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lerpDouble: add tests for NaN, infinity #20848

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cbracken merged 1 commit into from
Aug 28, 2020
Merged

lerpDouble: add tests for NaN, infinity #20848

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44 changes: 44 additions & 0 deletions testing/dart/lerp_test.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -43,4 +43,48 @@ void main() {
expect(lerpDouble(0.0, 10.0, 5.0), 50.0);
expect(lerpDouble(10.0, 0.0, 5.0), -40.0);
});

test('lerpDouble should return NaN if any input is NaN', () {
expect(lerpDouble(0.0, 10.0, double.nan), isNaN);
expect(lerpDouble(0.0, double.infinity, double.nan), isNaN);
expect(lerpDouble(0.0, double.nan, 5.0), isNaN);
expect(lerpDouble(0.0, double.nan, double.infinity), isNaN);
expect(lerpDouble(0.0, double.nan, double.nan), isNaN);
expect(lerpDouble(double.infinity, 10.0, double.nan), isNaN);
expect(lerpDouble(double.infinity, double.infinity, double.nan), isNaN);
expect(lerpDouble(double.infinity, double.nan, 5.0), isNaN);
expect(lerpDouble(double.infinity, double.nan, double.infinity), isNaN);
expect(lerpDouble(double.infinity, double.nan, double.nan), isNaN);
expect(lerpDouble(double.nan, 10.0, 5.0), isNaN);
expect(lerpDouble(double.nan, 10.0, double.infinity), isNaN);
expect(lerpDouble(double.nan, 10.0, double.nan), isNaN);
expect(lerpDouble(double.nan, double.infinity, 5.0), isNaN);
expect(lerpDouble(double.nan, double.infinity, double.infinity), isNaN);
expect(lerpDouble(double.nan, double.infinity, double.nan), isNaN);
expect(lerpDouble(double.nan, double.nan, 5.0), isNaN);
expect(lerpDouble(double.nan, double.nan, double.infinity), isNaN);
expect(lerpDouble(double.nan, double.nan, double.nan), isNaN);
});

test('lerpDouble returns NaN if interpolation results in Infinity - Infinity', () {
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@cbracken cbracken Aug 28, 2020

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I feel like there has to be a better way to word this, but can't think of anything great.

expect(lerpDouble(double.infinity, 10.0, 5.0), isNaN);
expect(lerpDouble(double.infinity, 10.0, double.infinity), isNaN);
expect(lerpDouble(-double.infinity, 10.0, 5.0), isNaN);
expect(lerpDouble(-double.infinity, 10.0, double.infinity), isNaN);
});

test('lerpDouble returns +/- infinity if interpolating towards an infinity', () {
expect(lerpDouble(double.infinity, 10.0, -5.0)?.isInfinite, isTrue);
expect(lerpDouble(double.infinity, 10.0, -double.infinity)?.isInfinite, isTrue);
expect(lerpDouble(-double.infinity, 10.0, -5.0)?.isInfinite, isTrue);
expect(lerpDouble(-double.infinity, 10.0, -double.infinity)?.isInfinite, isTrue);
expect(lerpDouble(0.0, double.infinity, 5.0)?.isInfinite, isTrue);
expect(lerpDouble(0.0, double.infinity, -5.0)?.isInfinite, isTrue);
expect(lerpDouble(0.0, 10.0, double.infinity)?.isInfinite, isTrue);
expect(lerpDouble(0.0, double.infinity, double.infinity)?.isInfinite, isTrue);
});

test('lerpDouble returns NaN if start/end and interpolation value are infinity', () {
expect(lerpDouble(double.infinity, double.infinity, double.infinity), isNaN);
});
}