types.rs.html -- source
Description: Source to the Rust file `src\libtest\types.rs`.
Keywords: rust, rustlang, rust-lang

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    //! Common types used by `libtest`.

    use std::fmt;
    use std::borrow::Cow;

    use super::options;
    use super::bench::Bencher;

    pub use NamePadding::*;
    pub use TestName::*;
    pub use TestFn::*;

    /// Type of the test according to the [rust book](https://doc.rust-lang.org/cargo/guide/tests.html)
    /// conventions.
    #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
    pub enum TestType {
        /// Unit-tests are expected to be in the `src` folder of the crate.
        UnitTest,
        /// Integration-style tests are expected to be in the `tests` folder of the crate.
        IntegrationTest,
        /// Doctests are created by the `librustdoc` manually, so it's a different type of test.
        DocTest,
        /// Tests for the sources that don't follow the project layout convention
        /// (e.g. tests in raw `main.rs` compiled by calling `rustc --test` directly).
        Unknown,
    }

    #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
    pub enum NamePadding {
        PadNone,
        PadOnRight,
    }

    // The name of a test. By convention this follows the rules for rust
    // paths; i.e., it should be a series of identifiers separated by double
    // colons. This way if some test runner wants to arrange the tests
    // hierarchically it may.
    #[derive(Clone, PartialEq, Eq, Hash, Debug)]
    pub enum TestName {
        StaticTestName(&'static str),
        DynTestName(String),
        AlignedTestName(Cow<'static, str>, NamePadding),
    }

    impl TestName {
        pub fn as_slice(&self) -> &str {
            match *self {
                StaticTestName(s) => s,
                DynTestName(ref s) => s,
                AlignedTestName(ref s, _) => &*s,
            }
        }

        pub fn padding(&self) -> NamePadding {
            match self {
                &AlignedTestName(_, p) => p,
                _ => PadNone,
            }
        }

        pub fn with_padding(&self, padding: NamePadding) -> TestName {
            let name = match self {
                &TestName::StaticTestName(name) => Cow::Borrowed(name),
                &TestName::DynTestName(ref name) => Cow::Owned(name.clone()),
                &TestName::AlignedTestName(ref name, _) => name.clone(),
            };

            TestName::AlignedTestName(name, padding)
        }
    }
    impl fmt::Display for TestName {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            fmt::Display::fmt(self.as_slice(), f)
        }
    }

    /// Represents a benchmark function.
    pub trait TDynBenchFn: Send {
        fn run(&self, harness: &mut Bencher);
    }

    // A function that runs a test. If the function returns successfully,
    // the test succeeds; if the function panics then the test fails. We
    // may need to come up with a more clever definition of test in order
    // to support isolation of tests into threads.
    pub enum TestFn {
        StaticTestFn(fn()),
        StaticBenchFn(fn(&mut Bencher)),
        DynTestFn(Box<dyn FnOnce() + Send>),
        DynBenchFn(Box<dyn TDynBenchFn + 'static>),
    }

    impl TestFn {
        pub fn padding(&self) -> NamePadding {
            match *self {
                StaticTestFn(..) => PadNone,
                StaticBenchFn(..) => PadOnRight,
                DynTestFn(..) => PadNone,
                DynBenchFn(..) => PadOnRight,
            }
        }
    }

    impl fmt::Debug for TestFn {
        fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
            f.write_str(match *self {
                StaticTestFn(..) => "StaticTestFn(..)",
                StaticBenchFn(..) => "StaticBenchFn(..)",
                DynTestFn(..) => "DynTestFn(..)",
                DynBenchFn(..) => "DynBenchFn(..)",
            })
        }
    }

    // The definition of a single test. A test runner will run a list of
    // these.
    #[derive(Clone, Debug, PartialEq, Eq, Hash)]
    pub struct TestDesc {
        pub name: TestName,
        pub ignore: bool,
        pub should_panic: options::ShouldPanic,
        pub allow_fail: bool,
        pub test_type: TestType,
    }

    impl TestDesc {
        pub fn padded_name(&self, column_count: usize, align: NamePadding) -> String {
            let mut name = String::from(self.name.as_slice());
            let fill = column_count.saturating_sub(name.len());
            let pad = " ".repeat(fill);
            match align {
                PadNone => name,
                PadOnRight => {
                    name.push_str(&pad);
                    name
                }
            }
        }
    }

    #[derive(Debug)]
    pub struct TestDescAndFn {
        pub desc: TestDesc,
        pub testfn: TestFn,
    }