test: add missing test case

---
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---

Author: headlessNode

lib/node_modules/@stdlib/blas/ext/find-index/lib/main.js

@@ -24,7 +24,6 @@ var hasOwnProp = require( '@stdlib/assert/has-own-property' );
 var isFunction = require( '@stdlib/assert/is-function' );
 var isPlainObject = require( '@stdlib/assert/is-plain-object' );
 var isndarrayLike = require( '@stdlib/assert/is-ndarray-like' );
-var getShape = require( '@stdlib/ndarray/shape' );
 var format = require( '@stdlib/string/format' );
 var base = require( './base.js' );
 
@@ -85,7 +84,6 @@ function findIndex( x ) {
 	var opts;
 	var ctx;
 	var cb;
-	var sh;
 
 	nargs = arguments.length;
 	if ( !isndarrayLike( x ) ) {
@@ -150,11 +148,6 @@ function findIndex( x ) {
 			opts.dtype = options.dtype;
 		}
 	}
-	// Resolve the list of non-reduced dimensions:
-	sh = getShape( x );
-	if ( sh.length < 1 ) {
-		throw new RangeError( 'invalid argument. First argument must have at least one dimension.' );
-	}
 	return base( x, opts, cb, ctx );
 }
 

lib/node_modules/@stdlib/blas/ext/find-index/test/test.main.js

@@ -617,6 +617,31 @@ tape( 'the function supports specifying the operation dimension (column-major)',
 	t.end();
 });
 
+tape( 'the function supports specifying the `keepdims` options property', function test( t ) {
+	var expected;
+	var actual;
+	var xbuf;
+	var opts;
+	var x;
+
+	xbuf = [ -1.0, 2.0, -3.0, 4.0 ];
+	x = new ndarray( 'generic', xbuf, [ 2, 2 ], [ 2, 1 ], 0, 'row-major' );
+	opts = {
+		'keepdims': true
+	};
+
+	actual = findIndex( x, opts, clbk );
+	expected = [ [ 1 ], [ 1 ] ];
+
+	t.strictEqual( isndarrayLike( actual ), true, 'returns expected value' );
+	t.strictEqual( getDType( actual ), 'generic', 'returns expected value' );
+	t.deepEqual( getShape( actual ), [ 2, 1 ], 'returns expected value' );
+	t.strictEqual( getOrder( actual ), getOrder( x ), 'returns expected value' );
+	t.deepEqual( ndarray2array( actual ), expected, 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function supports specifying the output array data type', function test( t ) {
 	var expected;
 	var actual;