src/main/java/org/fest/assertions/error/ShouldContainAtIndex.java
public static ErrorMessageFactory shouldContainAtIndex(Object actual, Object expected, Index index, Object found) {
    return new ShouldContainAtIndex(actual, expected, index, found);
  }
public static ErrorMessageFactory shouldContainAtIndex(Object actual, Object expected, Index index, Object found) {
    return new ShouldContainAtIndex(actual, expected, index, found);
  }
Creates a new </code>{@link ShouldContainAtIndex}</code>.

@param actual the actual value in the failed assertion.
@param expected value expected to be in {@code actual}.
@param index the index of the expected value.
@param found the value in {@code actual} stored under {@code index}.
@return the created {@code ErrorMessageFactory}.