isTrue static method
Validate that the argument condition is [true] otherwise throwing an exception with the specified message. This method is useful when validating according to an arbitrary boolean expression, such as validating a primitive number or using your own custom validation expression.
Validate.isTrue(i > 0.0, "The value must be greater than zero: $value");
expression
the boolean expression to check
message
the exception message if invalid, not null
Throws ArgumentError if expression is false
Implementation
static bool isTrue(final bool expression,
[final String message = DEFAULT_IS_TRUE_EX_MESSAGE]) =>
expect.isTrue(expression, message: () => message);