boats_display_derive.rs

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// The following code is from https://github.com/withoutboats/display_derive/blob/232a32ee19e262aacbd2c93be5b4ce9e89a5fc30/tests/tests.rs

// Written by without boats originally

use derive_more::Display;

#[derive(Display)]

#[display("An error has occurred.")]

struct UnitError;

#[test]

fn unit_struct() {

    let s = UnitError.to_string();

    assert_eq!(s, "An error has occurred.");

#[derive(Display)]

#[display("Error code: {}", code)]

struct RecordError {

    code: u32,

#[test]

fn record_struct() {

    let s = RecordError { code: 0 }.to_string();

    assert_eq!(s, "Error code: 0");

#[derive(Display)]

#[display("Error code: {}", _0)]

struct TupleError(i32);

#[test]

fn tuple_struct() {

    let s = TupleError(2).to_string();

    assert_eq!(s, "Error code: 2");

#[derive(Display)]

enum EnumError {

    #[display("Error code: {}", code)]

    StructVariant { code: i32 },

    #[display("Error: {}", _0)]

    TupleVariant(&'static str),

    #[display("An error has occurred.")]

    UnitVariant,

#[test]

fn enum_error() {

    let s = EnumError::StructVariant { code: 2 }.to_string();

    assert_eq!(s, "Error code: 2");

    let s = EnumError::TupleVariant("foobar").to_string();

    assert_eq!(s, "Error: foobar");

    let s = EnumError::UnitVariant.to_string();

    assert_eq!(s, "An error has occurred.");