test(generator): 89% coverage

src/builder.rs

@@ -1,7 +1,4 @@
-use crate::{
+use crate::{GeneratorType, HexMaze};
-    generator::{generate_backtracking, GeneratorType},
-    HexMaze,
-};
 use hexx::Hex;
 use thiserror::Error;
 
@@ -186,21 +183,14 @@ impl MazeBuilder {
         }
 
         if !maze.is_empty() {
-            self.generate_maze(&mut maze);
+            self.generator_type
+                .generate(&mut maze, self.start_position, self.seed);
         }
 
         Ok(maze)
     }
-
-    fn generate_maze(&self, maze: &mut HexMaze) {
-        match self.generator_type {
-            GeneratorType::RecursiveBacktracking => {
-                generate_backtracking(maze, self.start_position, self.seed);
-            }
-        }
-    }
 }
-fn create_hex_maze(radius: u16) -> HexMaze {
+pub(crate) fn create_hex_maze(radius: u16) -> HexMaze {
     let mut maze = HexMaze::new();
     let radius = i32::from(radius);
 

src/generator.rs

@@ -1,55 +0,0 @@
-#[cfg(feature = "bevy_reflect")]
-use bevy::prelude::*;
-use hexx::{EdgeDirection, Hex};
-use rand::{rngs::StdRng, seq::SliceRandom, thread_rng, Rng, RngCore, SeedableRng};
-use std::collections::HashSet;
-
-use crate::HexMaze;
-
-#[allow(clippy::module_name_repetitions)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-#[cfg_attr(feature = "bevy_reflect", derive(Reflect))]
-#[cfg_attr(feature = "bevy", derive(Component))]
-#[cfg_attr(feature = "bevy", reflect(Component))]
-#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
-pub enum GeneratorType {
-    #[default]
-    RecursiveBacktracking,
-}
-
-pub fn generate_backtracking(maze: &mut HexMaze, start_pos: Option<Hex>, seed: Option<u64>) {
-    if maze.is_empty() {
-        return;
-    }
-
-    let start = start_pos.unwrap_or(Hex::ZERO);
-
-    let mut visited = HashSet::new();
-
-    let mut rng: Box<dyn RngCore> = seed.map_or_else(
-        || Box::new(thread_rng()) as Box<dyn RngCore>,
-        |seed| Box::new(StdRng::seed_from_u64(seed)) as Box<dyn RngCore>,
-    );
-
-    recursive_backtrack(maze, start, &mut visited, &mut rng);
-}
-
-fn recursive_backtrack<R: Rng>(
-    maze: &mut HexMaze,
-    current: Hex,
-    visited: &mut HashSet<Hex>,
-    rng: &mut R,
-) {
-    visited.insert(current);
-    let mut directions = EdgeDirection::ALL_DIRECTIONS;
-    directions.shuffle(rng);
-
-    for direction in directions {
-        let neighbor = current + direction;
-        if maze.get_tile(&neighbor).is_some() && !visited.contains(&neighbor) {
-            maze.remove_tile_wall(&current, direction);
-            maze.remove_tile_wall(&neighbor, direction.const_neg());
-            recursive_backtrack(maze, neighbor, visited, rng);
-        }
-    }
-}

