Add tests for heapless::String

Signed-off-by: chrysn <[email protected]>

minicbor-tests/Cargo.toml

@@ -11,9 +11,11 @@ description = "minicbor test suite"
 alloc  = ["minicbor/alloc"]
 std    = ["alloc", "minicbor/std", "minicbor/derive"]
 derive = ["alloc", "minicbor/derive"]
+heapless = ["dep:heapless", "minicbor/heapless"]
 
 [dependencies]
 arbitrary = { version = "1.3.2", features = ["derive"] }
+heapless = { version = "0.8.0", default-features = false, optional = true }
 minicbor  = { path = "../minicbor", features = ["half"] }
 
 [dev-dependencies]

minicbor-tests/tests/encoding.rs

@@ -259,3 +259,11 @@ fn regular_enum() {
     assert!(d.skip().unwrap_err().is_end_of_input())
 }
 
+#[cfg(feature = "heapless")]
+#[test]
+fn heapless() {
+    let original = heapless::String::<20>::try_from("BOR").unwrap();
+    let bytes = minicbor::to_vec(&original).unwrap();
+    assert_eq!(&b"cBOR"[..], &bytes[..]);
+    assert_eq!(original, minicbor::decode::<heapless::String::<20>>(&bytes).unwrap());
+}