// Distance from the full range should always be zero.
TEST_F(RangeTests, DistanceFrom_InfiniteRange) {
const Range full(-kInf, kInf);
EXPECT_EQ(0.0f, full.DistanceFrom(0.0f));
EXPECT_EQ(0.0f, full.DistanceFrom(1.0f));
// Note: Doesn't work when passing in kInf because kInf - kInf = NaN.
// EXPECT_EQ(0.0f, full.DistanceFrom(kInf));
// EXPECT_EQ(0.0f, full.DistanceFrom(-kInf));
}
// Distance from the range should always be infinity for infinite values.
TEST_F(RangeTests, DistanceFrom_Infinity) {
const Range zero_one(0.0f, 1.0f);
EXPECT_EQ(kInf, zero_one.DistanceFrom(kInf));
EXPECT_EQ(kInf, zero_one.DistanceFrom(-kInf));
}
// Distance from the range should be zero for elements on the border.
TEST_F(RangeTests, DistanceFrom_Border) {
const Range zero_one(0.0f, 1.0f);
EXPECT_EQ(0.0f, zero_one.DistanceFrom(0.0f));
EXPECT_EQ(0.0f, zero_one.DistanceFrom(1.0f));
}
// Distance from the range should be match for elements outside the range.
TEST_F(RangeTests, DistanceFrom_Outside) {
const Range zero_one(0.0f, 1.0f);
EXPECT_EQ(1.0f, zero_one.DistanceFrom(-1.0f));
EXPECT_NEAR(0.2f, zero_one.DistanceFrom(1.2f), 0.000001f);
}
// Distance from the range should be zero for elements inside the range.
TEST_F(RangeTests, DistanceFrom_Inside) {
const Range zero_one(0.0f, 1.0f);
EXPECT_EQ(0.0f, zero_one.DistanceFrom(0.0000001f));
EXPECT_EQ(0.0f, zero_one.DistanceFrom(0.5f));
EXPECT_EQ(0.0f, zero_one.DistanceFrom(0.9f));
}