refactor: add sentinel cases

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---

Author: headlessNode

lib/node_modules/@stdlib/ndarray/base/find/test/test.1d.js

@@ -26,6 +26,7 @@ var tape = require( 'tape' );
 var oneTo = require( '@stdlib/array/one-to' );
 var real = require( '@stdlib/complex/float64/real' );
 var imag = require( '@stdlib/complex/float64/imag' );
+var isSameValue = require( '@stdlib/assert/is-same-value' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
 var ndarray = require( '@stdlib/ndarray/ctor' );
@@ -45,47 +46,53 @@ tape( 'the function returns the first element in a 1-dimensional ndarray which p
 	var sv;
 	var x;
 
-	sv = scalar2ndarray( -1.0, {
+	sv = scalar2ndarray( NaN, {
 		'dtype': 'float64'
 	});
-
 	x = ndarray( 'float64', oneTo( 8, 'float64' ), [ 4 ], [ 1 ], 0, 'row-major' );
-	actual = find( [ x, sv ], clbk );
+
+	actual = find( [ x, sv ], clbk1 );
 	t.strictEqual( actual, 2.0, 'returns expected value' );
 
-	x = ndarray( 'float64', oneTo( 8, 'float64' ), [ 4 ], [ 2 ], 0, 'row-major' );
-	actual = find( [ x, sv ], clbk );
-	t.strictEqual( actual, -1.0, 'returns expected value' );
+	actual = find( [ x, sv ], clbk2 );
+	t.strictEqual( isSameValue( actual, NaN ), true, 'returns expected value' );
 
 	t.end();
 
-	function clbk( v ) {
+	function clbk1( v ) {
 		return v % 2.0 === 0.0;
 	}
+
+	function clbk2( v ) {
+		return v < 0.0;
+	}
 });
 
 tape( 'the function returns the first element in a 1-dimensional ndarray which passes a test implemented by a predicate function (accessors)', function test( t ) {
 	var actual;
 	var sv;
 	var x;
 
-	sv = scalar2ndarray( new Complex128( -1.0, 0.0 ), {
+	sv = scalar2ndarray( new Complex128( NaN, NaN ), {
 		'dtype': 'complex128'
 	});
-
 	x = ndarray( 'complex128', oneTo( 8, 'complex128' ), [ 4 ], [ 1 ], 0, 'row-major' );
-	actual = find( [ x, sv ], clbk );
+
+	actual = find( [ x, sv ], clbk1 );
 	t.deepEqual( actual, new Complex128( 2.0, 0.0 ), 'returns expected value' );
 
-	x = ndarray( 'complex128', oneTo( 8, 'complex128' ), [ 4 ], [ 2 ], 0, 'row-major' );
-	actual = find( [ x, sv ], clbk );
-	t.deepEqual( actual, new Complex128( -1.0, 0.0 ), 'returns expected value' );
+	actual = find( [ x, sv ], clbk2 );
+	t.deepEqual( isSameValue( actual, new Complex128( NaN, NaN ) ), true, 'returns expected value' );
 
 	t.end();
 
-	function clbk( v ) {
+	function clbk1( v ) {
 		return real( v ) % 2.0 === 0.0;
 	}
+
+	function clbk2( v ) {
+		return real( v ) < 0.0;
+	}
 });
 
 tape( 'the function supports specifying the callback execution context', function test( t ) {