function check(assert, sExpression, vResult, oScope) {
		var oInvisibleText = new InvisibleText({
				text: sExpression[0] === "{" ? sExpression : "{=" + sExpression + "}",
				models: oModel
			}, oScope);

		oInvisibleText.bindObject("/");
		assert.strictEqual(oInvisibleText.getText(),
			oInvisibleText.validateProperty("text", vResult));

		oInvisibleText.destroy();
	}
Checks the string result of an expression binding when bound to a control property of type
string.

@param {object} assert the assertions
@param {string} sExpression - the expression or the expression binding in {=... syntax
@param {any} vResult - the expected result before automatic conversion
@param {object} [oScope] - the object to resolve formatter functions in the control