diff --git a/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.js b/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.js
index 3ac91f3eda2a..64107b7cabf0 100644
--- a/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.js
+++ b/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.js
@@ -24,8 +24,7 @@ var tape = require( 'tape' );
 var Complex128Array = require( '@stdlib/array/complex128' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var Float64Array = require( '@stdlib/array/float64' );
-var EPS = require( '@stdlib/constants/float64/eps' );
-var abs = require( '@stdlib/math/base/special/abs' );
+var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
 var zscal = require( './../lib/ndarray.js' );
 
 
@@ -38,22 +37,14 @@ var zscal = require( './../lib/ndarray.js' );
 * @param {Object} t - test object
 * @param {Collection} actual - actual values
 * @param {Collection} expected - expected values
-* @param {number} rtol - relative tolerance
+* @param {NonNegativeInteger} ulp - maximum allowed ULP difference
 */
-function isApprox( t, actual, expected, rtol ) {
-	var delta;
-	var tol;
+function isApprox( t, actual, expected, ulp ) {
 	var i;
 
 	t.strictEqual( actual.length, expected.length, 'returns expected value' );
 	for ( i = 0; i < expected.length; i++ ) {
-		if ( actual[ i ] === expected[ i ] ) {
-			t.strictEqual( actual[ i ], expected[ i ], 'returns expected value' );
-		} else {
-			delta = abs( actual[ i ] - expected[ i ] );
-			tol = rtol * EPS * abs( expected[ i ] );
-			t.ok( delta <= tol, 'within tolerance. actual: '+actual[ i ]+'. expected: '+expected[ i ]+'. delta: '+delta+'. tol: '+tol+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( actual[ i ], expected[ i ], ulp ), true, 'returns expected value' );
 	}
 }
 
@@ -111,7 +102,7 @@ tape( 'the function scales elements from `x` by `alpha`', function test( t ) {
 		3.0
 	]);
 
-	isApprox( t, viewX, expected, 1.0 );
+	isApprox( t, viewX, expected, 1 );
 	t.end();
 });
 
@@ -155,7 +146,7 @@ tape( 'the function supports a `x` stride', function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -199,7 +190,7 @@ tape( 'the function supports a negative `x` stride', function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -243,7 +234,7 @@ tape( 'the function supports a `x` offset', function test( t ) {
 		-4.1   // 3
 	]);
 
-	isApprox( t, viewX, expected, 8.0 );
+	isApprox( t, viewX, expected, 10 );
 	t.end();
 });
 
@@ -326,6 +317,6 @@ tape( 'the function supports complex access patterns', function test( t ) {
 		-0.2  // 2
 	]);
 
-	isApprox( t, viewX, expected, 10.0 );
+	isApprox( t, viewX, expected, 10 );
 	t.end();
 });
diff --git a/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.native.js b/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.native.js
index 78a041e2d7ce..2ce98284cc48 100644
--- a/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.native.js
+++ b/lib/node_modules/@stdlib/blas/base/zscal/test/test.ndarray.native.js
@@ -25,8 +25,7 @@ var tape = require( 'tape' );
 var Complex128Array = require( '@stdlib/array/complex128' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var Float64Array = require( '@stdlib/array/float64' );
-var EPS = require( '@stdlib/constants/float64/eps' );
-var abs = require( '@stdlib/math/base/special/abs' );
+var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 
 
@@ -47,22 +46,14 @@ var opts = {
 * @param {Object} t - test object
 * @param {Collection} actual - actual values
 * @param {Collection} expected - expected values
-* @param {number} rtol - relative tolerance
+* @param {NonNegativeInteger} ulp - maximum allowed ULP difference
 */
-function isApprox( t, actual, expected, rtol ) {
-	var delta;
-	var tol;
+function isApprox( t, actual, expected, ulp ) {
 	var i;
 
 	t.strictEqual( actual.length, expected.length, 'returns expected value' );
 	for ( i = 0; i < expected.length; i++ ) {
-		if ( actual[ i ] === expected[ i ] ) {
-			t.strictEqual( actual[ i ], expected[ i ], 'returns expected value' );
-		} else {
-			delta = abs( actual[ i ] - expected[ i ] );
-			tol = rtol * EPS * abs( expected[ i ] );
-			t.ok( delta <= tol, 'within tolerance. actual: '+actual[ i ]+'. expected: '+expected[ i ]+'. delta: '+delta+'. tol: '+tol+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( actual[ i ], expected[ i ], ulp ), true, 'returns expected value' );
 	}
 }
 
@@ -120,7 +111,7 @@ tape( 'the function scales elements from `x` by `alpha`', opts, function test( t
 		3.0
 	]);
 
-	isApprox( t, viewX, expected, 1.0 );
+	isApprox( t, viewX, expected, 1 );
 	t.end();
 });
 
@@ -164,7 +155,7 @@ tape( 'the function supports a `x` stride', opts, function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -208,7 +199,7 @@ tape( 'the function supports a negative `x` stride', opts, function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -252,7 +243,7 @@ tape( 'the function supports a `x` offset', opts, function test( t ) {
 		-4.1   // 3
 	]);
 
-	isApprox( t, viewX, expected, 8.0 );
+	isApprox( t, viewX, expected, 10 );
 	t.end();
 });
 
@@ -335,6 +326,6 @@ tape( 'the function supports complex access patterns', opts, function test( t )
 		-0.2  // 2
 	]);
 
