test: add tests for IEEE 754-2019 compliance

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---

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/atan2d/test/test.js

@@ -113,10 +113,17 @@ tape( 'the function returns `-135.0` if provided `x = y = -infinity`', function
 	t.end();
 });
 
-tape( 'the function returns `0.0` when `x = +infinity`', function test( t ) {
-	t.equal( atan2d( -2.0, PINF ), 0.0, 'returns expected value' );
-	t.equal( atan2d( 0.0, PINF ), 0.0, 'returns expected value' );
-	t.equal( atan2d( 2.0, PINF ), 0.0, 'returns expected value' );
+tape( 'the function returns `0.0` when `y > 0` and `x = +infinity`', function test( t ) {
+	t.equal( isPositiveZero( atan2d( 1.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isPositiveZero( atan2d( 2.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isPositiveZero( atan2d( 3.0, PINF ) ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-0.0` when `y < 0` and `x = +infinity`', function test( t ) {
+	t.equal( isNegativeZero( atan2d( -1.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isNegativeZero( atan2d( -2.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isNegativeZero( atan2d( -3.0, PINF ) ), true, 'returns expected value' );
 	t.end();
 });
 
@@ -155,13 +162,27 @@ tape( 'the function returns `90.0` if provided a positive `y` and `x=0`', functi
 	t.end();
 });
 
-tape( 'the function returns `90.0` if provided a negative `y` and `x=0`', function test( t ) {
+tape( 'the function returns `90.0` if provided a positive `y` and `x=-0`', function test( t ) {
+	t.equal( atan2d( 2.0, -0.0 ), 90.0, 'returns expected value' );
+	t.equal( atan2d( 1.0, -0.0 ), 90.0, 'returns expected value' );
+	t.equal( atan2d( 0.5, -0.0 ), 90.0, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-90.0` if provided a negative `y` and `x=0`', function test( t ) {
 	t.equal( atan2d( -2.0, 0.0 ), -90.0, 'returns expected value' );
 	t.equal( atan2d( -1.0, 0.0 ), -90.0, 'returns expected value' );
 	t.equal( atan2d( -0.5, 0.0 ), -90.0, 'returns expected value' );
 	t.end();
 });
 
+tape( 'the function returns `-90.0` if provided a negative `y` and `x=-0`', function test( t ) {
+	t.equal( atan2d( -2.0, -0.0 ), -90.0, 'returns expected value' );
+	t.equal( atan2d( -1.0, -0.0 ), -90.0, 'returns expected value' );
+	t.equal( atan2d( -0.5, -0.0 ), -90.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function evaluates the `atan2d` function (when x and y are positive)', function test( t ) {
 	var expected;
 	var actual;

lib/node_modules/@stdlib/math/base/special/atan2d/test/test.native.js

@@ -122,10 +122,17 @@ tape( 'the function returns `-135.0` if provided `x = y = -infinity`', opts, fun
 	t.end();
 });
 
-tape( 'the function returns `0.0` when `x = +infinity`', opts, function test( t ) {
-	t.equal( atan2d( -2.0, PINF ), 0.0, 'returns expected value' );
-	t.equal( atan2d( 0.0, PINF ), 0.0, 'returns expected value' );
-	t.equal( atan2d( 2.0, PINF ), 0.0, 'returns expected value' );
+tape( 'the function returns `0.0` when `y > 0` and `x = +infinity`', opts, function test( t ) {
+	t.equal( isPositiveZero( atan2d( 1.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isPositiveZero( atan2d( 2.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isPositiveZero( atan2d( 3.0, PINF ) ), true, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-0.0` when `y < 0` and `x = +infinity`', opts, function test( t ) {
+	t.equal( isNegativeZero( atan2d( -1.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isNegativeZero( atan2d( -2.0, PINF ) ), true, 'returns expected value' );
+	t.equal( isNegativeZero( atan2d( -3.0, PINF ) ), true, 'returns expected value' );
 	t.end();
 });
 
@@ -164,13 +171,27 @@ tape( 'the function returns `90.0` if provided a positive `y` and `x=0`', opts,
 	t.end();
 });
 
-tape( 'the function returns `90.0` if provided a negative `y` and `x=0`', opts, function test( t ) {
+tape( 'the function returns `90.0` if provided a positive `y` and `x=-0`', opts, function test( t ) {
+	t.equal( atan2d( 2.0, -0.0 ), 90.0, 'returns expected value' );
+	t.equal( atan2d( 1.0, -0.0 ), 90.0, 'returns expected value' );
+	t.equal( atan2d( 0.5, -0.0 ), 90.0, 'returns expected value' );
+	t.end();
+});
+
+tape( 'the function returns `-90.0` if provided a negative `y` and `x=0`', opts, function test( t ) {
 	t.equal( atan2d( -2.0, 0.0 ), -90.0, 'returns expected value' );
 	t.equal( atan2d( -1.0, 0.0 ), -90.0, 'returns expected value' );
 	t.equal( atan2d( -0.5, 0.0 ), -90.0, 'returns expected value' );
 	t.end();
 });
 
+tape( 'the function returns `-90.0` if provided a negative `y` and `x=-0`', opts, function test( t ) {
+	t.equal( atan2d( -2.0, -0.0 ), -90.0, 'returns expected value' );
+	t.equal( atan2d( -1.0, -0.0 ), -90.0, 'returns expected value' );
+	t.equal( atan2d( -0.5, -0.0 ), -90.0, 'returns expected value' );
+	t.end();
+});
+
 tape( 'the function evaluates the `atan2d` function (when x and y are positive)', opts, function test( t ) {
 	var expected;
 	var actual;