mirror of https://github.com/catchorg/Catch2.git
104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
#include "catch.hpp"
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// Tests of generator implementation details
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TEST_CASE("Generators internals", "[generators][internals]") {
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using namespace Catch::Generators;
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SECTION("Single value") {
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auto gen = value(123);
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REQUIRE(gen.get() == 123);
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REQUIRE_FALSE(gen.next());
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}
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SECTION("Preset values") {
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auto gen = values({ 1, 3, 5 });
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REQUIRE(gen.get() == 1);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 3);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 5);
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REQUIRE_FALSE(gen.next());
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}
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SECTION("Generator combinator") {
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auto gen = makeGenerators(1, 5, values({ 2, 4 }), 0);
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REQUIRE(gen.get() == 1);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 5);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 2);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 4);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 0);
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REQUIRE_FALSE(gen.next());
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}
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SECTION("Explicitly typed generator sequence") {
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auto gen = makeGenerators(as<std::string>{}, "aa", "bb", "cc");
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// This just checks that the type is std::string:
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REQUIRE(gen.get().size() == 2);
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// Iterate over the generator
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REQUIRE(gen.get() == "aa");
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REQUIRE(gen.next());
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REQUIRE(gen.get() == "bb");
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REQUIRE(gen.next());
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REQUIRE(gen.get() == "cc");
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REQUIRE_FALSE(gen.next());
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}
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SECTION("Filter generator") {
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// Normal usage
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auto gen = filter([] (int i) { return i != 2; }, values({ 2, 1, 2, 3, 2, 2 }));
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REQUIRE(gen.get() == 1);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 3);
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REQUIRE_FALSE(gen.next());
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// Completely filtered-out generator should throw on construction
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REQUIRE_THROWS_AS(filter([] (int) { return false; }, value(1)), Catch::GeneratorException);
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}
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SECTION("Take generator") {
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SECTION("Take less") {
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auto gen = take(2, values({ 1, 2, 3 }));
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REQUIRE(gen.get() == 1);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 2);
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REQUIRE_FALSE(gen.next());
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}
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SECTION("Take more") {
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auto gen = take(2, value(1));
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REQUIRE(gen.get() == 1);
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REQUIRE_FALSE(gen.next());
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}
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}
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SECTION("Map") {
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auto gen = map<double>([] (int i) {return 2.0 * i; }, values({ 1, 2, 3 }));
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REQUIRE(gen.get() == 2.0);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 4.0);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 6.0);
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REQUIRE_FALSE(gen.next());
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}
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SECTION("Repeat") {
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SECTION("Singular repeat") {
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auto gen = repeat(1, value(3));
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REQUIRE(gen.get() == 3);
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REQUIRE_FALSE(gen.next());
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}
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SECTION("Actual repeat") {
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auto gen = repeat(2, values({ 1, 2, 3 }));
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REQUIRE(gen.get() == 1);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 2);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 3);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 1);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 2);
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REQUIRE(gen.next());
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REQUIRE(gen.get() == 3);
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REQUIRE_FALSE(gen.next());
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}
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}
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}
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