mirror of
https://github.com/catchorg/Catch2.git
synced 2024-11-14 17:59:54 +01:00
338 lines
12 KiB
C++
338 lines
12 KiB
C++
#include "catch.hpp"
|
|
|
|
// Tests of generator implementation details
|
|
TEST_CASE("Generators internals", "[generators][internals]") {
|
|
using namespace Catch::Generators;
|
|
|
|
SECTION("Single value") {
|
|
auto gen = value(123);
|
|
REQUIRE(gen.get() == 123);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Preset values") {
|
|
auto gen = values({ 1, 3, 5 });
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 3);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 5);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Generator combinator") {
|
|
auto gen = makeGenerators(1, 5, values({ 2, 4 }), 0);
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 5);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 4);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 0);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Explicitly typed generator sequence") {
|
|
auto gen = makeGenerators(as<std::string>{}, "aa", "bb", "cc");
|
|
// This just checks that the type is std::string:
|
|
REQUIRE(gen.get().size() == 2);
|
|
// Iterate over the generator
|
|
REQUIRE(gen.get() == "aa");
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == "bb");
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == "cc");
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Filter generator") {
|
|
// Normal usage
|
|
auto gen = filter([] (int i) { return i != 2; }, values({ 2, 1, 2, 3, 2, 2 }));
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 3);
|
|
REQUIRE_FALSE(gen.next());
|
|
|
|
// Completely filtered-out generator should throw on construction
|
|
REQUIRE_THROWS_AS(filter([] (int) { return false; }, value(1)), Catch::GeneratorException);
|
|
}
|
|
SECTION("Take generator") {
|
|
SECTION("Take less") {
|
|
auto gen = take(2, values({ 1, 2, 3 }));
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Take more") {
|
|
auto gen = take(2, value(1));
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
}
|
|
SECTION("Map with explicit return type") {
|
|
auto gen = map<double>([] (int i) {return 2.0 * i; }, values({ 1, 2, 3 }));
|
|
REQUIRE(gen.get() == 2.0);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 4.0);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 6.0);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Map with deduced return type") {
|
|
auto gen = map([] (int i) {return 2.0 * i; }, values({ 1, 2, 3 }));
|
|
REQUIRE(gen.get() == 2.0);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 4.0);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 6.0);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Repeat") {
|
|
SECTION("Singular repeat") {
|
|
auto gen = repeat(1, value(3));
|
|
REQUIRE(gen.get() == 3);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Actual repeat") {
|
|
auto gen = repeat(2, values({ 1, 2, 3 }));
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 3);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 3);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
}
|
|
SECTION("Range") {
|
|
SECTION("Positive auto step") {
|
|
SECTION("Integer") {
|
|
auto gen = range(-2, 2);
|
|
REQUIRE(gen.get() == -2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 0);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
}
|
|
SECTION("Negative auto step") {
|
|
SECTION("Integer") {
|
|
auto gen = range(2, -2);
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 0);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
}
|
|
SECTION("Positive manual step") {
|
|
SECTION("Integer") {
|
|
SECTION("Exact") {
|
|
auto gen = range(-7, 5, 3);
|
|
REQUIRE(gen.get() == -7);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -4);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Slightly over end") {
|
|
auto gen = range(-7, 4, 3);
|
|
REQUIRE(gen.get() == -7);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -4);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Slightly under end") {
|
|
auto gen = range(-7, 6, 3);
|
|
REQUIRE(gen.get() == -7);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -4);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 5);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
}
|
|
|
|
SECTION("Floating Point") {
|
|
SECTION("Exact") {
|
|
const auto rangeStart = -1.;
|
|
const auto rangeEnd = 1.;
|
|
const auto step = .1;
|
|
|
|
auto gen = range(rangeStart, rangeEnd, step);
|
|
auto expected = rangeStart;
|
|
while( (rangeEnd - expected) > step ) {
|
|
INFO( "Current expected value is " << expected );
|
|
REQUIRE(gen.get() == Approx(expected));
|
|
REQUIRE(gen.next());
|
|
|
|
expected += step;
|
|
}
|
|
REQUIRE(gen.get() == Approx( rangeEnd ) );
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Slightly over end") {
|
|
const auto rangeStart = -1.;
|
|
const auto rangeEnd = 1.;
|
|
const auto step = .3;
|
|
|
|
auto gen = range(rangeStart, rangeEnd, step);
|
|
auto expected = rangeStart;
|
|
while( (rangeEnd - expected) > step ) {
|
|
INFO( "Current expected value is " << expected );
|
|
REQUIRE(gen.get() == Approx(expected));
|
|
REQUIRE(gen.next());
|
|
|
|
expected += step;
|
|
}
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Slightly under end") {
|
|
const auto rangeStart = -1.;
|
|
const auto rangeEnd = .9;
|
|
const auto step = .3;
|
|
|
|
auto gen = range(rangeStart, rangeEnd, step);
|
|
auto expected = rangeStart;
|
|
while( (rangeEnd - expected) > step ) {
|
|
INFO( "Current expected value is " << expected );
|
|
REQUIRE(gen.get() == Approx(expected));
|
|
REQUIRE(gen.next());
|
|
|
|
expected += step;
|
|
}
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
}
|
|
}
|
|
SECTION("Negative manual step") {
|
|
SECTION("Integer") {
|
|
SECTION("Exact") {
|
|
auto gen = range(5, -7, -3);
|
|
REQUIRE(gen.get() == 5);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -4);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Slightly over end") {
|
|
auto gen = range(5, -6, -3);
|
|
REQUIRE(gen.get() == 5);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -4);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
SECTION("Slightly under end") {
|
|
auto gen = range(5, -8, -3);
|
|
REQUIRE(gen.get() == 5);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == 2);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -1);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -4);
|
|
REQUIRE(gen.next());
|
|
REQUIRE(gen.get() == -7);
|
|
REQUIRE_FALSE(gen.next());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
// todo: uncopyable type used in a generator
|
|
// idea: uncopyable tag type for a stupid generator
|
|
|
|
namespace {
|
|
struct non_copyable {
|
|
non_copyable() = default;
|
|
non_copyable(non_copyable const&) = delete;
|
|
non_copyable& operator=(non_copyable const&) = delete;
|
|
int value = -1;
|
|
};
|
|
|
|
// This class shows how to implement a simple generator for Catch tests
|
|
class TestGen : public Catch::Generators::IGenerator<int> {
|
|
int current_number;
|
|
public:
|
|
|
|
TestGen(non_copyable const& nc):
|
|
current_number(nc.value) {}
|
|
|
|
int const& get() const override;
|
|
bool next() override {
|
|
return false;
|
|
}
|
|
};
|
|
|
|
// Avoids -Wweak-vtables
|
|
int const& TestGen::get() const {
|
|
return current_number;
|
|
}
|
|
|
|
}
|
|
|
|
TEST_CASE("GENERATE capture macros", "[generators][internals][approvals]") {
|
|
auto value = GENERATE(take(10, random(0, 10)));
|
|
|
|
non_copyable nc; nc.value = value;
|
|
// neither `GENERATE_COPY` nor plain `GENERATE` would compile here
|
|
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);
|
|
}
|
|
}
|