test: add negative stride

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---

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/icamax/test/test.ndarray.js

@@ -155,6 +155,27 @@ tape( 'the function supports specifying a stride', function test( t ) {
 	t.end();
 });
 
+tape( 'the function supports specifying a negative stride', function test( t ) {
+	var expected;
+	var idx;
+	var x;
+
+	x = new Complex64Array( [ 3.0, -4.0, 1.0, 15.0, 4.0, 3.0 ] );
+	expected = 1;
+
+	idx = icamax( x.length, x, -1, 2 );
+	t.strictEqual( idx, expected, 'returns expected value' );
+
+	// eslint-disable-next-line max-len
+	x = new Complex64Array( [ 0.1, 4.0, 999.0, 999.0, -0.3, 6.0, 999.0, 999.0, -0.5, 7.0, 999.0, 999.0, -0.1, 3.0 ] );
+	expected = 1;
+
+	idx = icamax( 4, x, -2, 6 );
+	t.strictEqual( idx, expected, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports specifying an `x` offset', function test( t ) {
 	var expected;
 	var idx;