virtual_io

Struct VioFakeBuilder

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pub struct VioFakeBuilder { /* private fields */ }
Expand description

Create a new FakeVio to be used for testing.

The builder first lets you specify the expected IO messages, then lets you create the FakeVio.

use virtual_io::VirtualIo;

fn get_name_base(vio: &mut impl VirtualIo) -> String {
    vio.print("What is your name? ");
    let name = vio.read_line();
    vio.println(format!("Hello, {}!", name));
    name
}

#[cfg(test)]
mod test {
    use super::*;
    use virtual_io::VioFakeBuilder;

    #[test]
    fn test_get_name() {
        // Create a fake version of vio that we can inject into the base
        // function.
        let mut vio = VioFakeBuilder::new()
            // Add the expected io calls.
            .expect_stdout("What is your name? ")
            .provide_stdin("John")
            .expect_stdout("Hello, John!\n")
            // Build the fake vio.
            .build();
        // Assert that the return value is correct.
        assert_eq!(get_name_base(&mut vio), "John");
        // Assert that all io operations were identical to what was expected.
        assert_eq!(vio.get_actual(), vio.get_expected());
    }
}

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impl VioFakeBuilder

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pub const fn new() -> Self

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pub fn expect_stdout<S: Into<String>>(&mut self, message: S) -> &mut Self

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pub fn provide_stdin<S: Into<String>>(&mut self, message: S) -> &mut Self

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pub fn set_environment_var<S: Into<String>>( &mut self, name: S, value: S, ) -> &mut Self

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pub fn build(&self) -> VioFake

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impl Debug for VioFakeBuilder

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for VioFakeBuilder

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fn default() -> VioFakeBuilder

Returns the “default value” for a type. Read more
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impl PartialEq for VioFakeBuilder

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fn eq(&self, other: &VioFakeBuilder) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Eq for VioFakeBuilder

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impl StructuralPartialEq for VioFakeBuilder

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.