diff --git a/tests/collision.py b/tests/collision.py
new file mode 100644
index 0000000..483039f
--- /dev/null
+++ b/tests/collision.py
@@ -0,0 +1,41 @@
+import sys
+sys.path.insert(0, '.')
+import play
+import pytest
+
+radius = 20
+x_speed = 6  # even number for testing
+num_collisions = 0
+
+ball = play.new_circle('black',
+                       x=0,
+                       y=0,
+                       radius=radius)
+
+ball.start_physics(x_speed=x_speed,
+                   obeys_gravity=False)
+
+
+box = play.new_box(color='black',
+                   x=300,
+                   y=0,
+                   width=30,
+                   height=300,
+                   border_color="black",
+                   border_width=10)
+
+@play.repeat_forever
+def check():
+    if ball.x < 0:
+        if num_collisions != 1:
+            pytest.fail(f'num_collisions ({num_collisions}) should be one')
+        sys.exit()
+
+@ball.when_touching(box)
+def collision():
+    global num_collisions
+    num_collisions += 1
+    ball.x = 0
+    ball.physics.x_speed = -10
+
+play.start_program()
\ No newline at end of file
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
new file mode 100644
index 0000000..b1cc7a8
--- /dev/null
+++ b/tests/run_tests.sh
@@ -0,0 +1,4 @@
+cd ..
+python tests/x_speed.py &
+python tests/y_speed.py &
+python tests/collision.py &
\ No newline at end of file
diff --git a/tests/x_speed.py b/tests/x_speed.py
new file mode 100644
index 0000000..1c4d3c8
--- /dev/null
+++ b/tests/x_speed.py
@@ -0,0 +1,29 @@
+import sys
+sys.path.insert(0, '.')
+import play
+import pytest
+
+radius = 20
+x_speed = 6  # even number for testing
+num_frames = 0
+
+ball = play.new_circle('black',
+                       x=0,
+                       y=0,
+                       radius=radius)
+
+ball.start_physics(x_speed=x_speed,
+                   obeys_gravity=False)
+
+
+@play.repeat_forever
+def always():
+    global num_frames
+    if num_frames < ((play.globals.WIDTH/2) - radius):
+        if round(ball.x) != num_frames:
+            pytest.fail(f'expected ball.x ({ball.x}) to be num of frames ({num_frames})')
+    else:
+        sys.exit()
+    num_frames += 1
+
+play.start_program()
diff --git a/tests/y_speed.py b/tests/y_speed.py
new file mode 100644
index 0000000..cd41391
--- /dev/null
+++ b/tests/y_speed.py
@@ -0,0 +1,29 @@
+import sys
+sys.path.insert(0, '.')
+import play
+import pytest
+
+radius = 20
+y_speed = 6  # even number for testing
+num_frames = 0
+
+ball = play.new_circle('black',
+                       x=0,
+                       y=0,
+                       radius=radius)
+
+ball.start_physics(y_speed=y_speed,
+                   obeys_gravity=False)
+
+
+@play.repeat_forever
+def always():
+    global num_frames
+    if num_frames < ((play.globals.HEIGHT/2) - radius):
+        if round(ball.y) != num_frames:
+            pytest.fail(f'expected ball.y ({ball.y}) to be num of frames ({num_frames})')
+    else:
+        sys.exit()
+    num_frames += 1
+
+play.start_program()