test: add test cases

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---

Author: kgryte

lib/node_modules/@stdlib/array/base/banded/filled2d-by/test/test.js

@@ -53,6 +53,14 @@ tape( 'the function returns a filled banded nested array', function test( t ) {
 	actual = filled2dBy( [ 3, 3 ], 0, 0, -1, clbk );
 	t.deepEqual( actual, expected, 'returns expected value' );
 
+	expected = [ [ 0, 1, -1 ], [ -1, 2, 3 ], [ -1, -1, 4 ] ];
+	actual = filled2dBy( [ 3, 3 ], 1, 0, -1, clbk );
+	t.deepEqual( actual, expected, 'returns expected value' );
+
+	expected = [ [ 0, -1, -1 ], [ 1, 2, -1 ], [ -1, 3, 4 ] ];
+	actual = filled2dBy( [ 3, 3 ], 0, 1, -1, clbk );
+	t.deepEqual( actual, expected, 'returns expected value' );
+
 	expected = [ [ 0, 1, 2 ], [ 1, 2, 3 ], [ 2, 3, 4 ], [ -1, 4, 5 ] ];
 	actual = filled2dBy( [ 4, 3 ], 2, 2, -1, clbk );
 	t.deepEqual( actual, expected, 'returns expected value' );