Fully expand error messages in tests

1 files changed, 14 insertions, 2 deletions

diff --git a/test-suite/tests/backcompat.rs b/test-suite/tests/backcompat.rs
index 53cda69..45198f0 100644
--- a/test-suite/tests/backcompat.rs
+++ b/test-suite/tests/backcompat.rs
@@ -3,13 +3,22 @@ extern crate toml;
 
 use serde::de::Deserialize;
 
+macro_rules! bad {
+    ($toml:expr, $msg:expr) => {
+        match $toml.parse::<toml::Value>() {
+            Ok(s) => panic!("parsed to: {:#?}", s),
+            Err(e) => assert_eq!(e.to_string(), $msg),
+        }
+    };
+}
+
 #[test]
 fn newlines_after_tables() {
     let s = "
         [a] foo = 1
         [[b]] foo = 1
     ";
-    assert!(s.parse::<toml::Value>().is_err());
+    bad!(s, "expected newline, found an identifier at line 2");
 
     let mut d = toml::de::Deserializer::new(s);
     d.set_require_newline_after_table(false);
@@ -30,7 +39,10 @@ fn allow_duplicate_after_longer() {
         [dependencies]
         bitflags = 1
     ";
-    assert!(s.parse::<toml::Value>().is_err());
+    bad!(
+        s,
+        "redefinition of table `dependencies` for key `dependencies` at line 8"
+    );
 
     let mut d = toml::de::Deserializer::new(s);
     d.set_allow_duplicate_after_longer_table(true);