Add and test error if packet payload is too large

[m17rt] / m17app / src / test_util.rs

diff --git a/m17app/src/test_util.rs b/m17app/src/test_util.rs
new file mode 100644 (file)
index 0000000..ea654f1
--- /dev/null
+++ b/m17app/src/test_util.rs
@@ -0,0 +1,36 @@
+use std::io::{Read, Write};
+
+use crate::tnc::Tnc;
+
+#[derive(Clone)]
+pub(crate) struct NullTnc;
+
+impl Tnc for NullTnc {
+    fn try_clone(&mut self) -> Result<Self, crate::tnc::TncError> {
+        Ok(self.clone())
+    }
+
+    fn start(&mut self) -> Result<(), crate::tnc::TncError> {
+        Ok(())
+    }
+
+    fn close(&mut self) -> Result<(), crate::tnc::TncError> {
+        Ok(())
+    }
+}
+
+impl Write for NullTnc {
+    fn write(&mut self, _buf: &[u8]) -> std::io::Result<usize> {
+        Ok(0)
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        Ok(())
+    }
+}
+
+impl Read for NullTnc {
+    fn read(&mut self, _buf: &mut [u8]) -> std::io::Result<usize> {
+        Ok(0)
+    }
+}