C#字符串插值传递值

我在类中有这个只读字符串:

public static class XssProtectionConstants {
    /// 

    /// {0} specifies the report url, including protocol
    /// 
    public static readonly string Report = "1; report={0}";
}

我想访问它并传入一个值,使它现在等于 "1; report=www.reportMyErrors.com"

这是为了这个单元测试断言:

Assert.AreEqual(_policyValue, XssProtectionConstants.Report );

这个抛出:

Expected:<1; report=www.reportMyErrors.com>. Actual:<1; report={0}>. www.reportMyErrors.com

如何更新我的断言以使其平等"1; report=www.reportMyErrors.com>"？

Assert.AreEqual(_policyValue, string.Format(XssProtectionConstants.Report,"www.reportMyErrors.com" ) );