src/generator/backtrack.rs

@@ -0,0 +1,111 @@
+use crate::HexMaze;
+use hexx::{EdgeDirection, Hex};
+use rand::{rngs::StdRng, seq::SliceRandom, thread_rng, Rng, RngCore, SeedableRng};
+use std::collections::HashSet;
+
+pub(super) fn generate_backtracking(maze: &mut HexMaze, start_pos: Option<Hex>, seed: Option<u64>) {
+    if maze.is_empty() {
+        return;
+    }
+
+    let start = start_pos.unwrap_or(Hex::ZERO);
+
+    let mut visited = HashSet::new();
+
+    let mut rng: Box<dyn RngCore> = seed.map_or_else(
+        || Box::new(thread_rng()) as Box<dyn RngCore>,
+        |seed| Box::new(StdRng::seed_from_u64(seed)) as Box<dyn RngCore>,
+    );
+
+    recursive_backtrack(maze, start, &mut visited, &mut rng);
+}
+
+fn recursive_backtrack<R: Rng>(
+    maze: &mut HexMaze,
+    current: Hex,
+    visited: &mut HashSet<Hex>,
+    rng: &mut R,
+) {
+    visited.insert(current);
+    let mut directions = EdgeDirection::ALL_DIRECTIONS;
+    directions.shuffle(rng);
+
+    for direction in directions {
+        let neighbor = current + direction;
+        if maze.get_tile(&neighbor).is_some() && !visited.contains(&neighbor) {
+            maze.remove_tile_wall(&current, direction);
+            maze.remove_tile_wall(&neighbor, direction.const_neg());
+            recursive_backtrack(maze, neighbor, visited, rng);
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use crate::builder::create_hex_maze;
+    use rstest::rstest;
+
+    #[rstest]
+    #[case(Hex::ZERO)]
+    #[case(Hex::new(1, -1))]
+    #[case(Hex::new(-2, 2))]
+    fn recursive_backtrack_start_visited(#[case] start: Hex) {
+        let mut maze = create_hex_maze(3);
+        let mut rng = StdRng::seed_from_u64(12345);
+        let mut visited = HashSet::new();
+
+        recursive_backtrack(&mut maze, start, &mut visited, &mut rng);
+
+        assert!(visited.contains(&start), "Start position should be visited");
+    }
+
+    #[rstest]
+    #[case(Hex::ZERO)]
+    #[case(Hex::new(1, -1))]
+    #[case(Hex::new(-2, 2))]
+    fn recursive_backtrack_walls_removed(#[case] start: Hex) {
+        let mut maze = create_hex_maze(3);
+        let mut rng = StdRng::seed_from_u64(12345);
+        let mut visited = HashSet::new();
+
+        recursive_backtrack(&mut maze, start, &mut visited, &mut rng);
+
+        for &pos in maze.keys() {
+            let walls = maze.get_walls(&pos).unwrap();
+            assert!(
+                walls.count() < 6,
+                "At least one wall should be removed for each tile"
+            );
+        }
+    }
+
+    #[rstest]
+    #[case(Hex::ZERO)]
+    #[case(Hex::new(1, -1))]
+    #[case(Hex::new(-2, 2))]
+    fn recursive_backtrack_connectivity(#[case] start: Hex) {
+        let mut maze = create_hex_maze(3);
+        let mut rng = StdRng::seed_from_u64(12345);
+        let mut visited = HashSet::new();
+
+        recursive_backtrack(&mut maze, start, &mut visited, &mut rng);
+
+        let mut to_visit = vec![start];
+        let mut connected = HashSet::new();
+        while let Some(current) = to_visit.pop() {
+            if !connected.insert(current) {
+                continue;
+            }
+            for dir in EdgeDirection::ALL_DIRECTIONS {
+                let neighbor = current + dir;
+                if let Some(walls) = maze.get_walls(&current) {
+                    if !walls.contains(dir) && maze.get_tile(&neighbor).is_some() {
+                        to_visit.push(neighbor);
+                    }
+                }
+            }
+        }
+        assert_eq!(connected.len(), maze.len(), "All tiles should be connected");
+    }
+}

src/generator/mod.rs

@@ -0,0 +1,24 @@
+mod backtrack;
+use crate::HexMaze;
+use backtrack::generate_backtracking;
+#[cfg(feature = "bevy_reflect")]
+use bevy::prelude::*;
+use hexx::Hex;
+
+#[allow(clippy::module_name_repetitions)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "bevy_reflect", derive(Reflect))]
+#[cfg_attr(feature = "bevy", derive(Component))]
+#[cfg_attr(feature = "bevy", reflect(Component))]
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+pub enum GeneratorType {
+    #[default]
+    RecursiveBacktracking,
+}
+impl GeneratorType {
+    pub fn generate(&self, maze: &mut HexMaze, start_pos: Option<Hex>, seed: Option<u64>) {
+        match self {
+            Self::RecursiveBacktracking => generate_backtracking(maze, start_pos, seed),
+        }
+    }
+}

tests/generator.rs

@@ -0,0 +1,66 @@
+use hexlab::prelude::*;
+use rstest::rstest;
+
+#[rstest]
+#[case(GeneratorType::RecursiveBacktracking, None, None)]
+#[case(GeneratorType::RecursiveBacktracking, Some(Hex::new(1, -1)), None)]
+#[case(GeneratorType::RecursiveBacktracking, None, Some(12345))]
+fn generator_type(
+    #[case] generator: GeneratorType,
+    #[case] start_pos: Option<Hex>,
+    #[case] seed: Option<u64>,
+) {
+    let mut maze = HexMaze::new();
+    for q in -3..=3 {
+        for r in -3..=3 {
+            let hex = Hex::new(q, r);
+            if hex.length() <= 3 {
+                maze.add_tile(hex);
+            }
+        }
+    }
+    let initial_size = maze.len();
+
+    generator.generate(&mut maze, start_pos, seed);
+
+    assert_eq!(maze.len(), initial_size, "Maze size should not change");
+
+    // Check maze connectivity
+    let start = start_pos.unwrap_or(Hex::ZERO);
+    let mut to_visit = vec![start];
+    let mut visited = std::collections::HashSet::new();
+    while let Some(current) = to_visit.pop() {
+        if !visited.insert(current) {
+            continue;
+        }
+        for dir in EdgeDirection::ALL_DIRECTIONS {
+            let neighbor = current + dir;
+            if let Some(walls) = maze.get_walls(&current) {
+                if !walls.contains(dir) && maze.get_tile(&neighbor).is_some() {
+                    to_visit.push(neighbor);
+                }
+            }
+        }
+    }
+    assert_eq!(visited.len(), maze.len(), "All tiles should be connected");
+
+    // Check that each tile has at least one open wall
+    for &pos in maze.keys() {
+        let walls = maze.get_walls(&pos).unwrap();
+        assert!(
+            walls.count() < 6,
+            "Tile at {:?} should have at least one open wall",
+            pos
+        );
+    }
+}
+
+#[test]
+fn test_empty_maze() {
+    let mut maze = HexMaze::new();
+    GeneratorType::RecursiveBacktracking.generate(&mut maze, None, None);
+    assert!(
+        maze.is_empty(),
+        "Empty maze should remain empty after generation"
+    );
+}