test: add test cases for blas/base/dsyr2

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---

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/dsyr2/lib/ndarray.js

@@ -72,6 +72,12 @@ function dsyr2( uplo, N, alpha, x, strideX, offsetX, y, strideY, offsetY, A, str
 	if ( strideY === 0 ) {
 		throw new RangeError( format( 'invalid argument. Eighth argument must be non-zero. Value: `%d`.', strideY ) );
 	}
+	if ( strideA1 === 0 ) {
+		throw new RangeError( format( 'invalid argument. Eleventh argument must be non-zero. Value: `%d`.', strideA1 ) );
+	}
+	if ( strideA2 === 0 ) {
+		throw new RangeError( format( 'invalid argument. Twelfth argument must be non-zero. Value: `%d`.', strideA2 ) );
+	}
 	if ( N === 0 || alpha === 0.0 ) {
 		return A;
 	}

lib/node_modules/@stdlib/blas/base/dsyr2/test/test.ndarray.js

@@ -168,6 +168,52 @@ tape( 'the function throws an error if provided an invalid eighth argument', fun
 	}
 });
 
+tape( 'the function throws an error if provided an invalid eleventh argument', function test( t ) {
+	var values;
+	var data;
+	var i;
+
+	data = ru;
+
+	values = [
+		0
+	];
+
+	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() {
+			dsyr2( data.uplo, data.N, data.alpha, new Float64Array( data.x ), data.strideX, data.offsetX, new Float64Array( data.y ), data.strideY, data.offsetY, new Float64Array( data.A ), value, data.strideA2, data.offsetA );
+		};
+	}
+});
+
+tape( 'the function throws an error if provided an invalid twelfth argument', function test( t ) {
+	var values;
+	var data;
+	var i;
+
+	data = ru;
+
+	values = [
+		0
+	];
+
+	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() {
+			dsyr2( data.uplo, data.N, data.alpha, new Float64Array( data.x ), data.strideX, data.offsetX, new Float64Array( data.y ), data.strideY, data.offsetY, new Float64Array( data.A ), data.strideA1, value, data.offsetA );
+		};
+	}
+});
+
 tape( 'the function performs the symmetric rank 2 operation `A = α*x*y^T + α*y*x^T + A` (row-major, upper)', function test( t ) {
 	var expected;
 	var data;