chore: add test cases

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---

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/dsbmv/test/fixtures/column_major_complex_access_pattern.json

@@ -4,7 +4,7 @@
   "N": 3,
   "K": 1,
   "alpha": 1.0,
-  "beta": 1.0,
+  "beta": 2.0,
   "strideX": -2,
   "offsetX": 4,
   "strideY": -3,
@@ -21,5 +21,5 @@
   "strideA1": 3,
   "strideA2": 2,
   "offsetA": 3,
-  "y_out": [ 8.0, 0.0, 0.0, 4.0, 0.0, 0.0, 5.0 ]
+  "y_out": [ 9.0, 0.0, 0.0, 5.0, 0.0, 0.0, 6.0 ]
 }

lib/node_modules/@stdlib/blas/base/dsbmv/test/fixtures/row_major_complex_access_pattern.json

@@ -4,7 +4,7 @@
   "N": 3,
   "K": 1,
   "alpha": 1.0,
-  "beta": 1.0,
+  "beta": 2.0,
   "strideX": -2,
   "offsetX": 4,
   "strideY": -3,
@@ -21,5 +21,5 @@
   "strideA1": 2,
   "strideA2": 3,
   "offsetA": 3,
-  "y_out": [ 12.0, 0.0, 0.0, 9.0, 0.0, 0.0, 2.0 ]
+  "y_out": [ 13.0, 0.0, 0.0, 10.0, 0.0, 0.0, 3.0 ]
 }

lib/node_modules/@stdlib/blas/base/dsbmv/test/test.ndarray.js

@@ -109,7 +109,29 @@ tape( 'the function throws an error if provided an invalid second argument', fun
 
 	function badValue( value ) {
 		return function badValue() {
-			dsbmv( rl.uplo, value, rl.alpha, new Float64Array( rl.A ), rl.strideA1, rl.strideA2, rl.offsetA, new Float64Array( rl.x ), rl.strideX, rl.offsetX, rl.beta, new Float64Array( rl.y ), rl.strideY, rl.offsetY );
+			dsbmv( rl.uplo, value, rl.K, rl.alpha, new Float64Array( rl.A ), rl.strideA1, rl.strideA2, rl.offsetA, new Float64Array( rl.x ), rl.strideX, rl.offsetX, rl.beta, new Float64Array( rl.y ), rl.strideY, rl.offsetY );
+		};
+	}
+});
+
+tape( 'the function throws an error if provided an invalid third argument', function test( t ) {
+	var values;
+	var i;
+
+	values = [
+		-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() {
+			dsbmv( rl.uplo, value, value, rl.alpha, new Float64Array( rl.A ), rl.strideA1, rl.strideA2, rl.offsetA, new Float64Array( rl.x ), rl.strideX, rl.offsetX, rl.beta, new Float64Array( rl.y ), rl.strideY, rl.offsetY );
 		};
 	}
 });