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Have the random generators use the global rng instance

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This means that if you nest multiple random generators inside one
test case, they will not return the same sequence of numbers.

Idea taken from #1736 by Amit Herman.

Closes #1736
Closes #1734
This commit is contained in:
Martin Hořeňovský 2019-10-07 20:24:37 +02:00
parent 535da5c513
commit a5a22cdadb
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2 changed files with 33 additions and 8 deletions
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27
projects/SelfTest/IntrospectiveTests/GeneratorsImpl.tests.cpp
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@ -250,7 +250,7 @@ int const& TestGen::get() const {
}
TEST_CASE("GENERATE capture macros", "[generators][internals][.approvals]") {
TEST_CASE("GENERATE capture macros", "[generators][internals][approvals]") {
auto value = GENERATE(take(10, random(0, 10)));
non_copyable nc; nc.value = value;
@ -258,3 +258,28 @@ TEST_CASE("GENERATE capture macros", "[generators][internals][.approvals]") {
auto value2 = GENERATE_REF(Catch::Generators::GeneratorWrapper<int>(std::unique_ptr<Catch::Generators::IGenerator<int>>(new TestGen(nc))));
REQUIRE(value == value2);
}
TEST_CASE("Multiple random generators in one test case output different values", "[generators][internals][approvals]") {
SECTION("Integer") {
auto random1 = Catch::Generators::random(0, 1000);
auto random2 = Catch::Generators::random(0, 1000);
size_t same = 0;
for (size_t i = 0; i < 1000; ++i) {
same += random1.get() == random2.get();
random1.next(); random2.next();
}
// 0.5% seems like a sane bound for random identical elements within 1000 runs
REQUIRE(same < 5);
}
SECTION("Float") {
auto random1 = Catch::Generators::random(0., 1000.);
auto random2 = Catch::Generators::random(0., 1000.);
size_t same = 0;
for (size_t i = 0; i < 1000; ++i) {
same += random1.get() == random2.get();
random1.next(); random2.next();
}
// 0.5% seems like a sane bound for random identical elements within 1000 runs
REQUIRE(same < 5);
}
}