Execute(The Rust handler should handle rustc output):
  call ale#test#SetFilename('src/playpen.rs')

  AssertEqual
  \ [
  \   {
  \     'lnum': 15,
  \     'end_lnum': 15,
  \     'type': 'E',
  \     'col': 418,
  \     'end_col': 421,
  \     'text': 'expected one of `.`, `;`, `?`, `}`, or an operator, found `for`',
  \   },
  \   {
  \      'lnum': 13,
  \      'end_lnum': 13,
  \      'type': 'E',
  \      'col': 407,
  \      'end_col': 410,
  \      'text': 'no method named `wat` found for type `std::string::String` in the current scope',
  \   },
  \ ],
  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/playpen.rs', [
  \   '',
  \   'ignore this',
  \   '{"message":"expected one of `.`, `;`, `?`, `}`, or an operator, found `for`","code":null,"level":"error","spans":[{"file_name":"<anon>","byte_start":418,"byte_end":421,"line_start":15,"line_end":15,"column_start":5,"column_end":8,"is_primary":true,"text":[{"text":"    for chr in source.trim().chars() {","highlight_start":5,"highlight_end":8}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[],"rendered":null}',
  \   '{"message":"main function not found","code":null,"level":"error","spans":[],"children":[],"rendered":null}',
  \   '{"message":"no method named `wat` found for type `std::string::String` in the current scope","code":null,"level":"error","spans":[{"file_name":"<anon>","byte_start":407,"byte_end":410,"line_start":13,"line_end":13,"column_start":7,"column_end":10,"is_primary":true,"text":[{"text":"    s.wat()","highlight_start":7,"highlight_end":10}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[],"rendered":null}',
  \   '{"message":"aborting due to previous error","code":null,"level":"error","spans":[],"children":[],"rendered":null}',
  \ ])

Execute(The Rust handler should handle cargo output):
  call ale#test#SetFilename('src/playpen.rs')

  AssertEqual
  \ [
  \   {
  \     'lnum': 15,
  \     'end_lnum': 15,
  \     'type': 'E',
  \     'col': 11505,
  \     'end_col': 11508,
  \     'text': 'expected one of `.`, `;`, `?`, `}`, or an operator, found `for`',
  \   },
  \   {
  \     'lnum': 13,
  \     'end_lnum': 13,
  \     'type': 'E',
  \     'col': 11494,
  \     'end_col': 11497,
  \     'text': 'no method named `wat` found for type `std::string::String` in the current scope',
  \   },
  \ ],
  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/playpen.rs', [
  \   '',
  \   'ignore this',
  \   '{"message":{"children":[],"code":null,"level":"error","message":"expected one of `.`, `;`, `?`, `}`, or an operator, found `for`","rendered":null,"spans":[{"byte_end":11508,"byte_start":11505,"column_end":8,"column_start":5,"expansion":null,"file_name":"src/playpen.rs","is_primary":true,"label":null,"line_end":15,"line_start":15,"suggested_replacement":null,"text":[{"highlight_end":8,"highlight_start":5,"text":"    for chr in source.trim().chars() {"}]}]},"package_id":"update 0.0.1 (path+file:///home/w0rp/Downloads/rust-by-example)","reason":"compiler-message","target":{"kind":["bin"],"name":"update","src_path":"/home/w0rp/Downloads/rust-by-example/src/main.rs"}}',
  \   '{"message":{"children":[],"code":null,"level":"error","message":"no method named `wat` found for type `std::string::String` in the current scope","rendered":null,"spans":[{"byte_end":11497,"byte_start":11494,"column_end":10,"column_start":7,"expansion":null,"file_name":"src/playpen.rs","is_primary":true,"label":null,"line_end":13,"line_start":13,"suggested_replacement":null,"text":[{"highlight_end":10,"highlight_start":7,"text":"    s.wat()"}]}]},"package_id":"update 0.0.1 (path+file:///home/w0rp/Downloads/rust-by-example)","reason":"compiler-message","target":{"kind":["bin"],"name":"update","src_path":"/home/w0rp/Downloads/rust-by-example/src/main.rs"}}',
  \   '{"message":{"children":[],"code":null,"level":"error","message":"aborting due to previous error","rendered":null,"spans":[]},"package_id":"update 0.0.1 (path+file:///home/w0rp/Downloads/rust-by-example)","reason":"compiler-message","target":{"kind":["bin"],"name":"update","src_path":"/home/w0rp/Downloads/rust-by-example/src/main.rs"}}',
  \ ])

