Merge pull request #31 from mod-cpp/olafurw/fruit_tests

Adding unit tests for fruits. Also some minor cleanup.

lib/Canvas.cpp

@@ -107,13 +107,15 @@ void Canvas::renderFruits(const Fruits & fruit, int eatenFruits) {
     const auto & pos = fruit.position();
     renderSprite(sprite, pos);
   }
+
   const auto x = static_cast<size_t>(LEFT_MARGIN + TARGET_MAZE_WIDTH + LEFT_MARGIN);
   const auto y = static_cast<size_t>((TARGET_MAZE_HEIGHT / 3.0) * 2);
 
   for (auto i = 0; i < eatenFruits + 1; i++) {
-    auto sprite_position = float(i) * SPRITE_WIDTH * 1.5f;
-    sf::Vector2f pos{ x + sprite_position, y };
+    const auto sprite_position = float(i) * SPRITE_WIDTH * 1.5f;
+    const sf::Vector2f pos{ x + sprite_position, y };
     sprite.setPosition(pos.x, pos.y);
+
     window.draw(sprite);
   }
 }

lib/Fruits.cpp

@@ -4,50 +4,50 @@
 namespace pacman {
 
 void Fruits::update(std::chrono::milliseconds time_delta, const GameState & gameState) {
-    if(visible) {
-        time_visible += time_delta;
-    }
+  if (visible) {
+    time_visible += time_delta;
+  }
 
-    if(time_visible > std::chrono::seconds(9)) {
-        hide();
-    }
-
-    // Two times the same fruit for each level, after 70 and 170 pellets eaten
-    else if ((index == 0 && gameState.score.eatenPellets >= 70)
-          || (index == 1 && gameState.score.eatenPellets >= 170)) {
-        visible = true;
-    }
+  if (time_visible > std::chrono::seconds(9)) {
+    hide();
+  } else if ((index == 0 && gameState.score.eatenPellets >= 70) || (index == 1 && gameState.score.eatenPellets >= 170)) {
+    // We show the fruit twice, once at 70 pellets and once at 170
+    visible = true;
+  }
 }
 
 GridPosition Fruits::currentSprite() const {
-    // That's the cherry
-    return {3, 8};
+  // That's the cherry
+  return { 3, 8 };
 }
 
 Position Fruits::position() const {
-    // under the pen
-    return {13.5, 17};
+  // under the pen
+  return { 13.5, 17 };
 }
 
 bool Fruits::isVisible() const {
-    return visible;
+  return visible;
 }
 
 int Fruits::value() const {
-    // The cherry is worth 100
-    return 100;
+  // The cherry is worth 100
+  return 100;
 }
 
 int Fruits::eat() {
-    hide();
-    return value();
+  if (!isVisible()) {
+    return 0;
+  }
+
+  hide();
+  return value();
 }
 
 void Fruits::hide() {
-    index++;
-    time_visible = std::chrono::seconds{0};
-    visible = false;
+  index++;
+  time_visible = std::chrono::seconds{ 0 };
+  visible = false;
 }
 
-
-}
+} // namespace pacman

lib/include/Fruits.hpp

@@ -9,17 +9,20 @@ struct GameState;
 class Fruits {
 public:
   void update(std::chrono::milliseconds time_delta, const GameState & gameState);
+
   GridPosition currentSprite() const;
   Position position() const;
+
   bool isVisible() const;
   int value() const;
   int eat();
 
 private:
-  void hide();
   bool visible = false;
   int index = 0;
   std::chrono::milliseconds time_visible{ 0 };
+
+  void hide();
 };
 
 } // namespace pacman

test/testFruits.cpp

@@ -0,0 +1,77 @@
+#include "Fruits.hpp"
+#include "GameState.hpp"
+#include <catch2/catch.hpp>
+
+TEST_CASE("Fruit default initialization", "[fruits]") {
+  pacman::Fruits fruit;
+  REQUIRE_FALSE(fruit.isVisible());
+  REQUIRE(fruit.value() == 100);
+  REQUIRE(fruit.currentSprite().x == 3);
+  REQUIRE(fruit.currentSprite().y == 8);
+  REQUIRE(fruit.position().x == Approx(13.5));
+  REQUIRE(fruit.position().y == Approx(17));
+}
+
+TEST_CASE("Fruit Visibility", "[fruits]") {
+  pacman::GameState gameState;
+  REQUIRE_FALSE(gameState.fruit.isVisible());
+
+  SECTION("9 seconds but no pellets eaten") {
+    gameState.fruit.update(std::chrono::milliseconds(9001), gameState);
+    REQUIRE_FALSE(gameState.fruit.isVisible());
+  }
+
+  SECTION("9 seconds and 70 pellets eaten") {
+    // "Eat 70 pellets", do an update and check the state
+    gameState.score.eatenPellets = 70;
+    gameState.fruit.update(std::chrono::milliseconds(1), gameState);
+    REQUIRE(gameState.fruit.isVisible());
+
+    // Wait more than 9 seconds and then check the state again
+    gameState.fruit.update(std::chrono::milliseconds(9001), gameState);
+    REQUIRE_FALSE(gameState.fruit.isVisible());
+  }
+
+  SECTION("70 and 170 pellets eaten") {
+    // "Eat 70 pellets", do an update and check the state
+    gameState.score.eatenPellets = 70;
+    gameState.fruit.update(std::chrono::milliseconds(1), gameState);
+    REQUIRE(gameState.fruit.isVisible());
+
+    // Wait more than 9 seconds and then check the state again
+    gameState.fruit.update(std::chrono::milliseconds(9001), gameState);
+    REQUIRE_FALSE(gameState.fruit.isVisible());
+
+    // "Eat 170 pellets", do an update and check the state
+    gameState.score.eatenPellets = 170;
+    gameState.fruit.update(std::chrono::milliseconds(1), gameState);
+    REQUIRE(gameState.fruit.isVisible());
+
+    // Wait more than 9 seconds and then check the state again
+    gameState.fruit.update(std::chrono::milliseconds(9001), gameState);
+    REQUIRE_FALSE(gameState.fruit.isVisible());
+
+    // We should never get a visible state again, since we only show 2 fruits
+    gameState.score.eatenPellets = 1000;
+    gameState.fruit.update(std::chrono::milliseconds(1), gameState);
+    REQUIRE_FALSE(gameState.fruit.isVisible());
+
+    // Wait more than 9 seconds and then check the state again
+    gameState.fruit.update(std::chrono::milliseconds(9001), gameState);
+    REQUIRE_FALSE(gameState.fruit.isVisible());
+  }
+
+  SECTION("Eating a fruit") {
+    REQUIRE(gameState.fruit.eat() == 0);
+
+    gameState.score.eatenPellets = 70;
+    gameState.fruit.update(std::chrono::milliseconds(1), gameState);
+    REQUIRE(gameState.fruit.isVisible());
+    REQUIRE(gameState.fruit.eat() == gameState.fruit.value());
+
+    // Wait more than 9 seconds and then check the state again
+    gameState.fruit.update(std::chrono::milliseconds(9001), gameState);
+    REQUIRE_FALSE(gameState.fruit.isVisible());
+    REQUIRE(gameState.fruit.eat() == 0);
+  }
+}