exceptions: add test coverage for all exceptions

src/exceptions.rs

@@ -19,6 +19,7 @@ use std::os::raw::c_char;
 macro_rules! impl_exception_boilerplate {
     ($name: ident) => {
         impl ::std::convert::From<&$name> for $crate::PyErr {
+            #[inline]
             fn from(err: &$name) -> $crate::PyErr {
                 $crate::PyErr::from_instance(err)
             }
@@ -28,6 +29,7 @@ macro_rules! impl_exception_boilerplate {
             /// Creates a new [`PyErr`] of this type.
             ///
             /// [`PyErr`]: https://docs.rs/pyo3/latest/pyo3/struct.PyErr.html "PyErr in pyo3"
+            #[inline]
             pub fn new_err<A>(args: A) -> $crate::PyErr
             where
                 A: $crate::PyErrArguments + ::std::marker::Send + ::std::marker::Sync + 'static,
@@ -268,20 +270,20 @@ except ", $name, " as e:
 ```
 
 # Example: Catching ", $name, " in Rust
-        
+
 ```
 use pyo3::prelude::*;
 use pyo3::exceptions::Py", $name, ";
-        
+
 Python::with_gil(|py| {
     let result: PyResult<()> = py.run(\"raise ", $name, "\", None, None);
-        
+
     let error_type = match result {
         Ok(_) => \"Not an error\",
         Err(error) if error.is_instance::<Py", $name, ">(py) => \"" , $name, "\",
         Err(_) => \"Some other error\",
     };
-        
+
     assert_eq!(error_type, \"", $name, "\");
 });
 ```
@@ -578,6 +580,38 @@ impl PyUnicodeDecodeError {
     }
 }
 
+#[cfg(test)]
+macro_rules! test_exception {
+    ($exc_ty:ident $(, $constructor:expr)?) => {
+        #[allow(non_snake_case)]
+        #[test]
+        fn $exc_ty () {
+            use super::$exc_ty;
+
+            $crate::Python::with_gil(|py| {
+                use std::error::Error;
+                let err: $crate::PyErr = {
+                    None
+                    $(
+                        .or(Some($constructor(py)))
+                    )?
+                        .unwrap_or($exc_ty::new_err("a test exception"))
+                };
+
+                assert!(err.is_instance::<$exc_ty>(py));
+
+                let value: &$exc_ty = err.instance(py).downcast().unwrap();
+                assert!(value.source().is_none());
+
+                err.set_cause(py, Some($crate::exceptions::PyValueError::new_err("a cause")));
+                assert!(value.source().is_some());
+
+                assert!($crate::PyErr::from(value).is_instance::<$exc_ty>(py));
+            })
+        }
+    };
+}
+
 /// Exceptions defined in Python's [`asyncio`](https://docs.python.org/3/library/asyncio.html)
 /// module.
 pub mod asyncio {
@@ -588,6 +622,21 @@ pub mod asyncio {
     import_exception!(asyncio, LimitOverrunError);
     import_exception!(asyncio, QueueEmpty);
     import_exception!(asyncio, QueueFull);
+
+    #[cfg(test)]
+    mod tests {
+        test_exception!(CancelledError);
+        test_exception!(InvalidStateError);
+        test_exception!(TimeoutError);
+        test_exception!(IncompleteReadError, |_| {
+            IncompleteReadError::new_err(("partial", "expected"))
+        });
+        test_exception!(LimitOverrunError, |_| {
+            LimitOverrunError::new_err(("message", "consumed"))
+        });
+        test_exception!(QueueEmpty);
+        test_exception!(QueueFull);
+    }
 }
 
 /// Exceptions defined in Python's [`socket`](https://docs.python.org/3/library/socket.html)
@@ -596,11 +645,18 @@ pub mod socket {
     import_exception!(socket, herror);
     import_exception!(socket, gaierror);
     import_exception!(socket, timeout);
+
+    #[cfg(test)]
+    mod tests {
+        test_exception!(herror);
+        test_exception!(gaierror);
+        test_exception!(timeout);
+    }
 }
 
 #[cfg(test)]
 mod tests {
