update the test case

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---

Author: jalajk3004

lib/node_modules/@stdlib/stats/incr/nanrange/test/test.js

@@ -54,41 +54,39 @@ tape( 'the accumulator function incrementally computes a range while ignoring Na
 	var d;
 	var i;
 
-	data = [ 2.0, 3.0, NaN, 2.0, 4.0, NaN, 3.0, 4.0 ];
+	data = [ 2.0, NaN, 3.0, NaN, 4.0, 43.0, NaN, 4.0 ];
 	N = data.length;
 
-	expected = new Array( N );
-	actual = new Array( N );
+	expected = [];
+	actual = [];
 
 	acc = incrnanrange();
 
 	max = null;
 	min = null;
 	for ( i = 0; i < N; i++ ) {
 		d = data[ i ];
-		if ( isnan( d ) === false ) {
+		if ( !isnan( d ) ) {
 			if ( max === null || d > max ) {
 				max = d;
 			}
 			if ( min === null || d < min ) {
 				min = d;
 			}
-			expected[ i ] = max - min;
-		} else {
-			expected[ i ] = expected[i-1];
 		}
-		actual[ i ] = acc( d );
+		expected.push( max !== null && min !== null ? max - min : null );
+		actual.push( acc( d ) );
 	}
 	t.deepEqual( actual, expected, 'returns expected incremental results' );
 	t.end();
 });
 
-tape( 'if not provided an input value, the accumulator function returns the current range', function test( t ) {
+tape( 'if not provided an input value, the accumulator function returns the current range while ignoring the NaN value', function test( t ) {
 	var data;
 	var acc;
 	var i;
 
-	data = [ -2.0, NaN, 3.0, 1.0, NaN ];
+	data = [ NaN, -2.0, NaN, 3.0, 1.0 ];
 	acc = incrnanrange();
 	for ( i = 0; i < data.length; i++ ) {
 		acc( data[ i ] );
@@ -107,6 +105,20 @@ tape( 'if provided a `NaN`, the accumulator function returns `NaN` for all futur
 	for ( i = 0; i < data.length; i++ ) {
 		acc( data[ i ] );
 	}
-	t.equal( isnan( acc() ), true, 'returns expected value' );
+	t.equal( isnan( acc() ), false, 'returns expected value' );
+	t.end();
+});
+
+tape( 'if all provided values are `NaN`, the accumulator function returns `null`', function test( t ) {
+	var data;
+	var acc;
+	var i;
+
+	data = [ NaN, NaN, NaN ];
+	acc = incrnanrange();
+	for ( i = 0; i < data.length; i++ ) {
+		acc( data[ i ] );
+	}
+	t.equal( acc(), null, 'returns null' );
 	t.end();
 });