proptest::test_runner

Enum FileFailurePersistence

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pub enum FileFailurePersistence {
    Off,
    SourceParallel(&'static str),
    WithSource(&'static str),
    Direct(&'static str),
    // some variants omitted
}
Expand description

Describes how failing test cases are persisted.

Note that file names in this enum are &str rather than &Path since constant functions are not yet in Rust stable as of 2017-12-16.

In all cases, if a derived path references a directory which does not yet exist, proptest will attempt to create all necessary parent directories.

Variants§

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Off

Completely disables persistence of failing test cases.

This is semantically equivalent to Direct("/dev/null") on Unix and Direct("NUL") on Windows (though it is internally handled by simply not doing any I/O).

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SourceParallel(&'static str)

The path of the source file under test is traversed up the directory tree until a directory containing a file named lib.rs or main.rs is found. A sibling to that directory with the name given by the string in this configuration is created, and a file with the same name and path relative to the source directory, but with the extension changed to .txt, is used.

For example, given a source path of /home/jsmith/code/project/src/foo/bar.rs and a configuration of SourceParallel("proptest-regressions") (the default), assuming the src directory has a lib.rs or main.rs, the resulting file would be /home/jsmith/code/project/proptest-regressions/foo/bar.txt.

If no lib.rs or main.rs can be found, a warning is printed and this behaves like WithSource.

If no source file has been configured, a warning is printed and this behaves like Off.

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WithSource(&'static str)

Failures are persisted in a file with the same path as the source file under test, but the extension is changed to the string given in this configuration.

For example, given a source path of /home/jsmith/code/project/src/foo/bar.rs and a configuration of WithSource("regressions"), the resulting path would be /home/jsmith/code/project/src/foo/bar.regressions.

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Direct(&'static str)

The string given in this option is directly used as a file path without any further processing.

Trait Implementations§

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impl Clone for FileFailurePersistence

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fn clone(&self) -> FileFailurePersistence

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for FileFailurePersistence

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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 FileFailurePersistence

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl FailurePersistence for FileFailurePersistence

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fn load_persisted_failures2( &self, source_file: Option<&'static str>, ) -> Vec<PersistedSeed>

Supply seeds associated with the given source_file that may be used by a TestRunner’s random number generator in order to consistently recreate a previously-failing Strategy-provided value. Read more
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fn save_persisted_failure2( &mut self, source_file: Option<&'static str>, seed: PersistedSeed, shrunken_value: &dyn Debug, )

Store a new failure-generating seed associated with the given source_file. Read more
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fn box_clone(&self) -> Box<dyn FailurePersistence>

Delegate method for producing a trait object usable with Clone
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fn eq(&self, other: &dyn FailurePersistence) -> bool

Equality testing delegate required due to constraints of trait objects.
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fn as_any(&self) -> &dyn Any

Assistant method for trait object comparison.
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fn load_persisted_failures( &self, source_file: Option<&'static str>, ) -> Vec<[u8; 16]>

👎Deprecated
Use load_persisted_failures2 instead. Read more
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fn save_persisted_failure( &mut self, source_file: Option<&'static str>, seed: [u8; 16], shrunken_value: &dyn Debug, )

👎Deprecated
Use save_persisted_failures2 instead. Read more
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impl PartialEq for FileFailurePersistence

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fn eq(&self, other: &FileFailurePersistence) -> 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 Copy for FileFailurePersistence

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impl StructuralPartialEq for FileFailurePersistence

Auto Trait Implementations§

Blanket 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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V