test: guard against edge case

This commit guards against the scenario where a PRNG generates a
zero during random value generation. This happened during a test
run of `discrete-uniform`. While not likely for continuous distributions,
we go ahead and set the original array element to `NaN`, which should
never be generated unless a PRNG is misconfigured.

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---

Author: kgryte

lib/node_modules/@stdlib/random/scripts/scaffolds/binary/data/test/test__assign__js.txt

@@ -134,9 +134,13 @@ tape( 'the `assign` method fills an ndarray with pseudorandom numbers (scalar)',
 	out = zeros( [ 3, 3 ], {
 		'dtype': 'float64'
 	});
+	out.set( 0, 0, NaN );
+
 	original = zeros( [ 3, 3 ], {
 		'dtype': 'float64'
 	});
+	original.set( 0, 0, NaN );
+
 	actual = random.assign( PARAM1, PARAM2, out );
 
 	t.strictEqual( out, actual, 'returns expected value' );
@@ -157,9 +161,12 @@ tape( 'the `assign` method fills an ndarray with pseudorandom numbers (zero-dime
 	out = zeros( [ 3, 3 ], {
 		'dtype': 'float64'
 	});
+	out.set( 0, 0, NaN );
+
 	original = zeros( [ 3, 3 ], {
 		'dtype': 'float64'
 	});
+	original.set( 0, 0, NaN );
 
 	actual = random.assign( param1, param2, out );
 
@@ -182,9 +189,12 @@ tape( 'the `assign` method fills an ndarray with pseudorandom numbers (ndarray)'
 	out = zeros( [ 2, 2 ], {
 		'dtype': 'float64'
 	});
+	out.set( 0, 0, NaN );
+
 	original = zeros( [ 2, 2 ], {
 		'dtype': 'float64'
 	});
+	original.set( 0, 0, NaN );
 
 	actual = random.assign( param1, param2, out );
 
@@ -207,9 +217,12 @@ tape( 'the `assign` method fills an ndarray with pseudorandom numbers (broadcast
 	out = zeros( [ 2, 2 ], {
 		'dtype': 'float64'
 	});
+	out.set( 0, 0, NaN );
+
 	original = zeros( [ 2, 2 ], {
 		'dtype': 'float64'
 	});
+	original.set( 0, 0, NaN );
 
 	actual = random.assign( param1, param2, out );
 
@@ -227,9 +240,12 @@ tape( 'the `assign` method supports filling a zero-dimensional ndarray (scalar)'
 	out = zeros( [], {
 		'dtype': 'float64'
 	});
+	out.set( NaN );
+
 	original = zeros( [], {
 		'dtype': 'float64'
 	});
+	original.set( NaN );
 
 	actual = random.assign( PARAM1, PARAM2, out );
 
@@ -251,9 +267,12 @@ tape( 'the `assign` method supports filling a zero-dimensional ndarray (ndarray)
 	out = zeros( [], {
 		'dtype': 'float64'
 	});
+	out.set( NaN );
+
 	original = zeros( [], {
 		'dtype': 'float64'
 	});
+	original.set( NaN );
 
 	actual = random.assign( param1, param2, out );