chore: add test cases

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---

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/dgemv/test/test.dgemv.native.js

@@ -169,6 +169,33 @@ tape( 'the function throws an error if provided an invalid fourth argument', opt
 	}
 });
 
+tape( 'the function throws an error if provided an invalid seventh argument', opts, function test( t ) {
+	var values;
+	var data;
+	var i;
+
+	data = rnt;
+
+	values = [
+		1,
+		0,
+		-1,
+		-2,
+		-3
+	];
+
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), RangeError, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			dgemv( data.order, data.trans, data.M, data.N, data.alpha, new Float64Array( data.A ), value, new Float64Array( data.x ), data.strideX, data.beta, new Float64Array( data.y ), data.strideY );
+		};
+	}
+});
+
 tape( 'the function throws an error if provided an invalid ninth argument', opts, function test( t ) {
 	var values;
 	var data;