From 56e43956cdb1d13918cd6b91e70f61cf5379b579 Mon Sep 17 00:00:00 2001 From: DongHun Kwak Date: Fri, 10 Nov 2023 10:25:51 +0900 Subject: [PATCH 1/1] Import mockall_double 0.3.0 --- .cargo_vcs_info.json | 6 + CHANGELOG.md | 12 ++ Cargo.toml | 48 ++++++ Cargo.toml.orig | 25 ++++ LICENSE-APACHE | 201 +++++++++++++++++++++++++ LICENSE-MIT | 25 ++++ README.md | 90 +++++++++++ src/lib.rs | 349 +++++++++++++++++++++++++++++++++++++++++++ 8 files changed, 756 insertions(+) create mode 100644 .cargo_vcs_info.json create mode 100644 CHANGELOG.md create mode 100644 Cargo.toml create mode 100644 Cargo.toml.orig create mode 100644 LICENSE-APACHE create mode 100644 LICENSE-MIT create mode 100644 README.md create mode 100644 src/lib.rs diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json new file mode 100644 index 0000000..d6b850e --- /dev/null +++ b/.cargo_vcs_info.json @@ -0,0 +1,6 @@ +{ + "git": { + "sha1": "468738e5f0f8b8ddb67fd693dbc4d748412bf848" + }, + "path_in_vcs": "mockall_double" +} \ No newline at end of file diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 index 0000000..80b4801 --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,12 @@ +# Change Log + +All notable changes to this project will be documented in this file. +This project adheres to [Semantic Versioning](http://semver.org/). + + +## [ Unreleased ] - ReleaseDate + +### Added + +- Added the ability to mock type aliases. + ([#374](https://github.com/asomers/mockall/pull/374)) diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..d922473 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,48 @@ +# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO +# +# When uploading crates to the registry Cargo will automatically +# "normalize" Cargo.toml files for maximal compatibility +# with all versions of Cargo and also rewrite `path` dependencies +# to registry (e.g., crates.io) dependencies. +# +# If you are reading this file be aware that the original Cargo.toml +# will likely look very different (and much more reasonable). +# See Cargo.toml.orig for the original contents. + +[package] +edition = "2018" +name = "mockall_double" +version = "0.3.0" +authors = ["Alan Somers "] +description = """ +Test double adapter for Mockall +""" +documentation = "https://docs.rs/mockall_double" +readme = "README.md" +keywords = [ + "mock", + "mocking", + "testing", +] +categories = ["development-tools::testing"] +license = "MIT/Apache-2.0" +repository = "https://github.com/asomers/mockall" + +[lib] +proc-macro = true + +[dependencies.cfg-if] +version = "1.0" + +[dependencies.proc-macro2] +version = "1.0" + +[dependencies.quote] +version = "1.0" + +[dependencies.syn] +version = "1.0.15" +features = ["full"] + +[features] +nightly = ["proc-macro2/nightly"] diff --git a/Cargo.toml.orig b/Cargo.toml.orig new file mode 100644 index 0000000..389f2a8 --- /dev/null +++ b/Cargo.toml.orig @@ -0,0 +1,25 @@ +[package] +name = "mockall_double" +version = "0.3.0" +authors = ["Alan Somers "] +license = "MIT/Apache-2.0" +repository = "https://github.com/asomers/mockall" +categories = ["development-tools::testing"] +keywords = ["mock", "mocking", "testing"] +documentation = "https://docs.rs/mockall_double" +edition = "2018" +description = """ +Test double adapter for Mockall +""" + +[lib] +proc-macro = true + +[features] +nightly = ["proc-macro2/nightly"] + +[dependencies] +cfg-if = "1.0" +proc-macro2 = "1.0" +quote = "1.0" +syn = { version = "1.0.15", features = ["full"] } diff --git a/LICENSE-APACHE b/LICENSE-APACHE new file mode 100644 index 0000000..16fe87b --- /dev/null +++ b/LICENSE-APACHE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + +TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + +1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + +Copyright [yyyy] [name of copyright owner] + +Licensed under the Apache License, Version 2.0 (the "License"); +you may not use this file except in compliance with the License. +You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + +Unless required by applicable law