Address PR feedback: add tests
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@ -12,24 +12,42 @@
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// Step 1: use a `Box` in the enum definition to make the code compile
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// Step 1: use a `Box` in the enum definition to make the code compile
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// Step 2: create both empty and non-empty cons lists of by replacing `unimplemented!()`
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// Step 2: create both empty and non-empty cons lists of by replacing `unimplemented!()`
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//
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//
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// Note: the tests should not be changed
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//
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// Execute `rustlings hint box1` for hints :)
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// Execute `rustlings hint box1` for hints :)
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// I AM NOT DONE
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// I AM NOT DONE
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#[derive(PartialEq, Debug)]
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#[derive(PartialEq, Debug)]
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enum List {
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pub enum List {
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Cons(i32, List),
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Cons(i32, List),
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Nil,
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Nil,
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}
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}
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fn main() {
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fn main() {
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let empty_list = unimplemented!();
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println!("This is an empty cons list: {:?}", create_empty_list());
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println!("This is an empty cons list: {:?}", empty_list);
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println!("This is a non-empty cons list: {:?}", create_non_empty_list());
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}
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let non_empty_list = unimplemented!();
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println!("This is a non-empty cons list: {:?}", non_empty_list);
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pub fn create_empty_list() -> List {
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unimplemented!()
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// Do not change these
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}
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assert_eq!(List::Nil, empty_list);
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assert_ne!(empty_list, non_empty_list);
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pub fn create_non_empty_list() -> List {
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unimplemented!()
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_create_empty_list() {
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assert_eq!(List::Nil, create_empty_list())
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}
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#[test]
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fn test_create_non_empty_list() {
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assert_ne!(create_empty_list(), create_non_empty_list())
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}
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}
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}
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@ -617,17 +617,17 @@ hint = """
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[[exercises]]
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[[exercises]]
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name = "box1"
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name = "box1"
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path = "exercises/standard_library_types/box1.rs"
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path = "exercises/standard_library_types/box1.rs"
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mode = "compile"
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mode = "test"
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hint = """
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hint = """
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Step 1
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Step 1
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The compiler's message should help: since we cannot store the value of the actual type
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The compiler's message should help: since we cannot store the value of the actual type
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when working with recursive types, we need to store a reference (pointer) to its value.
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when working with recursive types, we need to store a reference (pointer) to its value.
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We should therefore place our `List` inside a `Box`. More details in the book here:
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We should, therefore, place our `List` inside a `Box`. More details in the book here:
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https://doc.rust-lang.org/book/ch15-01-box.html#enabling-recursive-types-with-boxes
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https://doc.rust-lang.org/book/ch15-01-box.html#enabling-recursive-types-with-boxes
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Step 2
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Step 2
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Creating an empty list should be fairly straightforward (hint: peek at the assertions).
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Creating an empty list should be fairly straightforward (hint: peek at the assertions).
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For a non-empty list keep in mind that wee want to use our Cons "list builder".
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For a non-empty list keep in mind that we want to use our Cons "list builder".
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Although the current list is one of integers (i32), feel free to change the definition
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Although the current list is one of integers (i32), feel free to change the definition
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and try other types!
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and try other types!
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"""
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"""
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