add test coverage for new text PartialOrd impls

Author: dwrensha

capnp/tests/text_comparisons.rs

@@ -0,0 +1,22 @@
+#![cfg(feature = "alloc")]
+
+use capnp::{message, text};
+
+#[test]
+pub fn text_comparisons() {
+    let mut msg1 = message::Builder::new_default();
+    let mut msg2 = message::Builder::new_default();
+
+    msg1.set_root::<text::Reader>("abcde".into()).unwrap();
+    msg2.set_root::<text::Reader>("fghij".into()).unwrap();
+
+    let str1 = msg1.get_root_as_reader::<text::Reader>().unwrap();
+    let str2 = msg2.get_root_as_reader::<text::Reader>().unwrap();
+
+    assert!(str1 < str2);
+    assert!(str1 < "zzzz");
+    assert!("aaaa" < str2);
+    assert_eq!(str1, "abcde");
+    assert_eq!("fghij", str2);
+    assert_ne!(str1, str2);
+}