Draft Instruction DSL in iced_test

test/src/error.rs

@@ -0,0 +1,39 @@
+use crate::Selector;
+
+use std::io;
+use std::sync::Arc;
+
+/// A test error.
+#[derive(Debug, Clone, thiserror::Error)]
+pub enum Error {
+    /// No matching widget was found for the [`Selector`].
+    #[error("no matching widget was found for the selector: {0:?}")]
+    NotFound(Selector),
+    /// An IO operation failed.
+    #[error("an IO operation failed: {0}")]
+    IOFailed(Arc<io::Error>),
+    /// The decoding of some PNG image failed.
+    #[error("the decoding of some PNG image failed: {0}")]
+    PngDecodingFailed(Arc<png::DecodingError>),
+    /// The encoding of some PNG image failed.
+    #[error("the encoding of some PNG image failed: {0}")]
+    PngEncodingFailed(Arc<png::EncodingError>),
+}
+
+impl From<io::Error> for Error {
+    fn from(error: io::Error) -> Self {
+        Self::IOFailed(Arc::new(error))
+    }
+}
+
+impl From<png::DecodingError> for Error {
+    fn from(error: png::DecodingError) -> Self {
+        Self::PngDecodingFailed(Arc::new(error))
+    }
+}
+
+impl From<png::EncodingError> for Error {
+    fn from(error: png::EncodingError) -> Self {
+        Self::PngEncodingFailed(Arc::new(error))
+    }
+}