test(natives): cover vendored syntax definitions in Rust

crates/pi-natives/src/highlight.rs

@@ -494,3 +494,58 @@ pub fn get_supported_languages() -> Vec<String> {
 	let ss = get_syntax_set();
 	ss.syntaxes().iter().map(|s| s.name.clone()).collect()
 }
+
+#[cfg(test)]
+mod tests {
+	use super::*;
+
+	fn test_colors() -> HighlightColors {
+		HighlightColors {
+			comment:     "<c>".to_string(),
+			keyword:     "<k>".to_string(),
+			function:    "<f>".to_string(),
+			variable:    "<v>".to_string(),
+			string:      "<s>".to_string(),
+			number:      "<n>".to_string(),
+			r#type:      "<t>".to_string(),
+			operator:    "<o>".to_string(),
+			punctuation: "<p>".to_string(),
+			inserted:    None,
+			deleted:     None,
+		}
+	}
+
+	#[test]
+	fn highlights_nix_vendored_syntax() {
+		assert!(get_supported_languages().contains(&"Nix".to_string()));
+		assert!(supports_language("nix".to_string()));
+
+		let out = highlight_code(
+			"{ pkgs ? import <nixpkgs> {} }:\nlet message = \"hello\"; in pkgs.writeText \"msg\" \
+			 message # greeting\n"
+				.to_string(),
+			Some("nix".to_string()),
+			test_colors(),
+		);
+		assert!(out.contains("<k>let"));
+		assert!(out.contains("<s>hello"));
+		assert!(out.contains("<c># greeting"));
+	}
+
+	#[test]
+	fn highlights_mermaid_vendored_syntax() {
+		assert!(get_supported_languages().contains(&"Mermaid".to_string()));
+		assert!(supports_language("mermaid".to_string()));
+		assert!(supports_language("mmd".to_string()));
+
+		let out = highlight_code(
+			"graph TD\n  A[\"Start\"] --> B\n  %% note\n".to_string(),
+			Some("mermaid".to_string()),
+			test_colors(),
+		);
+		assert!(out.contains("<k>graph"));
+		assert!(out.contains("<s>Start"));
+		assert!(out.contains("<k>-->"));
+		assert!(out.contains("<c> note"));
+	}
+}

packages/natives/CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Added
 
-- Added Mermaid syntax highlighting support to `highlightCode`/`supportsLanguage` via a vendored `Mermaid.sublime-syntax` and `mermaid`/`mmd` aliases.
+- Added Nix and Mermaid syntax highlighting support to `highlightCode`/`supportsLanguage` via vendored `Nix.sublime-syntax` and `Mermaid.sublime-syntax` definitions plus `nix`, `mermaid`, and `mmd` aliases.
 - Added in-process [uutils](https://github.com/uutils/coreutils)-backed shell builtins to the embedded brush `Shell`: `cat`, `head`, `tail`, `wc`, `sort`, `uniq`, `ls`, `find`, `grep`, `mkdir`, `rm`, and `mv`. These vendored + patched utilities run inside the shell process (no `fork`/`exec`), resolve path operands against the shell working directory, route stdio through the command's (possibly piped/redirected) file descriptors, read the shell's exported environment, and honor abort/timeout cancellation (a blocked `stdin` read unwinds cleanly). `grep` is built on the ripgrep `grep-*` crates and `find` on `uutils/findutils`; the rest are pinned to `uutils/coreutils` 0.8.0 (matching the bundled `uucore`). Registration is gated: set `PI_DISABLE_UUTILS_BUILTINS` to fall back to the system binaries for the whole set, or `PI_DISABLE_UUTILS_DESTRUCTIVE` / `PI_DISABLE_RM_BUILTIN` / `PI_DISABLE_MV_BUILTIN` to disable only the destructive `rm`/`mv` shadows.
 
 ## [16.1.17] - 2026-06-24

packages/natives/test/native.test.ts

@@ -226,54 +226,6 @@ describe("pi-natives", () => {
 			expect(out).toContain("<n>1");
 			expect(out).toContain("<c> add");
 		});
-
-		it("highlights Nix via the vendored syntax", () => {
-			expect(getSupportedLanguages()).toContain("Nix");
-			expect(supportsLanguage("nix")).toBe(true);
-
-			const colors = {
-				comment: "<c>",
-				keyword: "<k>",
-				function: "<f>",
-				variable: "<v>",
-				string: "<s>",
-				number: "<n>",
-				type: "<t>",
-				operator: "<o>",
-				punctuation: "<p>",
-			};
-			const out = highlightCode(
-				'{ pkgs ? import <nixpkgs> {} }:\nlet message = "hello"; in pkgs.writeText "msg" message # greeting\n',
-				"nix",
-				colors,
-			);
-			expect(out).toContain("<k>let");
-			expect(out).toContain("<s>hello");
-			expect(out).toContain("<c># greeting");
-		});
-
-		it("highlights Mermaid via the vendored syntax", () => {
-			expect(getSupportedLanguages()).toContain("Mermaid");
-			expect(supportsLanguage("mermaid")).toBe(true);
-			expect(supportsLanguage("mmd")).toBe(true);
-
-			const colors = {
-				comment: "<c>",
-				keyword: "<k>",
-				function: "<f>",
-				variable: "<v>",
-				string: "<s>",
-				number: "<n>",
-				type: "<t>",
-				operator: "<o>",
-				punctuation: "<p>",
-			};
-			const out = highlightCode('graph TD\n  A["Start"] --> B\n  %% note\n', "mermaid", colors);
-			expect(out).toContain("<k>graph");
-			expect(out).toContain("<s>Start");
-			expect(out).toContain("<k>-->");
-			expect(out).toContain("<c> note");
-		});
 	});
 
 	describe("keys", () => {