test: ensure deterministic values and use approximate equality for native addon

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---

Author: Planeshifter

lib/node_modules/@stdlib/math/base/special/log1mexp/test/test.js

@@ -23,7 +23,7 @@
 var tape = require( 'tape' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
 var abs = require( '@stdlib/math/base/special/abs' );
 var exp = require( '@stdlib/math/base/special/exp' );
 var expm1 = require( '@stdlib/math/base/special/expm1' );
@@ -67,13 +67,17 @@ tape( 'if provided `+-0`, the function returns -infinity', function test( t ) {
 });
 
 tape( 'the function computes the natural logarithm of `1-exp(-|x|)` (`0 < |x| <= ln(2)`)', function test( t ) {
+	var rand;
 	var x;
 	var y;
 	var v;
 	var i;
 
+	rand = uniform.factory( 0.0, LN2, {
+		'seed': 129
+	});
 	for ( i = 0; i < 1e3; i++ ) {
-		v = randu() * LN2;
+		v = rand();
 		x = log1mexp( v );
 		y = ln( -expm1( -v ) );
 		t.strictEqual( x, y, 'returns '+y+' when provided '+v );
@@ -82,13 +86,18 @@ tape( 'the function computes the natural logarithm of `1-exp(-|x|)` (`0 < |x| <=
 });
 
 tape( 'the function computes the natural logarithm of `1-exp(-|x|)` (`x > ln(2)`)', function test( t ) {
+	var rand;
 	var x;
 	var y;
 	var v;
 	var i;
 
+	rand = uniform.factory( LN2 + EPS, 100.0, {
+		'seed': 91919
+	});
+
 	for ( i = 0; i < 1e3; i++ ) {
-		v = LN2 + EPS + (randu()*100.0);
+		v = rand();
 		x = log1mexp( v );
 		y = log1p( -exp( -v ) );
 		t.strictEqual( x, y, 'returns '+y+' when provided '+v );

lib/node_modules/@stdlib/math/base/special/log1mexp/test/test.native.js

@@ -24,7 +24,7 @@ var resolve = require( 'path' ).resolve;
 var tape = require( 'tape' );
 var NINF = require( '@stdlib/constants/float64/ninf' );
 var isnan = require( '@stdlib/math/base/assert/is-nan' );
-var randu = require( '@stdlib/random/base/randu' );
+var uniform = require( '@stdlib/random/base/uniform' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 var abs = require( '@stdlib/math/base/special/abs' );
 var exp = require( '@stdlib/math/base/special/exp' );
@@ -76,31 +76,56 @@ tape( 'if provided `+-0`, the function returns -infinity', opts, function test(
 });
 
 tape( 'the function computes the natural logarithm of `1-exp(-|x|)` (`0 < |x| <= ln(2)`)', opts, function test( t ) {
+	var delta;
+	var rand;
+	var tol;
 	var x;
 	var y;
 	var v;
 	var i;
 
+	rand = uniform.factory( 0.0, LN2, {
+		'seed': 129
+	});
 	for ( i = 0; i < 1e3; i++ ) {
-		v = randu() * LN2;
+		v = rand();
 		x = log1mexp( v );
 		y = ln( -expm1( -v ) );
-		t.strictEqual( x, y, 'returns '+y+' when provided '+v );
+		if ( x === y ) {
+			t.strictEqual( x, y, 'returns '+y+' when provided '+v );
+		} else {
+			delta = abs( x - y );
+			tol = 1.0 * EPS * abs( y );
+			t.ok( delta <= tol, 'within tolerance. v: '+v+'. actual: '+x+'. expected: '+y+'. Δ: '+delta+'. tol: '+tol+'.' );
+		}
 	}
 	t.end();
 });
 
 tape( 'the function computes the natural logarithm of `1-exp(-|x|)` (`x > ln(2)`)', opts, function test( t ) {
+	var delta;
+	var rand;
+	var tol;
 	var x;
 	var y;
 	var v;
 	var i;
 
+	rand = uniform.factory( LN2 + EPS, 100.0, {
+		'seed': 919
+	});
+
 	for ( i = 0; i < 1e3; i++ ) {
-		v = LN2 + EPS + (randu()*100.0);
+		v = rand();
 		x = log1mexp( v );
 		y = log1p( -exp( -v ) );
-		t.strictEqual( x, y, 'returns '+y+' when provided '+v );
+		if ( x === y ) {
+			t.strictEqual( x, y, 'returns '+y+' when provided '+v );
+		} else {
+			delta = abs( x - y );
+			tol = 1.0 * EPS * abs( y );
+			t.ok( delta <= tol, 'within tolerance. v: '+v+'. actual: '+x+'. expected: '+y+'. Δ: '+delta+'. tol: '+tol+'.' );
+		}
 	}
 	t.end();
 });