lib/subject/mapSubject.js
function KeyValue(subject, key) {
  this.subject = subject;
  this.key = key;
  this.format = subject.format;
  this.value = subject.value.get(key);
}
function KeyValue(subject, key) {
  this.subject = subject;
  this.key = key;
  this.format = subject.format;
  this.value = subject.value.get(key);
}
function KeyValue ( subject , key ) { this . subject = subject ; this . key = key ; this . format = subject . format ; this . value = subject . value . get ( key ) ; }
A fluent context object containing the value of the field that was just tested. Used for
additional assertions about a field.
@constructor
A fluent context object containing the value of the field that was just tested . Used for additional assertions about a field .