or agreed to in writing, software +distributed under the License is distributed on an "AS IS" BASIS, +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +See the License for the specific language governing permissions and +limitations under the License. diff --git a/LICENSE-MIT b/LICENSE-MIT new file mode 100644 index 0000000..39df3da --- /dev/null +++ b/LICENSE-MIT @@ -0,0 +1,25 @@ +Copyright (c) 2019 Alan Somers + +Permission is hereby granted, free of charge, to any +person obtaining a copy of this software and associated +documentation files (the "Software"), to deal in the +Software without restriction, including without +limitation the rights to use, copy, modify, merge, +publish, distribute, sublicense, and/or sell copies of +the Software, and to permit persons to whom the Software +is furnished to do so, subject to the following +conditions: + +The above copyright notice and this permission notice +shall be included in all copies or substantial portions +of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF +ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED +TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A +PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT +SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY +CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR +IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..dcccd1e --- /dev/null +++ b/README.md @@ -0,0 +1,90 @@ +# mockall_double + +A double test adapter that works well with Mockall. + +[![Build Status](https://api.cirrus-ci.com/github/asomers/mockall.svg)](https://cirrus-ci.com/github/asomers/mockall) +[![Crates.io](https://img.shields.io/crates/v/mockall_double.svg)](https://crates.io/crates/mockall_double) +[![Documentation](https://docs.rs/mockall_double/badge.svg)](https://docs.rs/mockall_double) + +## Overview + +Mockall can easily create a mock version of a struct. But how does one +convince the code under test to use the mock struct instead of the real one? +In Rust, it's necessary to replace the real struct at compile time. That's +very easy to do with a few `#[cfg(test)]` statements. But mockall_double makes +it even easier. + +## Usage + +Typically `mockall` is only used by unit tests, so it can be a dev-dependency. +But `mockall_double` must be a full dependency. To use it this way, add this to +your `Cargo.toml`: + +```toml +[dependencies] +mockall_double = "0.2.1" + +[dev-dependencies] +mockall = "0.11.0" +``` + +Then use it like this: + +```rust +use mockall_double::double; + +mod mockable { + #[cfg(test)] + use mockall::automock; + + pub struct Foo {} + #[cfg_attr(test, automock)] + impl Foo { + pub fn foo(&self, x: u32) -> u32 { + // ... + 0 + } + } +} + +#[double] +use mockable::Foo; + +fn bar(f: Foo) -> u32 { + f.foo(42) +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn bar_test() { + let mut mock = Foo::new(); + mock.expect_foo() + .returning(|x| x + 1); + assert_eq!(43, bar(mock)); + } +} +``` + +See the [API docs](https://docs.rs/mockall_double) for more information. + +# Minimum Supported Rust Version (MSRV) + +`mockall_double` is tested with the same MSRV as Mockall itself. Currently, +that's Rust 1.42.0. `mockall_double`'s MSRV will not be changed in the future +without bumping the major or minor version. + +# License + +`mockall_double` is primarily distributed under the terms of both the MIT +license and the Apache License (Version 2.0). + +See LICENSE-APACHE, and LICENSE-MIT for details + +# Acknowledgements + +`mockall_double` is inspired by Jason Grlicky's +[double](https://crates.io/crates/double) crate, but tweaked to work better +with Mockall's naming conventions. diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..c238772 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,349 @@ +// vim: tw=80 +//! Test double adapter for use with Mockall +//! +//! This crate provides [`#[double]`](macro@double), which can swap in Mock +//! objects for real objects while in test mode. It's intended to be used in +//! tandem with the [`mockall`](https://docs.rs/mockall/latest/mockall) crate. +//! However, it is defined in its own crate so that the bulk of Mockall can +//! remain a dev-dependency, instead of a regular dependency. + +#![cfg_attr(feature = "nightly", feature(proc_macro_diagnostic))] +#![cfg_attr(test, deny(warnings))] +extern crate proc_macro; + +use cfg_if::cfg_if; +use proc_macro2::{Span, TokenStream}; +use quote::{format_ident, quote}; +use syn::{ + *, + spanned::Spanned +}; + +cfg_if! { + // proc-macro2's Span::unstable method requires the nightly feature, and it + // doesn't work in test mode. + // https://github.com/alexcrichton/proc-macro2/issues/159 + if #[cfg(all(feature = "nightly", not(test)))] { + fn compile_error(span: Span, msg: &'static str) { + span.unstable() + .error(msg) + .emit(); + } + } else { + fn compile_error(_span: Span, msg: &str) { + panic!("{}. More information may be available when mockall_double is built with the \"nightly\" feature.", msg); + } + } +} + +fn do_double(_attrs: TokenStream, input: TokenStream) -> TokenStream { + let mut item: Item = match parse2(input.clone()) { + Ok(u) => u, + Err(e) => return e.to_compile_error() + }; + match &mut item { + Item::Use(use_stmt) => mock_itemuse(use_stmt), + Item::Type(item_type) => mock_itemtype(item_type), + _ => { + compile_error(item.span(), + "Only use statements and type aliases may be doubled"); + } + }; + quote!( + #[cfg(not(test))] + #input + #[cfg(test)] + #item + ) +} + +/// Import a mock type in test mode, or a real type otherwise. +/// +/// In a regular build, this macro is a no-op. But when `#[cfg(test)]`, it +/// substitutes "MockXXX" for any imported "XXX". This makes it easy to to use +/// mock objects, especially structs, in your unit tests. +/// +/// This macro uses the same naming convention as +/// [`mockall`](https://docs.rs/mockall/latest/mockall), but doesn't strictly +/// require it. It can work with hand-built Mock objects, or any other crate +/// using the same naming convention. +/// +/// This is the most common way to use `#[double]`. In order to replace a type, +/// it must come from a separate module. So to mock type `Foo`, place it into a +/// submodule, along with its mock counterpart. Then simply import `Foo` with +/// `#[double]` like this: +/// ```no_run +/// # use mockall_double::double; +/// mod foo { +/// pub(super) struct Foo { +/// // ... +/// } +/// #[cfg(test)] +/// pub(super) struct MockFoo { +/// // ... +/// } +/// } +/// #[double] +/// use foo::Foo; +/// ``` +/// That will expand to the following: +/// ```no_run +/// # use mockall_double::double; +/// # mod foo { pub struct Foo {} } +/// #[cfg(not(test))] +/// use foo::Foo; +/// #[cfg(test)] +/// use foo::MockFoo as Foo; +/// ``` +/// `#[double]` can handle deeply nested paths, +/// ```no_run +/// # use mockall_double::double; +/// # mod foo { pub mod bar { pub struct Baz{} } } +/// #[double] +/// use foo::bar::Baz; +/// ``` +/// grouped imports, +/// ```no_run +/// # mod foo { pub mod bar { pub struct Baz{} pub struct Bean {} } } +/// # use mockall_double::double; +/// #[double] +/// use foo::bar::{ +/// Baz, +/// Bean +/// }; +/// ``` +/// type aliases, +/// ```no_run +/// # mod bar { pub struct Baz {} } +/// # use mockall_double::double; +/// #[double] +/// type Foo = bar::Baz; +/// ``` +/// and renamed imports, too. With renamed imports, it isn't even necessary to +/// declare a submodule. +/// ```no_run +/// # use mockall_double::double; +/// # struct Foo {} +/// #[double] +/// use Foo as Bar; +/// ``` +/// Finally, `#[double]` can also import entire mocked modules, not just +/// structures. In this case the naming convention is different. It will +/// replace "xxx" with "mock_xxx". For example: +/// ```no_run +/// # use mockall_double::double; +/// mod foo { +/// pub mod inner { +/// // ... +/// } +/// pub mod mock_inner { +/// // ... +/// } +/// } +/// #[double] +/// use foo::inner; +/// ``` +/// will expand to: +/// ```no_run +/// # use mockall_double::double; +/// # mod foo { pub mod inner { } pub mod mock_inner { } } +/// #[cfg(not(test))] +/// use foo::inner; +/// #[cfg(test)] +/// use foo::mock_inner as inner; +/// ``` +/// +#[proc_macro_attribute] +pub fn double(attrs: proc_macro::TokenStream, input: proc_macro::TokenStream) + -> proc_macro::TokenStream +{ + do_double(attrs.into(), input.into()).into() +} + +fn mock_itemtype(orig: &mut ItemType) { + match &mut *orig.ty { + Type::Path(tp) => { + let ident = &tp.path.segments.last_mut().unwrap().ident; + tp.path.segments.last_mut().unwrap().ident = mock_ident(ident); + } + x => compile_error(x.span(), "Only path types may be doubled") + } +} + +fn mock_itemuse(orig: &mut ItemUse) { + if let UseTree::Name(un) = &orig.tree { + compile_error(un.span(), + "Cannot double types in the current module. Use a submodule (use foo::Foo) or a rename (use Foo as Bar)"); + } else { + mock_usetree(&mut orig.tree) + } +} + +fn mock_ident(i: &Ident) -> Ident { + let is_type = format!("{}", i) + .chars() + .next() + .expect("zero-length ident?") + .is_uppercase(); + if is_type { + // probably a Type + format_ident!("Mock{}", i) + } else { + // probably a module + format_ident!("mock_{}", i) + } +} + +fn mock_usetree(mut orig: &mut UseTree) { + match &mut orig { + UseTree::Glob(star) => { + compile_error(star.span(), + "Cannot double glob imports. Import by fully qualified name instead."); + }, + UseTree::Group(ug) => { + for ut in ug.items.iter_mut() { + mock_usetree(ut); + } + }, + UseTree::Name(un) => { + *orig = UseTree::Rename(UseRename { + ident: mock_ident(&un.ident), + as_token: ::default(), + rename: un.ident.clone() + }); + }, + UseTree::Path(up) => { + mock_usetree(up.tree.as_mut()); + }, + UseTree::Rename(ur) => { + ur.ident = mock_ident(&ur.ident) + }, + } +} + +#[cfg(test)] +mod t { + use super::*; + +mod double { + use super::*; + use std::str::FromStr; + + fn cmp(attrs: &str, code: &str, expected: &str) { + let attrs_ts = TokenStream::from_str(attrs).unwrap(); + let code_ts = TokenStream::from_str(code).unwrap(); + let output = do_double(attrs_ts, code_ts); + let output = output.to_string(); + // Round-trip expected through proc_macro2 so whitespace will be + // identically formatted + let expected = TokenStream::from_str(expected) + .unwrap() + .to_string(); + assert_eq!(output, expected); + } + + #[test] + #[should_panic(expected = "Cannot double glob")] + fn glob() { + let code = r#"use foo::*;"#; + cmp("", code, ""); + } + + #[test] + fn group() { + let code = r#" + use foo::bar::{ + Baz, + Bean + }; + "#; + let expected = r#" + #[cfg(not(test))] + use foo::bar::{ + Baz, + Bean + }; + #[cfg(test)] + use foo::bar::{ + MockBaz as Baz, + MockBean as Bean + }; + "#; + cmp("", code, expected); + } + + #[test] + fn module() { + let code = r#"use foo::bar;"#; + let expected = r#" + #[cfg(not(test))] + use foo::bar; + #[cfg(test)] + use foo::mock_bar as bar; + "#; + cmp("", code, expected); + } + + #[test] + #[should_panic(expected = "Cannot double types in the current module")] + fn name() { + let code = r#"use Foo;"#; + cmp("", code, ""); + } + + #[test] + fn path() { + let code = r#"use foo::bar::Baz;"#; + let expected = r#" + #[cfg(not(test))] + use foo::bar::Baz; + #[cfg(test)] + use foo::bar::MockBaz as Baz; + "#; + cmp("", code, expected); + } + + #[test] + fn pub_use() { + let code = r#"pub use foo::bar;"#; + let expected = r#" + #[cfg(not(test))] + pub use foo::bar; + #[cfg(test)] + pub use foo::mock_bar as bar; + "#; + cmp("", code, expected); + } + + #[test] + fn rename() { + let code = r#"use Foo as Bar;"#; + let expected = r#" + #[cfg(not(test))] + use Foo as Bar; + #[cfg(test)] + use MockFoo as Bar; + "#; + cmp("", code, expected); + } + + #[test] + fn type_() { + let code = r#"type Foo = bar::Baz;"#; + let expected = r#" + #[cfg(not(test))] + type Foo = bar::Baz; + #[cfg(test)] + type Foo = bar::MockBaz; + "#; + cmp("", code, expected); + } + + #[test] + #[should_panic(expected = "Only use statements and type aliases")] + fn undoubleable() { + let code = r#"struct Foo{}"#; + cmp("", code, ""); + } +} +} -- 2.34.1