/// <summary>
/// Ignore the actual result of a property if the expected value is null
/// </summary>
/// <example>
/// Given the expectation { "a": null }, { "a": "anything" } pass.
/// </example>
public static JsonDiffBuilder UseIgnoreNull(this JsonDiffBuilder builder, JsonDiffPredicate predicate = null)
{
if (builder is null)
{
throw new ArgumentNullException(nameof(builder));
}
return(builder.Use(predicate, (expected, actual, name, diff) =>
expected.Type == JTokenType.Null && actual.Type != JTokenType.Undefined ? (expected, expected) : (expected, actual)));
}
/// <summary>
/// Assert the actual result must not be the expected result if the expected value starts with !
/// </summary>
/// <example>
/// Given the expectation "!value", "a value" pass but "value" fail
/// </example>
public static JsonDiffBuilder UseNegate(this JsonDiffBuilder builder, JsonDiffPredicate predicate = null)
{
if (builder is null)
{
throw new ArgumentNullException(nameof(builder));
}
return(builder.Use(predicate, (expected, actual, name, diff) =>
{
if (expected.Type == JTokenType.String && actual.Type == JTokenType.String &&
expected.Value <string>() is string str && str.StartsWith("!"))
{
if (str.Substring(1) != actual.Value <string>())
{
return (actual, actual);
}
}
return (expected, actual);
}));
public JsonDiffBuilder Use(JsonDiffPredicate match, JsonDiffNormalize normalize)
{
if (normalize is null)
{
throw new ArgumentNullException(nameof(normalize));
}
if (match is null)
{
_rules.Add(normalize);
}
else
{
_rules.Add((expected, actual, name, diff)
=> match(expected, actual, name)
? normalize(expected, actual, name, diff)
: (expected, actual));
}
return(this);
}
