Set width=-1 on libyaml emitter

src/libyaml/emitter.rs

@@ -70,6 +70,7 @@ impl<'a> Emitter<'a> {
                 panic!("malloc error: {}", libyaml::Error::emit_error(emitter));
             }
             sys::yaml_emitter_set_unicode(emitter, true);
+            sys::yaml_emitter_set_width(emitter, -1);
             addr_of_mut!((*owned.ptr).write).write(write);
             addr_of_mut!((*owned.ptr).write_error).write(None);
             sys::yaml_emitter_set_output(emitter, write_handler, owned.ptr.cast());

tests/test_serde.rs

@@ -11,6 +11,7 @@ use serde_derive::{Deserialize, Serialize};
 use serde_yaml::{Mapping, Number, Value};
 use std::collections::BTreeMap;
 use std::fmt::Debug;
+use std::iter;
 
 fn test_serde<T>(thing: &T, yaml: &str)
 where
@@ -528,3 +529,21 @@ fn test_mapping() {
 
     test_serde(&thing, yaml);
 }
+
+#[test]
+fn test_long_string() {
+    #[derive(Serialize, Deserialize, PartialEq, Debug)]
+    struct Data {
+        pub string: String,
+    }
+
+    let thing = Data {
+        string: iter::repeat(["word", " "]).flatten().take(69).collect(),
+    };
+
+    let yaml = indoc! {"
+        string: word word word word word word word word word word word word word word word word word word word word word word word word word word word word word word word word word word word
+    "};
+
+    test_serde(&thing, yaml);
+}