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test(math/base/special/cosm1): add tests for signed zeros #9498

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test(math/base/special/cosm1): add tests for signed zeros #9498

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13 changes: 13 additions & 0 deletions lib/node_modules/@stdlib/math/base/special/cosm1/test/test.js
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Expand Up @@ -51,6 +51,19 @@ tape( 'main export is a function', function test( t ) {
t.end();
});

tape( 'the function returns positive zero for zero and negative zero', function test( t ) {
var v1 = cosm1( 0.0 );
var v2 = cosm1( -0.0 );

t.strictEqual( v1, 0.0, 'returns +0 for +0' );
t.strictEqual( 1.0/v1, PINF, 'returns +0 (not -0)' );

t.strictEqual( v2, 0.0, 'returns +0 for -0' );
t.strictEqual( 1.0/v2, PINF, 'returns +0 (not -0)' );

t.end();
});

tape( 'the function computes the cosine minus one more accurately inside the interval [-π/4,π/4]', function test( t ) {
var expected;
var x;
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