" Execute(The Rust handler should handle cargo output on Windows):
"   call ale#test#SetFilename('src\nvim.rs')
" 
"   AssertEqual
"   \ [
"   \   {
"   \     'lnum': 467,
"   \     'end_lnum': 467,
"   \     'type': 'E',
"   \     'col': 43198,
"   \     'end_col': 43199,
"   \     'text': 'expected one of `!` or `::`, found `#`: unexpected token',
"   \   },
"   \ ],
"   \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src\nvim.rs', [
"   \   '{"message":{"children":[],"code":null,"level":"error","message":"expected one of `!` or `::`, found `#`","rendered":null,"spans":[{"byte_end":43199,"byte_start":43198,"column_end":2,"column_start":1,"expansion":null,"file_name":"src\\nvim.rs","is_primary":true,"label":"unexpected token","line_end":467,"line_start":467,"suggested_replacement":null,"text":[{"highlight_end":2,"highlight_start":1,"text":"#[cfg(test)]\r"}]}]},"package_id":"nvim-gtk 0.1.2 (path+file:///E:/daa/local/neovim-gtk)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"nvim-gtk","src_path":"E:\\daa\\local\\neovim-gtk\\src\\main.rs"}}',
"   \ ])

Execute(The Rust handler should show detailed errors):
  call ale#test#SetFilename('src/playpen.rs')

  AssertEqual
  \ [
  \   {
  \     'lnum': 4,
  \     'end_lnum': 4,
  \     'type': 'E',
  \     'col': 52,
  \     'end_col': 54,
  \     'text': 'mismatched types: expected bool, found integral variable',
  \   },
  \ ],
  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/playpen.rs', [
  \   '',
  \   'ignore this',
  \   '{"message":{"children":[],"code":null,"level":"error","message":"mismatched types","rendered":null,"spans":[{"byte_end":54,"byte_start":52,"column_end":23,"column_start":21,"expansion":null,"file_name":"src/playpen.rs","is_primary":true,"label":"expected bool, found integral variable","line_end":4,"line_start":4,"suggested_replacement":null,"text":[{"highlight_end":23,"highlight_start":21,"text":"    let foo: bool = 42;"}]}]},"package_id":"ale-rust-details 0.1.1 (path+file:///home/jon/tmp/ale-rust-details)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"ale-rust-details","src_path":"/home/jon/tmp/ale-rust-details/src/main.rs"}}',
  \   '{"message":{"children":[],"code":null,"level":"error","message":"aborting due to previous error(s)","rendered":null,"spans":[]},"package_id":"ale-rust-details 0.1.1 (path+file:///home/jon/tmp/ale-rust-details)","reason":"compiler-message","target":{"crate_types":["bin"],"kind":["bin"],"name":"ale-rust-details","src_path":"/home/jon/tmp/ale-rust-details/src/main.rs"}}',
  \ ])

Execute(The Rust handler should find correct files):
  call ale#test#SetFilename('src/noerrors/mod.rs')

  AssertEqual
  \ [],
  \ ale#handlers#rust#HandleRustErrorsForFile(bufnr(''), 'src/noerrors/mod.rs', [
  \   '',
  \   'ignore this',
  \   '{"message":{"children":[],"code":null,"level":"error","message":"unresolved import `Undefined`","rendered":null,"spans":[{"byte_end":103,"byte_start":94,"column_end":14,"column_start":5,"expansion":null,"file_name":"src/haserrors/mod.rs","is_primary":true,"label":"no `Undefined` in the root","line_end":1,"line_start":1,"suggested_replacement":null,"text":[{"highlight_end":14,"highlight_start":5,"text":"use Undefined;"}]}]},"package_id":"sample 0.1.0 (path+file:///private/tmp/sample)","reason":"compiler-message","target":{"crate_types":["lib"],"kind":["lib"],"name":"sample","src_path":"/private/tmp/sample/src/lib.rs"}}',
  \   '{"message":{"children":[],"code":null,"level":"error","message":"aborting due to previous error","rendered":null,"spans":[]},"package_id":"sample 0.1.0 (path+file:///private/tmp/sample)","reason":"compiler-message","target":{"crate_types":["lib"],"kind":["lib"],"name":"sample","src_path":"/private/tmp/sample/src/lib.rs"}}',
  \ ])