test: pass in opts to skip if addon is not available

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---

Author: Planeshifter

lib/node_modules/@stdlib/stats/base/dists/rayleigh/stdev/test/test.native.js

@@ -37,23 +37,26 @@ var data = require( './fixtures/julia/data.json' );
 // VARIABLES //
 
 var stdev = tryRequire( resolve( __dirname, './../lib/native.js' ) );
+var opts = {
+	'skip': ( stdev instanceof Error )
+};
 
 
 // TESTS //
 
-tape( 'main export is a function', function test( t ) {
+tape( 'main export is a function', opts, function test( t ) {
 	t.ok( true, __filename );
 	t.strictEqual( typeof stdev, 'function', 'main export is a function' );
 	t.end();
 });
 
-tape( 'if provided `NaN` for `sigma`, the function returns `NaN`', function test( t ) {
+tape( 'if provided `NaN` for `sigma`, the function returns `NaN`', opts, function test( t ) {
 	var sigma = stdev( NaN );
 	t.equal( isnan( sigma ), true, 'returns NaN' );
 	t.end();
 });
 
-tape( 'if provided a scale `sigma` that is not a nonnegative number, the function returns `NaN`', function test( t ) {
+tape( 'if provided a scale `sigma` that is not a nonnegative number, the function returns `NaN`', opts, function test( t ) {
 	var sigma;
 
 	sigma = stdev( -1.0 );
@@ -65,7 +68,7 @@ tape( 'if provided a scale `sigma` that is not a nonnegative number, the functio
 	t.end();
 });
 
-tape( 'the function returns the standard deviation of a Rayleigh distribution', function test( t ) {
+tape( 'the function returns the standard deviation of a Rayleigh distribution', opts, function test( t ) {
 	var expected;
 	var delta;
 	var sigma;