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catch2/projects/SelfTest/IntrospectiveTests/GeneratorsImpl.tests.cpp

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First attempt at data generator support The support is to be considered experimental, that is, the interfaces, the first party generators and helper functions can change or be removed at any point in time. Related to #850
2018-06-12 18:50:39 +02:00
#include "catch.hpp"
Redo generator interface
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// Tests of generator implementation details
TEST_CASE("Generators internals", "[generators][internals]") {
First attempt at data generator support The support is to be considered experimental, that is, the interfaces, the first party generators and helper functions can change or be removed at any point in time. Related to #850
2018-06-12 18:50:39 +02:00
using namespace Catch::Generators;
Redo generator interface
2019-01-27 19:46:28 +01:00
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());
First attempt at data generator support The support is to be considered experimental, that is, the interfaces, the first party generators and helper functions can change or be removed at any point in time. Related to #850
2018-06-12 18:50:39 +02:00
}
Add generic generator modifiers This means mutiple generic generators and some inference helper * take(n, generator) * filter(predicate, generator) * map(func, generator) * repeat(generator, repeats)
2019-01-27 23:50:43 +01:00
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") {
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("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());
}
}
Add RangeGenerator
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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("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());
}
}
}
}
Add generic generator modifiers This means mutiple generic generators and some inference helper * take(n, generator) * filter(predicate, generator) * map(func, generator) * repeat(generator, repeats)
2019-01-27 23:50:43 +01:00
First attempt at data generator support The support is to be considered experimental, that is, the interfaces, the first party generators and helper functions can change or be removed at any point in time. Related to #850
2018-06-12 18:50:39 +02:00
}
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