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STYLE: ResetNextSeed GTest should not use instance for GetNextSeed call #4290

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Nov 8, 2023
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STYLE: ResetNextSeed GTest should not use instance for GetNextSeed call #4290

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10 changes: 6 additions & 4 deletions Modules/Core/Common/test/itkMersenneTwisterRandomVariateGeneratorGTest.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -64,14 +64,16 @@ TEST(MersenneTwisterRandomVariateGenerator, GetIntegerVariateReturnsSameAsStdMt1
}


// Tests that two GetNextSeed() calls return the very same seed value, when ResetNextSeed() is called before each of
// those calls.
TEST(MersenneTwisterRandomVariateGenerator, ResetNextSeed)
{
const auto globalGenerator = MersenneTwisterRandomVariateGenerator::GetInstance();
ASSERT_NE(globalGenerator, nullptr);
// Call GetInstance() beforehand, to make sure the global instance is there already when calling GetNextSeed().
[[maybe_unused]] const auto globalGenerator = MersenneTwisterRandomVariateGenerator::GetInstance();

MersenneTwisterRandomVariateGenerator::ResetNextSeed();
const auto nextSeed = globalGenerator->GetNextSeed();
const auto seed = MersenneTwisterRandomVariateGenerator::GetNextSeed();

MersenneTwisterRandomVariateGenerator::ResetNextSeed();
EXPECT_EQ(globalGenerator->GetNextSeed(), nextSeed);
EXPECT_EQ(MersenneTwisterRandomVariateGenerator::GetNextSeed(), seed);
}