Maximum size of generated arrays (and strings)
Minimum size of generated arrays (and strings)
You can use this to define default shrink implementation.
You can use this to define only generate function.
You can use this to define default special cases implementation.
Arbitrary for ubyte, byte, ushort, short, uing, int, ulong, long.
Arbitrary for float, double
Arbitrary for bool
Arbitrary template for char, dchar, wchar
Arbitrary template for strings
Arbitrary template for arrays
Check the T type has properly defined Arbitrary template. Prints useful user-friendly messages at compile time.
Checks if T has Arbitrary template with generate, shrink and specialCases functions.
template Arbitrary(T) if(isIntegral!T) { static assert(CheckArbitrary!T); auto generate() { return (() => Maybe!T(uniform!"[]"(T.min, T.max))).generator; } auto shrink(T val) { class Shrinker { T saved; this(T firstVal) { saved = firstVal; } Maybe!T shrink() { if(saved == 0) return Maybe!T.nothing; if(saved > 0) saved--; if(saved < 0) saved++; return Maybe!T(saved); } } return (&(new Shrinker(val)).shrink).generator; } T[] specialCases() { return [T.min, 0, T.max]; } }
Subject to the terms of the MIT license, as written in the included LICENSE file.
© 2014 Anton Gushcha
Module defines routines for generating testing sets.
To define Arbitrary template for particular type T (or types) you should follow compile-time interface: <ul> <li>Define generate function that takes nothing and returns range of T. This function is used to generate random sets of testing data. Size of required sample isn't passed thus use lazy ranges to generate possible infinite set of data.</li> <li>Define shrink function that takes value of T and returns range of truncated variations. This function is used to reduce failing case data to minimum possible set. You can return empty array if you like to get large bunch of random data.</li> <li>Define specialCases function that takes nothing and returns range of T. This function is used to test some special values for particular type like NaN or null pointer. You can return empty array if no testing on special cases is required.</li> </ul>
Usually useful practice is put static assert with CheckArbitrary template into your implementation to actually get confidence that you've done it properly.