new rendering engine

crates/client-domain/tests/render_engine_tests.rs

@@ -0,0 +1,83 @@
+use client_domain::{
+    BoundingBox, Color, DrawCommand, FontMetrics, FontSize, HAlign, RenderEngine,
+    ThemeConfig, VAlign,
+};
+
+fn metrics() -> FontMetrics {
+    FontMetrics {
+        small: (6, 10),
+        large: (10, 20),
+    }
+}
+
+fn theme() -> ThemeConfig {
+    ThemeConfig::default()
+}
+
+fn bounds(w: u16, h: u16) -> BoundingBox {
+    BoundingBox::new(0, 0, w, h)
+}
+
+#[test]
+fn textblock_renders_plain_text() {
+    let engine = RenderEngine::new(metrics(), theme());
+    let cmds = engine.render_text("hello", bounds(100, 40), HAlign::Left, VAlign::Top);
+
+    assert_eq!(cmds.len(), 1);
+    assert_eq!(cmds[0].text, "hello");
+    assert_eq!(cmds[0].x, 0);
+    assert_eq!(cmds[0].y, 0);
+    assert_eq!(cmds[0].color, theme().text);
+    assert_eq!(cmds[0].font, FontSize::Small);
+}
+
+#[test]
+fn text_centered_horizontally() {
+    let engine = RenderEngine::new(metrics(), theme());
+    // "hi" = 12px, bounds = 100px → offset = 44
+    let cmds = engine.render_text("hi", bounds(100, 40), HAlign::Center, VAlign::Top);
+
+    assert_eq!(cmds[0].x, 44);
+}
+
+#[test]
+fn text_centered_vertically() {
+    let engine = RenderEngine::new(metrics(), theme());
+    // 1 line = 10px height, bounds = 40px → offset = 15
+    let cmds = engine.render_text("hi", bounds(100, 40), HAlign::Left, VAlign::Middle);
+
+    assert_eq!(cmds[0].y, 15);
+}
+
+#[test]
+fn text_wraps_and_stacks_lines() {
+    let engine = RenderEngine::new(metrics(), theme());
+    // "hello world" at 40px wide → "hello" + "world", each at 6x10
+    let cmds = engine.render_text("hello world", bounds(40, 100), HAlign::Left, VAlign::Top);
+
+    assert_eq!(cmds.len(), 2);
+    assert_eq!(cmds[0].text, "hello");
+    assert_eq!(cmds[0].y, 0);
+    assert_eq!(cmds[1].text, "world");
+    assert_eq!(cmds[1].y, 10);
+}
+
+#[test]
+fn colored_markup_produces_colored_spans() {
+    let engine = RenderEngine::new(metrics(), theme());
+    let cmds = engine.render_text("{accent}hi{/}", bounds(100, 40), HAlign::Left, VAlign::Top);
+
+    assert_eq!(cmds.len(), 1);
+    assert_eq!(cmds[0].text, "hi");
+    assert_eq!(cmds[0].color, theme().accent);
+}
+
+#[test]
+fn bounds_offset_applied() {
+    let engine = RenderEngine::new(metrics(), theme());
+    let b = BoundingBox::new(10, 20, 100, 40);
+    let cmds = engine.render_text("hi", b, HAlign::Left, VAlign::Top);
+
+    assert_eq!(cmds[0].x, 10);
+    assert_eq!(cmds[0].y, 20);
+}