text: /**
  * @license Apache-2.0
  *
  * Copyright (c) 2018 The Stdlib Authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *    http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
  
  'use strict';
  
  // MODULES //
  
  var tape = require( 'tape' );
  var isnan = require( '@stdlib/math-base-assert-is-nan' );
  var PINF = require( '@stdlib/constants-float64-pinf' );
  var NINF = require( '@stdlib/constants-float64-ninf' );
  var EPS = require( '@stdlib/constants-float64-eps' );
  var abs = require( '@stdlib/math-base-special-abs' );
  var hacoversin = require( './../lib' );
  
  
  // FIXTURES //
  
  var mediumNegative = require( './fixtures/julia/medium_negative.json' );
  var mediumPositive = require( './fixtures/julia/medium_positive.json' );
  var largeNegative = require( './fixtures/julia/large_negative.json' );
  var largePositive = require( './fixtures/julia/large_positive.json' );
  var hugeNegative = require( './fixtures/julia/huge_negative.json' );
  var hugePositive = require( './fixtures/julia/huge_positive.json' );
  
  
  // TESTS //
  
  tape( 'main export is a function', function test( t ) {
  	t.ok( true, __filename );
  	t.equal( typeof hacoversin, 'function', 'main export is a function' );
  	t.end();
  });
  
  tape( 'the function computes the half-value coversed sine (for -256*pi < x < 0)', function test( t ) {
  	var expected;
  	var delta;
  	var tol;
  	var x;
  	var y;
  	var i;
  
  	x = mediumNegative.x;
  	expected = mediumNegative.expected;
  
  	for ( i = 0; i < x.length; i++ ) {
  		y = hacoversin( x[i] );
  		if ( y === expected[ i ] ) {
  			t.equal( y, expected[ i ], 'x: '+x[i]+'. Expected: '+expected[i] );
  		} else {
  			delta = abs( y - expected[i] );
  			tol = EPS * abs( expected[i] );
  			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. Value: '+y+'. Expected: '+expected[i]+'. tol: '+tol+'. delta: '+delta+'.' );
  		}
  	}
  	t.end();
  });
  
  tape( 'the function computes the half-value coversed sine (for 0 < x < 256*pi)', function test( t ) {
  	var expected;
  	var delta;
  	var tol;
  	var x;
  	var y;
  	var i;
  
  	x = mediumPositive.x;
  	expected = mediumPositive.expected;
  
  	for ( i = 0; i < x.length; i++ ) {
  		y = hacoversin( x[i] );
  		if ( y === expected[ i ] ) {
  			t.equal( y, expected[ i ], 'x: '+x[i]+'. Expected: '+expected[i] );
  		} else {
  			delta = abs( y - expected[i] );
  			tol = EPS * abs( expected[i] );
  			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. Value: '+y+'. Expected: '+expected[i]+'. tol: '+tol+'. delta: '+delta+'.' );
  		}
  	}
  	t.end();
  });
  
  tape( 'the function computes the half-value coversed sine (for -2**60 (pi/2) < x < -2**20 (pi/2))', function test( t ) {
  	var expected;
  	var delta;
  	var tol;
  	var x;
  	var y;
  	var i;
  
  	x = largeNegative.x;
  	expected = largeNegative.expected;
  
  	for ( i = 0; i < x.length; i++ ) {
  		y = hacoversin( x[i] );
  		if ( y === expected[ i ] ) {
  			t.equal( y, expected[ i ], 'x: '+x[i]+'. Expected: '+expected[i] );
  		} else {
  			delta = abs( y - expected[i] );
  			tol = EPS * abs( expected[i] );
  			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. Value: '+y+'. Expected: '+expected[i]+'. tol: '+tol+'. delta: '+delta+'.' );
  		}
  	}
  	t.end();
  });
  
  tape( 'the function computes the half-value coversed sine (for 2**20 (pi/2) < x < 2**60 (pi/2))', function test( t ) {
  	var expected;
  	var delta;
  	var tol;
  	var x;
  	var y;
  	var i;
  
  	x = largePositive.x;
  	expected = largePositive.expected;
  
  	for ( i = 0; i < x.length; i++ ) {
  		y = hacoversin( x[i] );
  		if ( y === expected[ i ] ) {
  			t.equal( y, expected[ i ], 'x: '+x[i]+'. Expected: '+expected[i] );
  		} else {
  			delta = abs( y - expected[i] );
  			tol = EPS * abs( expected[i] );
  			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. Value: '+y+'. Expected: '+expected[i]+'. tol: '+tol+'. delta: '+delta+'.' );
  		}
  	}
  	t.end();
  });
  
  tape( 'the function computes the half-value coversed sine (for x <= -2**60 (PI/2))', function test( t ) {
  	var expected;
  	var delta;
  	var tol;
  	var x;
  	var y;
  	var i;
  
  	x = hugeNegative.x;
  	expected = hugeNegative.expected;
  
  	for ( i = 0; i < x.length; i++ ) {
  		y = hacoversin( x[i] );
  		if ( y === expected[ i ] ) {
  			t.equal( y, expected[ i ], 'x: '+x[i]+'. Expected: '+expected[i] );
  		} else {
  			delta = abs( y - expected[i] );
  			tol = EPS * abs( expected[i] );
  			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. Value: '+y+'. Expected: '+expected[i]+'. tol: '+tol+'. delta: '+delta+'.' );
  		}
  	}
  	t.end();
  });
  
  tape( 'the function computes the half-value coversed sine (for x >= 2**60 (PI/2))', function test( t ) {
  	var expected;
  	var delta;
  	var tol;
  	var x;
  	var y;
  	var i;
  
  	x = hugePositive.x;
  	expected = hugePositive.expected;
  
  	for ( i = 0; i < x.length; i++ ) {
  		y = hacoversin( x[i] );
  		if ( y === expected[ i ] ) {
  			t.equal( y, expected[ i ], 'x: '+x[i]+'. Expected: '+expected[i] );
  		} else {
  			delta = abs( y - expected[i] );
  			tol = EPS * abs( expected[i] );
  			t.ok( delta <= tol, 'within tolerance. x: '+x[i]+'. Value: '+y+'. Expected: '+expected[i]+'. tol: '+tol+'. delta: '+delta+'.' );
  		}
  	}
  	t.end();
  });
  
  tape( 'the function returns `NaN` if provided a `NaN`', function test( t ) {
  	var v = hacoversin( NaN );
  	t.equal( isnan( v ), true, 'returns NaN' );
  	t.end();
  });
  
  tape( 'the function returns `NaN` if provided `+infinity`', function test( t ) {
  	var v = hacoversin( PINF );
  	t.equal( isnan( v ), true, 'returns NaN' );
  	t.end();
  });
  
  tape( 'the function returns `NaN` if provided `-infinity`', function test( t ) {
  	var v = hacoversin( NINF );
  	t.equal( isnan( v ), true, 'returns NaN' );
  	t.end();
  });
  