101 lines
2.6 KiB
C++
101 lines
2.6 KiB
C++
#include "CppUnitTest.h"
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#include "../_TestingUtilities/Testutil.h"
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#include "../Eule/Random.h"
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#include <array>
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#include <sstream>
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using namespace Microsoft::VisualStudio::CppUnitTestFramework;
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using namespace Eule;
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namespace _Random
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{
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TEST_CLASS(_RandomIntRange)
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{
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public:
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// Checks that a random integer is never outside the specification, two positive values
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TEST_METHOD(Never_Outside_Specification__pos__pos)
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{
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// Test 1000 random integers
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for (std::size_t i = 0; i < 1000; i++)
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{
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int rnd = Random::RandomIntRange(49, 99);
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Assert::IsTrue(rnd >= 49, L"rnd too small");
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Assert::IsTrue(rnd <= 99, L"rnd too big");
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}
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return;
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}
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// Checks that a random integer is never outside the specification, negative minimum
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TEST_METHOD(Never_Outside_Specification__neg__pos)
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{
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// Test 1000 random integers
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for (std::size_t i = 0; i < 1000; i++)
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{
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int rnd = Random::RandomIntRange(-39, 99);
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Assert::IsTrue(rnd >= -39, L"rnd too small");
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Assert::IsTrue(rnd <= 99, L"rnd too big");
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}
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return;
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}
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// Checks that a random integer is never outside the specification, two negative values
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TEST_METHOD(Never_Outside_Specification__neg__neg)
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{
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// Test 1000 random integers
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for (std::size_t i = 0; i < 1000; i++)
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{
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int rnd = Random::RandomIntRange(-39, -10);
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Assert::IsTrue(rnd >= -39, L"rnd too small");
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Assert::IsTrue(rnd <= -10, L"rnd too big");
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}
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return;
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}
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// Checks that the random intrange method also returns the supplied limits
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TEST_METHOD(Inclusivity)
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{
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// Test 1000 random integers
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// The chance that any number [0,9] will not drop at least once is basically 0
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std::array<bool, 10> foundDigits;
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foundDigits.fill(false);
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for (std::size_t i = 0; i < 1000; i++)
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{
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int randomVal = Random::RandomIntRange(0, 9);
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foundDigits[randomVal] = true;
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}
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// Check that each value has been rolled at least once
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for (const bool& b : foundDigits)
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Assert::IsTrue(b);
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return;
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}
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// Checks that the produced integer distribution shows a big standard deviation
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TEST_METHOD(Big_Standard_Deviation)
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{
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// Setup
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std::vector<int> rands;
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rands.resize(1000);
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// Exercise
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// Create 1000 random values
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std::generate_n(rands.data(), rands.size(), []()->int { return Random::RandomIntRange(100, (int)4e9); });
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// Verify
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const double stddev = Testutil::Stddev(rands);
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Assert::IsTrue(stddev >= 1000000, (std::wstringstream() << stddev).str().c_str());
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return;
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}
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};
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}
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