From dc399c3c49db2861394c7a21f66dae3a44e193f3 Mon Sep 17 00:00:00 2001
From: James Robert Rooke <thepoltergeist23@gmail.com>
Date: Fri, 8 May 2020 10:47:46 +0800
Subject: [PATCH] Animation test (#278)

* animation test

* fix formatting error
---
 .../cursor_renderer/animation_utils.rs        | 138 ++++++++++++++++++
 1 file changed, 138 insertions(+)

diff --git a/src/renderer/cursor_renderer/animation_utils.rs b/src/renderer/cursor_renderer/animation_utils.rs
index 0a410f0..76a6c65 100644
--- a/src/renderer/cursor_renderer/animation_utils.rs
+++ b/src/renderer/cursor_renderer/animation_utils.rs
@@ -79,3 +79,141 @@ pub fn ease_point(ease_func: fn(f32) -> f32, start: Point, end: Point, t: f32) -
         y: ease(ease_func, start.y, end.y, t),
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_lerp() {
+        assert_eq!(lerp(1.0, 0.0, 1.0), 0.0);
+    }
+
+    #[test]
+    fn test_ease_linear() {
+        assert_eq!(ease(ease_linear, 1.0, 0.0, 1.0), 0.0);
+    }
+
+    #[test]
+    fn test_ease_in_quad() {
+        assert_eq!(ease(ease_in_quad, 1.00, 0.0, 1.0), 0.0);
+    }
+
+    #[test]
+    fn test_ease_out_quad() {
+        assert_eq!(ease(ease_out_quad, 1.0, 0.0, 1.0), 0.0);
+    }
+
+    #[test]
+    fn test_ease_in_expo() {
+        assert_eq!(ease(ease_in_expo, 1.0, 0.0, 1.0), 0.0);
+        assert_eq!(ease(ease_in_expo, 1.0, 0.0, 0.0), 1.0);
+    }
+
+    #[test]
+    fn test_ease_out_expo() {
+        assert_eq!(ease(ease_out_expo, 1.0, 0.0, 1.0), 0.0);
+        assert_eq!(ease(ease_out_expo, 1.0, 0.0, 1.1), 0.00048828125);
+    }
+
+    #[test]
+    fn test_ease_in_out_quad() {
+        assert_eq!(ease(ease_in_out_quad, 1.0, 0.0, 1.0), 0.0);
+        assert_eq!(ease(ease_in_out_quad, 1.00, 0.0, 0.4), 0.67999995);
+    }
+
+    #[test]
+    fn test_ease_in_cubic() {
+        assert_eq!(ease(ease_in_cubic, 1.0, 0.0, 1.0), 0.0);
+    }
+
+    #[test]
+    fn test_ease_out_cubic() {
+        assert_eq!(ease(ease_out_cubic, 1.0, 0.0, 1.0), 0.0);
+    }
+
+    #[test]
+    fn test_ease_in_out_cubic() {
+        assert_eq!(ease(ease_in_out_cubic, 1.0, 0.0, 1.0), 0.0);
+        assert_eq!(ease(ease_in_out_cubic, 1.0, 0.0, 0.25), 0.9375);
+    }
+
+    #[test]
+    fn test_ease_point_linear() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        assert_eq!(ease_point(ease_linear, start, end, 1.0), end);
+    }
+
+    #[test]
+    fn test_ease_point_in_quad() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        assert_eq!(ease_point(ease_in_quad, start, end, 1.0), end);
+    }
+
+    #[test]
+    fn test_ease_point_out_quad() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        assert_eq!(ease_point(ease_out_quad, start, end, 1.0), end);
+    }
+
+    #[test]
+    fn test_ease_point_in_out_quad() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        let expected = Point {
+            x: 0.68000007,
+            y: 0.68000007,
+        };
+        assert_eq!(ease_point(ease_in_out_quad, start, end, 1.0), end);
+        assert_eq!(ease_point(ease_in_out_quad, start, end, 1.4), expected);
+    }
+
+    #[test]
+    fn test_ease_point_in_cubic() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        assert_eq!(ease_point(ease_in_cubic, start, end, 1.0), end);
+    }
+
+    #[test]
+    fn test_ease_point_out_cubic() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        assert_eq!(ease_point(ease_out_cubic, start, end, 1.0), end);
+    }
+
+    #[test]
+    fn test_ease_point_in_out_cubic() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        let expected = Point {
+            x: 0.0625,
+            y: 0.0625,
+        };
+        assert_eq!(ease_point(ease_in_out_cubic, start, end, 1.0), end);
+        assert_eq!(ease_point(ease_in_out_cubic, start, end, 0.25), expected);
+    }
+
+    #[test]
+    fn test_ease_point_in_expo() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        assert_eq!(ease_point(ease_in_expo, start, end, 1.0), end);
+        assert_eq!(ease_point(ease_in_expo, start, end, 0.0), start);
+    }
+
+    #[test]
+    fn test_ease_point_out_expo() {
+        let start = Point { x: 0.0, y: 0.0 };
+        let end = Point { x: 1.0, y: 1.0 };
+        let expected = Point {
+            x: 0.9995117,
+            y: 0.9995117,
+        };
+        assert_eq!(ease_point(ease_out_expo, start, end, 1.0), end);
+        assert_eq!(ease_point(ease_out_expo, start, end, 1.1), expected);
+    }
+}