-	isApprox( t, viewX, expected, 10.0 );
+	isApprox( t, viewX, expected, 10 );
 	t.end();
 });
diff --git a/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.js b/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.js
index da2df09846d6..c80333042958 100644
--- a/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.js
+++ b/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.js
@@ -24,8 +24,7 @@ var tape = require( 'tape' );
 var Complex128Array = require( '@stdlib/array/complex128' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var Float64Array = require( '@stdlib/array/float64' );
-var EPS = require( '@stdlib/constants/float64/eps' );
-var abs = require( '@stdlib/math/base/special/abs' );
+var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
 var zscal = require( './../lib/zscal.js' );
 
 
@@ -38,22 +37,14 @@ var zscal = require( './../lib/zscal.js' );
 * @param {Object} t - test object
 * @param {Collection} actual - actual values
 * @param {Collection} expected - expected values
-* @param {number} rtol - relative tolerance
+* @param {NonNegativeInteger} ulp - maximum allowed ULP difference
 */
-function isApprox( t, actual, expected, rtol ) {
-	var delta;
-	var tol;
+function isApprox( t, actual, expected, ulp ) {
 	var i;
 
 	t.strictEqual( actual.length, expected.length, 'returns expected value' );
 	for ( i = 0; i < expected.length; i++ ) {
-		if ( actual[ i ] === expected[ i ] ) {
-			t.strictEqual( actual[ i ], expected[ i ], 'returns expected value' );
-		} else {
-			delta = abs( actual[ i ] - expected[ i ] );
-			tol = rtol * EPS * abs( expected[ i ] );
-			t.ok( delta <= tol, 'within tolerance. actual: '+actual[ i ]+'. expected: '+expected[ i ]+'. delta: '+delta+'. tol: '+tol+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( actual[ i ], expected[ i ], ulp ), true, 'returns expected value' );
 	}
 }
 
@@ -103,7 +94,7 @@ tape( 'the function scales elements from `x` by `alpha`', function test( t ) {
 		0.08   // 4
 	]);
 
-	isApprox( t, viewX, expected, 1.0 );
+	isApprox( t, viewX, expected, 1 );
 	t.end();
 });
 
@@ -147,7 +138,7 @@ tape( 'the function supports a `x` stride', function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -191,7 +182,7 @@ tape( 'the function supports a negative `x` stride', function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -271,6 +262,6 @@ tape( 'the function supports view offsets', function test( t ) {
 		3.0
 	]);
 
-	isApprox( t, viewX, expected, 1.0 );
+	isApprox( t, viewX, expected, 2 );
 	t.end();
 });
diff --git a/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.native.js b/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.native.js
index fb6ef40b6ab9..dde4a90a3512 100644
--- a/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.native.js
+++ b/lib/node_modules/@stdlib/blas/base/zscal/test/test.zscal.native.js
@@ -25,8 +25,7 @@ var tape = require( 'tape' );
 var Complex128Array = require( '@stdlib/array/complex128' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var Float64Array = require( '@stdlib/array/float64' );
-var EPS = require( '@stdlib/constants/float64/eps' );
-var abs = require( '@stdlib/math/base/special/abs' );
+var isAlmostSameValue = require( '@stdlib/assert/is-almost-same-value' );
 var tryRequire = require( '@stdlib/utils/try-require' );
 
 
@@ -47,22 +46,14 @@ var opts = {
 * @param {Object} t - test object
 * @param {Collection} actual - actual values
 * @param {Collection} expected - expected values
-* @param {number} rtol - relative tolerance
+* @param {NonNegativeInteger} ulp - maximum allowed ULP difference
 */
-function isApprox( t, actual, expected, rtol ) {
-	var delta;
-	var tol;
+function isApprox( t, actual, expected, ulp ) {
 	var i;
 
 	t.strictEqual( actual.length, expected.length, 'returns expected value' );
 	for ( i = 0; i < expected.length; i++ ) {
-		if ( actual[ i ] === expected[ i ] ) {
-			t.strictEqual( actual[ i ], expected[ i ], 'returns expected value' );
-		} else {
-			delta = abs( actual[ i ] - expected[ i ] );
-			tol = rtol * EPS * abs( expected[ i ] );
-			t.ok( delta <= tol, 'within tolerance. actual: '+actual[ i ]+'. expected: '+expected[ i ]+'. delta: '+delta+'. tol: '+tol+'.' );
-		}
+		t.strictEqual( isAlmostSameValue( actual[ i ], expected[ i ], ulp ), true, 'returns expected value' );
 	}
 }
 
@@ -112,7 +103,7 @@ tape( 'the function scales elements from `x` by `alpha`', opts, function test( t
 		0.08   // 4
 	]);
 
-	isApprox( t, viewX, expected, 1.0 );
+	isApprox( t, viewX, expected, 1 );
 	t.end();
 });
 
@@ -156,7 +147,7 @@ tape( 'the function supports a `x` stride', opts, function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -200,7 +191,7 @@ tape( 'the function supports a negative `x` stride', opts, function test( t ) {
 		2.0
 	]);
 
-	isApprox( t, viewX, expected, 5.0 );
+	isApprox( t, viewX, expected, 4 );
 	t.end();
 });
 
@@ -280,6 +271,6 @@ tape( 'the function supports view offsets', opts, function test( t ) {
 		3.0
 	]);
 
-	isApprox( t, viewX, expected, 1.0 );
+	isApprox( t, viewX, expected, 2 );
 	t.end();
 });