80 lines
2.1 KiB
C++
80 lines
2.1 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(_RandomRange)
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{
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public:
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// Checks that a random double is never outside the specification, two positive values
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TEST_METHOD(Random_Doublerange_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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double rnd = Random::RandomRange(49.0, 99.0);
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Assert::IsTrue(rnd >= 49.0, L"rnd too small");
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Assert::IsTrue(rnd <= 99.0, 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 double is never outside the specification, negative minimum
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TEST_METHOD(Random_Doublerange_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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double rnd = Random::RandomRange(-39.0, 99.0);
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Assert::IsTrue(rnd >= -39.0, L"rnd too small");
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Assert::IsTrue(rnd <= 99.0, 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 double is never outside the specification, two negative values
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TEST_METHOD(Random_Doublerange_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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double rnd = Random::RandomRange(-39.0, -10.0);
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Assert::IsTrue(rnd >= -39.0, L"rnd too small");
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Assert::IsTrue(rnd <= -10.0, L"rnd too big");
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}
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return;
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}
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// Checks that the produced double-precision floating point distribution shows a big standard deviation
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TEST_METHOD(Double_Big_Standard_Deviation)
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{
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// Setup
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std::vector<double> rands;
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rands.resize(100);
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// Exercise
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// Create 1000 random values
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std::generate_n(rands.data(), rands.size(), []()->double { return Random::RandomRange(100, 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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