add ui tests (inspired by trybuild)

1 files changed, 35 insertions, 0 deletions

diff --git a/src/lib.rs b/src/lib.rs
index c0286f8..fc81e42 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -448,3 +448,38 @@ fn path_segment_for_trait(sometrait: &ItemTrait) -> PathSegment {
 #[doc = include_str!("../tests/doctests.md")]
 #[cfg(doctest)]
 struct Doctests;
+
+#[test]
+fn ui() {
+    use std::process::Command;
+
+    for entry in std::fs::read_dir("ui-tests/src/bin").unwrap().flatten() {
+        if entry.path().extension().unwrap() == "rs" {
+            let output = Command::new("cargo")
+                .arg("check")
+                .arg("--quiet")
+                .arg("--bin")
+                .arg(entry.path().file_stem().unwrap())
+                .current_dir("ui-tests")
+                .output()
+                .unwrap();
+            let received_stderr = std::str::from_utf8(&output.stderr)
+                .unwrap()
+                .lines()
+                .filter(|l| !l.starts_with("error: could not compile"))
+                .collect::<Vec<_>>()
+                .join("\n");
+            let expected_stderr =
+                std::fs::read_to_string(entry.path().with_extension("stderr")).unwrap_or_default();
+            if received_stderr != expected_stderr {
+                println!(
+                    "EXPECTED:\n{banner}\n{expected}{banner}\n\nACTUAL OUTPUT:\n{banner}\n{actual}{banner}",
+                    banner = "-".repeat(30),
+                    expected = expected_stderr,
+                    actual = received_stderr
+                );
+                panic!("failed");
+            }
+        }
+    }
+}