Struct zebra_test::prelude::prop::test_runner::TestRng
pub struct TestRng {
rng: TestRngImpl,
}Expand description
Proptest’s random number generator.
Fields§
§rng: TestRngImplImplementations§
§impl TestRng
impl TestRng
pub fn from_seed(algorithm: RngAlgorithm, seed: &[u8]) -> TestRng
pub fn from_seed(algorithm: RngAlgorithm, seed: &[u8]) -> TestRng
Create a new RNG with the given algorithm and seed.
Any RNG created with the same algorithm-seed pair will produce the same sequence of values on all systems and all supporting versions of proptest.
§Panics
Panics if seed is not an appropriate length for algorithm.
pub fn bytes_used(&self) -> Vec<u8> ⓘ
pub fn bytes_used(&self) -> Vec<u8> ⓘ
Dumps the bytes obtained from the RNG so far (only works if the RNG is
set to Recorder).
§Panics
Panics if this RNG does not capture generated data.
pub fn deterministic_rng(algorithm: RngAlgorithm) -> TestRng
pub fn deterministic_rng(algorithm: RngAlgorithm) -> TestRng
Returns a TestRng with a particular hard-coded seed.
The seed value will always be the same for a particular version of Proptest and algorithm, but may change across releases.
This is useful for testing things like strategy implementations without
risking getting “unlucky” RNGs which deviate from average behaviour
enough to cause spurious failures. For example, a strategy for bool
which is supposed to produce true 50% of the time might have a test
which checks that the distribution is “close enough” to 50%. If every
test run starts with a different RNG, occasionally there will be
spurious test failures when the RNG happens to produce a very skewed
distribution. Using this or TestRunner::deterministic() avoids such
issues.
Trait Implementations§
Auto Trait Implementations§
impl Freeze for TestRng
impl RefUnwindSafe for TestRng
impl Send for TestRng
impl Sync for TestRng
impl Unpin for TestRng
impl UnwindSafe for TestRng
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Change the foreground color to bright green
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Set the foreground color to a specific RGB value.
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&self,
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Set the background color to a specific RGB value.
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Sets the foreground color to an RGB value.
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Sets the background color to an RGB value.
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Change the background color to magenta
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Change the foreground color to the terminal default
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Change the background color to the terminal default
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Change the foreground color to bright black
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Change the background color to bright black
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Change the foreground color to bright red
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Change the background color to bright red
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Change the foreground color to bright green
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Change the background color to bright green
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Change the foreground color to bright yellow
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Change the background color to bright yellow
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Change the foreground color to bright blue
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Change the background color to bright blue
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Change the foreground color to bright magenta
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Change the foreground color to bright purple
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Change the foreground color to bright cyan
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Change the background color to bright cyan
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Change the foreground color to bright white
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Change the background color to bright white
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Make the text blink (but fast!)
Hide the text
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fn strikethrough(&self) -> StrikeThroughDisplay<'_, Self>
Cross out the text
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Color: DynColor,
fn color<Color>(&self, color: Color) -> FgDynColorDisplay<'_, Color, Self>where
Color: DynColor,
Set the foreground color at runtime. Only use if you do not know which color will be used at
compile-time. If the color is constant, use either [
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Color: DynColor,
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Color: DynColor,
Set the background color at runtime. Only use if you do not know what color to use at
compile-time. If the color is constant, use either [
OwoColorize::bg] or
a color-specific method, such as [OwoColorize::on_yellow], Read more§fn fg_rgb<const R: u8, const G: u8, const B: u8>(
&self,
) -> FgColorDisplay<'_, CustomColor<R, G, B>, Self>
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Set the foreground color to a specific RGB value.
§fn bg_rgb<const R: u8, const G: u8, const B: u8>(
&self,
) -> BgColorDisplay<'_, CustomColor<R, G, B>, Self>
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Set the background color to a specific RGB value.
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Sets the foreground color to an RGB value.
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Sets the background color to an RGB value.
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