better error messages for parse test

1 files changed, 18 insertions, 6 deletions

diff --git a/src/parse/test.rs b/src/parse/test.rs
index 6cd7793..9352cfd 100644
--- a/src/parse/test.rs
+++ b/src/parse/test.rs
@@ -4,13 +4,25 @@ fn parse(x: &[u8]) -> Ast<PreExpansion> {
     do_parse(x).unwrap()
 }
 
+fn parse_test(l: Ast<PreExpansion>, r: Ast<PreExpansion>) {
+    if l != r {
+        let mut left = Vec::new();
+        l.cdisplay(&mut left).unwrap();
+        let mut right = Vec::new();
+        r.cdisplay(&mut right).unwrap();
+        let left = String::from_utf8_lossy(&left);
+        let right = String::from_utf8_lossy(&right);
+        panic!("parse equality error\nleft: {left}\nright: {right}")
+    }
+}
+
 #[test]
 fn command_interp() {
-    assert_eq!(
-        parse(br#"echo "$(echo hi)""#),
-        pipes([cmd([
+    parse_test(
+        parse(br#""$(echo echo)""#),
+        pipes([cmd([str([cmdp(pipes([cmd([
+            estr(b"echo"),
             estr(b"echo"),
-            str([cmdp(pipes([cmd([estr(b"echo"), estr(b"hi")]),])),])
-        ]),])
-    );
+        ])]))])])]),
+    )
 }