test: add tests for a fromIndex ndarray

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---

Author: kgryte

lib/node_modules/@stdlib/blas/ext/index-of/test/test.assign.js

@@ -26,6 +26,7 @@ var ndarray = require( '@stdlib/ndarray/ctor' );
 var zeros = require( '@stdlib/ndarray/zeros' );
 var ndarray2array = require( '@stdlib/ndarray/to-array' );
 var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
+var Int32Array = require( '@stdlib/array/int32' );
 var getDType = require( '@stdlib/ndarray/dtype' );
 var getShape = require( '@stdlib/ndarray/shape' );
 var getOrder = require( '@stdlib/ndarray/order' );
@@ -1155,7 +1156,7 @@ tape( 'the function returns the first index of a specified search element in an
 	t.end();
 });
 
-tape( 'the function supports specifying operation dimensions (row-major)', function test( t ) {
+tape( 'the function supports specifying an operation dimension (row-major)', function test( t ) {
 	var expected;
 	var actual;
 	var xbuf;
@@ -1680,3 +1681,44 @@ tape( 'the function supports providing a from index (0d ndarray, broadcasted)',
 
 	t.end();
 });
+
+tape( 'the function supports providing a from index (ndarray)', function test( t ) {
+	var searchElement;
+	var expected;
+	var fromIdx;
+	var actual;
+	var xbuf;
+	var x;
+	var y;
+
+	/*
+	* [
+	*     1.0, -2.0,
+	*     2.0, -3.0,
+	*     3.0, -4.0,
+	*     2.0, -3.0,
+	*     5.0, -6.0
+	* ]
+	*/
+	xbuf = [ 1.0, -2.0, 2.0, -3.0, 3.0, -4.0, 2.0, -3.0, 5.0, -6.0 ];
+	x = new ndarray( 'generic', xbuf, [ 5, 2 ], [ 2, 1 ], 0, 'row-major' );
+	y = zeros( [ 2 ], {
+		'dtype': 'generic'
+	});
+
+	fromIdx = new ndarray( 'int32', new Int32Array( [ 2, 2 ] ), [ 2 ], [ 1 ], 0, 'row-major' );
+	searchElement = new ndarray( 'generic', [ 2.0, -3.0 ], [ 2 ], [ 1 ], 0, 'row-major' );
+	actual = indexOf( x, searchElement, fromIdx, y, {
+		'dim': 0
+	});
+	expected = [ 3, 3 ];
+
+	t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+	t.strictEqual( getDType( actual ), 'generic', 'returns expected value' );
+	t.deepEqual( getShape( actual ), [ 2 ], 'returns expected value' );
+	t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+	t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+	t.strictEqual( ( y === actual ), true, 'returns expected value' );
+
+	t.end();
+});