Typo in expected functions: right function name is row:
@ -21,7 +21,7 @@ impl Matrix<T> {
pub fn number_of_rows(&self) -> usize {
}
pub fn rows(&self, n: usize) -> Vec<T> {
pub fn row(&self, n: usize) -> Vec<T> {
pub fn col(&self, n: usize) -> Vec<T> {