add test_fmt_examples

Cargo.lock

@@ -3375,6 +3375,7 @@ dependencies = [
  "roc_parse",
  "roc_region",
  "roc_test_utils",
+ "walkdir",
 ]
 
 [[package]]

compiler/fmt/Cargo.toml

@@ -16,3 +16,4 @@ bumpalo = { version = "3.8.0", features = ["collections"] }
 pretty_assertions = "1.0.0"
 indoc = "1.0.3"
 roc_test_utils = { path = "../../test_utils" }
+walkdir = "2.3.2"

compiler/fmt/tests/test_fmt.rs

@@ -63,7 +63,6 @@ mod test_fmt {
                     }
                     Err(error) => panic!("Unexpected parse failure when parsing this for defs formatting:\n\n{:?}\n\nParse error was:\n\n{:?}\n\n", src, error)
                 }
-
                 assert_multiline_str_eq!(expected, buf.as_str())
             }
             Err(error) => panic!("Unexpected parse failure when parsing this for module header formatting:\n\n{:?}\n\nParse error was:\n\n{:?}\n\n", src, error)
@@ -71,8 +70,6 @@ mod test_fmt {
     }
 
     fn module_formats_to(input: &str, expected: &str) {
-        let input = input.trim_end();
-
         // First check that input formats to the expected version
         expect_format_module_helper(input, expected);
 
@@ -2941,6 +2938,35 @@ mod test_fmt {
         ));
     }
 
+    #[test]
+    /// Test that everything under examples/ is formatted correctly
+    fn test_fmt_examples() {
+        let mut count = 0;
+        let mut root = std::env::current_dir()
+            .unwrap()
+            .parent()
+            .unwrap()
+            .parent()
+            .unwrap()
+            .to_owned();
+        root.push("examples");
+        for entry in walkdir::WalkDir::new(&root) {
+            let entry = entry.unwrap();
+            let path = entry.path();
+            if path.extension() == Some(&std::ffi::OsStr::new("roc")) {
+                count += 1;
+                let src = std::fs::read_to_string(path).unwrap();
+                println!("{}", path.display());
+                module_formats_same(&src);
+            }
+        }
+        assert!(
+            count > 0,
+            "Expecting to find at least 1 .roc file to format under {}",
+            root.display()
+        );
+    }
+
     // this is a parse error atm
     //    #[test]
     //    fn multiline_apply() {