Add some tests

Signed-off-by: Šimon Brandner <simon.bra.ag@gmail.com>

src/utils/AnimationUtils.ts

@@ -14,6 +14,8 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+import { clamp } from "lodash";
+
 /**
  * This method linearly interpolates between two points (start, end). This is
  * most commonly used to find a point some fraction of the way along a line
@@ -25,5 +27,6 @@ limitations under the License.
  * @returns
  */
 export function lerp(start: number, end: number, amt: number) {
+    amt = clamp(amt, 0, 1);
     return (1 - amt) * start + amt * end;
 }