends TestCase
{
    #[Test]
    public function it_returns_an_svg_opening_tag(): void
    {
        $svg = (new SvgRenderer())->render([]);

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

    #[Test]
    public function it_returns_a_closed_svg_element(): void
    {
        $svg = (new SvgRenderer())->render([]);

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

    #[Test]
    public function it_includes_role_img_attribute_for_accessibility(): void
    {
        $svg = (new SvgRenderer())->render([]);

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

    #[Test]
    public function it_includes_aria_label_attribute_for_accessibility(): void
    {
        $svg = (new SvgRenderer())->render([]);

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

    #[Test]
    #[DataProvider('theme_background_provider')]
    public function it_applies_background_color_for_theme(string $theme, string $expectedColor): void
    {
        $svg = (new SvgRenderer())->render([], $theme);

        $this->assertStringContainsString($expectedColor, $svg);
    }

    public static function theme_background_provider(): iterable
    {
        yield 'dark theme'    => ['dark',    '#0d1117'];
        yield 'light theme'   => ['light',   '#ffffff'];
        yield 'unknown theme' => ['unknown', '#0d1117'];
    }

    #[Test]
    public function it_shows_zero_contributions_when_no_data_is_provided(): void
    {
        $svg = (new SvgRenderer())->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');

        $svg = (new SvgRenderer())->render([$today => 1234]);

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

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

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

    #[Test]
    #[DataProvider('day_of_week_label_provider')]
    public function it_renders_day_of_week_label(string $label): void
    {
        $svg = (new SvgRenderer())->render([]);

        $this->assertStringContainsString('>' . $label . '<', $svg);
    }

    public static function day_of_week_label_provider(): iterable
    {
        yield 'Monday'    => ['Mon'];
        yield 'Wednesday' => ['Wed'];
        yield 'Friday'    => ['Fri'];
    }

    #[Test]
    public function it_renders_a_less_label_in_the_legend(): void
    {
        $svg = (new SvgRenderer())->render([]);

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

    #[Test]
    public function it_renders_a_more_label_in_the_legend(): void
    {
        $svg = (new SvgRenderer())->render([]);

        $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');

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

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