test: text decoration test

tests/images/text_decorations.png

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8639df22ce9e580c5e75dd1163cf05a79691d18ed49156d173a9e7222db44538
+size 16685

tests/text_decorations.rs

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+use common::DrawTestCfg;
+use cosmic_text::{Attrs, Color, Family, UnderlineStyle};
+
+mod common;
+
+fn base_attrs() -> Attrs<'static> {
+    Attrs::new().family(Family::Name("Noto Sans"))
+}
+
+/// Single test covering all decoration variants:
+/// - Single underline, double underline
+/// - Strikethrough, overline
+/// - Colored underline (red), colored strikethrough (cyan)
+/// - All three combined on one span
+/// - Plain text (no decoration) between spans
+#[test]
+fn test_text_decorations() {
+    let base = base_attrs();
+    let red = Color::rgb(0xFF, 0x00, 0x00);
+    let cyan = Color::rgb(0x00, 0xFF, 0xFF);
+
+    DrawTestCfg::new("text_decorations")
+        .font_size(20., 26.)
+        .font_attrs(base.clone())
+        .rich_text(vec![
+            ("Under ", base.clone().underline(UnderlineStyle::Single)),
+            ("Double ", base.clone().underline(UnderlineStyle::Double)),
+            ("Strike ", base.clone().strikethrough()),
+            ("Over ", base.clone().overline()),
+            (
+                "RedUl ",
+                base.clone()
+                    .underline(UnderlineStyle::Single)
+                    .underline_color(red),
+            ),
+            (
+                "CyanSt ",
+                base.clone().strikethrough().strikethrough_color(cyan),
+            ),
+            (
+                "All",
+                base.clone()
+                    .underline(UnderlineStyle::Single)
+                    .strikethrough()
+                    .overline(),
+            ),
+            (" Plain", base),
+        ])
+        .canvas(600, 50)
+        .validate_text_rendering();
+}