test: add initial test file

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/base/unary-reduce-subarray/package.json

@@ -16,7 +16,8 @@
   "main": "./lib",
   "directories": {
     "example": "./examples",
-    "lib": "./lib"
+    "lib": "./lib",
+    "test": "./test"
   },
   "types": "./docs/types",
   "scripts": {},

lib/node_modules/@stdlib/ndarray/base/unary-reduce-subarray/test/test.js

@@ -0,0 +1,35 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2021 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+'use strict';
+
+// MODULES //
+
+var tape = require( 'tape' );
+var reduceSubarray = require( './../lib' );
+
+
+// TESTS //
+
+tape( 'main export is a function', function test( t ) {
+	t.ok( true, __filename );
+	t.strictEqual( typeof reduceSubarray, 'function', 'main export is a function' );
+	t.end();
+});
+
+// FIXME: add tests