src/dawn/tests/unittests/RangeTests.cpp

// Copyright 2023 The Dawn & Tint Authors
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#include "dawn/common/Compiler.h"
#include "dawn/common/Range.h"
#include "dawn/common/TypedInteger.h"
#include "gtest/gtest.h"

namespace dawn {
namespace {

// Test that iterating an empty range doesn't iterate at all.
TEST(RangeTests, Empty) {
    for ([[maybe_unused]] auto i : Range(0)) {
        // Silence a -Wunreachable-code-loop-increment
        if ((0)) {
            continue;
        }
        FAIL();
    }
    for ([[maybe_unused]] auto i : Range(0, 0)) {
        // Silence a -Wunreachable-code-loop-increment
        if ((0)) {
            continue;
        }
        FAIL();
    }
}

// Test iterating with just an end.
TEST(RangeTests, JustEnd) {
    int count = 0;
    for (auto i : Range(45)) {
        ASSERT_EQ(count, i);
        count++;
    }
    ASSERT_EQ(count, 45);
}

// Test iterating with a start and an end.
TEST(RangeTests, StartAndEnd) {
    int count = 18;
    for (auto i : Range(18, 45)) {
        ASSERT_EQ(count, i);
        count++;
    }
    ASSERT_EQ(count, 45);
}

// Test iterating with a start and an end.
TEST(RangeTests, StartAndEnd_ITyp) {
    using Int = TypedInteger<struct IntT, int>;

    Int count{18};
    for (auto i : Range(Int{18}, Int{45})) {
        ASSERT_EQ(count, i);
        count++;
    }
    ASSERT_EQ(count, Int{45});
}

}  // anonymous namespace
}  // namespace dawn