more unit tests, better highlighting

src/tests/highlight.rs

@@ -0,0 +1,27 @@
+
+use insta::assert_snapshot;
+
+use crate::prompt::highlight::FernHighlighter;
+
+use super::super::*;
+
+#[test]
+fn highlight_simple() {
+	let line = "echo foo bar";
+	let styled = FernHighlighter::new(line.to_string()).hl_input();
+	assert_snapshot!(styled)
+}
+
+#[test]
+fn highlight_cmd_sub() {
+	let line = "echo foo $(echo bar)";
+	let styled = FernHighlighter::new(line.to_string()).hl_input();
+	assert_snapshot!(styled)
+}
+
+#[test]
+fn highlight_cmd_sub_in_dquotes() {
+	let line = "echo \"foo $(echo bar) biz\"";
+	let styled = FernHighlighter::new(line.to_string()).hl_input();
+	assert_snapshot!(styled)
+}