Move tests to their own file and add some

Author: nilaybhatia

tests/test_container.py

@@ -1,4 +1,3 @@
-from manim.mobject.value_tracker import ValueTracker
 import pytest
 from manim import Container, Mobject, Scene
 
@@ -76,15 +75,3 @@ def test_scene_remove():
     container_remove(scene, lambda: scene.mobjects)
 
 
-def test_value_tracker_increment_value():
-    """Test ValueTracker.increment_value()"""
-    tracker = ValueTracker(0.0)
-    tracker.increment_value(10.0)
-    assert tracker.get_value() == 10.0
-
-
-def test_value_tracker_iadd():
-    """Test ValueTracker.__iadd__()"""
-    tracker = ValueTracker(0.0)
-    tracker += 10.0
-    assert tracker.get_value() == 10.0

tests/test_value_tracker.py

@@ -0,0 +1,25 @@
+from manim.mobject.value_tracker import ValueTracker
+
+def test_value_tracker_set_value():
+    """Test ValueTracker.set_value"""
+    tracker = ValueTracker()
+    tracker.set_value(10.0)
+    assert tracker.get_value() == 10.0
+
+def test_value_tracker_get_value():
+    """Test ValueTracker.get_value"""
+    tracker = ValueTracker(10.0)
+    assert tracker.get_value() == 10.0
+
+def test_value_tracker_increment_value():
+    """Test ValueTracker.increment_value()"""
+    tracker = ValueTracker(0.0)
+    tracker.increment_value(10.0)
+    assert tracker.get_value() == 10.0
+
+
+def test_value_tracker_iadd():
+    """Test ValueTracker.__iadd__()"""
+    tracker = ValueTracker(0.0)
+    tracker += 10.0
+    assert tracker.get_value() == 10.0