test: add more tests

Author: anandkaranubc

lib/node_modules/@stdlib/math/base/special/gammainc/test/fixtures/cpp/huge.json

@@ -341,10 +341,25 @@ int main( void ) {
 		exit( 1 );
 	}
 
-	// Generate fixture data:
+	// Small x and s:
 	rand_array_f64( x, len, 1.0, 40.0 );
 	rand_array_f64( s, len, 1.0, 40.0 );
-	generate( x, s, len, "output.json" );
+	generate( x, s, len, "small.json" );
+
+	// Medium x and s:
+	rand_array_f64( x, len, 40.0, 100.0 );
+	rand_array_f64( s, len, 40.0, 100.0 );
+	generate( x, s, len, "medium.json" );
+
+	// Large x and small s:
+	rand_array_f64( x, len, 100.0, 1000.0 );
+	rand_array_f64( s, len, 1.0, 50.0 );
+	generate( x, s, len, "large.json" );
+
+	// Large x and medium s:
+	rand_array_f64( x, len, 100.0, 1000.0 );
+	rand_array_f64( s, len, 50.0, 100.0 );
+	generate( x, s, len, "huge.json" );
 
 	// Free allocated memory:
 	free( x );