-    use super::{PyException, PyUnicodeDecodeError};
+    use super::*;
     use crate::types::{IntoPyDict, PyDict};
     use crate::{PyErr, Python};
 
@@ -765,4 +821,69 @@ mod tests {
             );
         });
     }
+
+    test_exception!(PyBaseException);
+    test_exception!(PyException);
+    test_exception!(PyStopAsyncIteration);
+    test_exception!(PyStopIteration);
+    test_exception!(PyGeneratorExit);
+    test_exception!(PyArithmeticError);
+    test_exception!(PyLookupError);
+    test_exception!(PyAssertionError);
+    test_exception!(PyAttributeError);
+    test_exception!(PyBufferError);
+    test_exception!(PyEOFError);
+    test_exception!(PyFloatingPointError);
+    test_exception!(PyOSError);
+    test_exception!(PyImportError);
+    test_exception!(PyModuleNotFoundError);
+    test_exception!(PyIndexError);
+    test_exception!(PyKeyError);
+    test_exception!(PyKeyboardInterrupt);
+    test_exception!(PyMemoryError);
+    test_exception!(PyNameError);
+    test_exception!(PyOverflowError);
+    test_exception!(PyRuntimeError);
+    test_exception!(PyRecursionError);
+    test_exception!(PyNotImplementedError);
+    test_exception!(PySyntaxError);
+    test_exception!(PyReferenceError);
+    test_exception!(PySystemError);
+    test_exception!(PySystemExit);
+    test_exception!(PyTypeError);
+    test_exception!(PyUnboundLocalError);
+    test_exception!(PyUnicodeError);
+    test_exception!(PyUnicodeDecodeError, |py| {
+        let invalid_utf8 = b"fo\xd8o";
+        let err = std::str::from_utf8(invalid_utf8).expect_err("should be invalid utf8");
+        PyErr::from_instance(PyUnicodeDecodeError::new_utf8(py, invalid_utf8, err).unwrap())
+    });
+    test_exception!(PyUnicodeEncodeError, |py: Python<'_>| {
+        py.eval("chr(40960).encode('ascii')", None, None)
+            .unwrap_err()
+    });
+    test_exception!(PyUnicodeTranslateError, |_| {
+        PyUnicodeTranslateError::new_err(("\u{3042}", 0, 1, "ouch"))
+    });
+    test_exception!(PyValueError);
+    test_exception!(PyZeroDivisionError);
+    test_exception!(PyBlockingIOError);
+    test_exception!(PyBrokenPipeError);
+    test_exception!(PyChildProcessError);
+    test_exception!(PyConnectionError);
+    test_exception!(PyConnectionAbortedError);
+    test_exception!(PyConnectionRefusedError);
+    test_exception!(PyConnectionResetError);
+    test_exception!(PyFileExistsError);
+    test_exception!(PyFileNotFoundError);
+    test_exception!(PyInterruptedError);
+    test_exception!(PyIsADirectoryError);
+    test_exception!(PyNotADirectoryError);
+    test_exception!(PyPermissionError);
+    test_exception!(PyProcessLookupError);
+    test_exception!(PyTimeoutError);
+    test_exception!(PyEnvironmentError);
+    test_exception!(PyIOError);
+    #[cfg(windows)]
+    test_exception!(PyWindowsError);
 }

src/types/mod.rs

@@ -41,7 +41,7 @@ macro_rules! pyobject_native_type_base(
             fn fmt(&self, f: &mut ::std::fmt::Formatter)
                    -> ::std::result::Result<(), ::std::fmt::Error>
             {
-                let s = self.repr().map_err(|_| ::std::fmt::Error)?;
+                let s = self.repr().or(::std::result::Result::Err(::std::fmt::Error))?;
                 f.write_str(&s.to_string_lossy())
             }
         }
@@ -50,7 +50,7 @@ macro_rules! pyobject_native_type_base(
             fn fmt(&self, f: &mut ::std::fmt::Formatter)
                    -> ::std::result::Result<(), ::std::fmt::Error>
             {
-                let s = self.str().map_err(|_| ::std::fmt::Error)?;
+                let s = self.str().or(::std::result::Result::Err(::std::fmt::Error))?;
                 f.write_str(&s.to_string_lossy())
             }
         }