Add test

src/lib.rs

@@ -123,6 +123,29 @@ impl Universe {
     pub fn cells(&self) -> *const Cell {
         self.cells.as_ptr()
     }
+
+    pub fn set_width(&mut self, width: u32) {
+        self.width = width;
+        self.cells = (0..width * self.height).map(|_i| Cell::Dead).collect();
+    }
+
+    pub fn set_height(&mut self, height: u32) {
+        self.height = height;
+        self.cells = (0..height * self.height).map(|_i| Cell::Dead).collect();
+    }
+}
+
+impl Universe {
+    pub fn get_cells(&self) -> &[Cell] {
+        &self.cells
+    }
+
+    pub fn set_cells(&mut self, cells: &[(u32, u32)]) {
+        for (row, col) in cells.iter().cloned() {
+            let idx = self.get_index(row, col);
+            self.cells[idx] = Cell::Alive;
+        }
+    }
 }
 
 impl Default for Universe {

tests/web.rs

@@ -0,0 +1,47 @@
+//! Test suite for the Web and headless browsers.
+
+#![cfg(target_arch = "wasm32")]
+
+extern crate wasm_bindgen_test;
+use wasm_bindgen_test::*;
+
+use wasm_game_of_life::Universe;
+
+wasm_bindgen_test_configure!(run_in_browser);
+
+#[wasm_bindgen_test]
+fn pass() {
+    assert_eq!(1 + 1, 2);
+}
+
+#[cfg(test)]
+pub fn input_spaceship() -> Universe {
+    let mut universe = Universe::new();
+    universe.set_width(6);
+    universe.set_height(6);
+    universe.set_cells(&[(1, 2), (2, 3), (3, 1), (3, 2), (3, 3)]);
+    universe
+}
+
+#[cfg(test)]
+pub fn expected_spaceship() -> Universe {
+    let mut universe = Universe::new();
+    universe.set_width(6);
+    universe.set_height(6);
+    universe.set_cells(&[(2, 1), (2, 3), (3, 2), (3, 3), (4, 2)]);
+    universe
+}
+
+#[wasm_bindgen_test]
+pub fn test_tick() {
+    // Let's create a smaller Universe with a small spaceship to test!
+    let mut input_universe = input_spaceship();
+
+    // This is what our spaceship should look like
+    // after one tick in our universe.
+    let expected_universe = expected_spaceship();
+
+    // Call `tick` and then see if the cells in the `Universe`s are the same.
+    input_universe.tick();
+    assert_eq!(&input_universe.get_cells(), &expected_universe.get_cells());
+}