1 files changed, 54 insertions, 1 deletions
diff --git a/tests/test_functions_chaserstep.py b/tests/test_functions_chaserstep.py
index 134b893..6185f46 100644
--- a/tests/test_functions_chaserstep.py
+++ b/tests/test_functions_chaserstep.py
@@ -11,10 +11,17 @@ from blc2.constants import INHERIT, MANUAL, EXTERNAL, INTERNAL, INFTY
 
 class DummyChaser:
     def register_step(self, *args, **kwargs):
-        return
+        if self.throw:
+            raise Exception("blah")
+        self.count += 1
+
+    def delete_step(self, *args, **kwargs):
+        self.count -= 1
 
     def __init__(self, w):
         self.w = w
+        self.count = 0
+        self.throw = False
 
 @pytest.fixture
 def cw():
@@ -35,10 +42,24 @@ def test_chaserstep(cw):
     a = cw.functions[2]
     c0, = cw.fixtures[0].channels
 
+    ## Try adding a negative index
+    with pytest.raises(Exception):
+        ChaserStep(c, id_=42069, function=s0, duration_mode=INHERIT, index=-10)
+    assert c.count == 0
+    assert 42069 not in cw.functions
+
+    ## Test a failed add
+    with pytest.raises(Exception):
+        c.throw = True
+        ChaserStep(c, id_=42069, function=s0, duration_mode=INHERIT)
+    assert 42069 not in cw.functions
+    c.throw = False
+
     ## Test how it handles inherit
     cs1 = ChaserStep(c, function=s0, duration_mode=INHERIT)
     assert cs1.duration == INFTY
     assert cs1.actual_duration == INFTY
+    assert cs1.duration_mode == INHERIT
     assert cs1.fade_out_mode == s0.fade_out_mode
     assert cs1.scope == s0.scope
     assert cs1.audio_scope == s0.audio_scope
@@ -122,3 +143,35 @@ def test_chaserstep(cw):
     lc, ac, data = cs1.render(3025, data)
     assert not lc
     assert not ac
+
+    cs1.function = None
+    assert cs1.duration == 0
+    assert cs1.actual_duration == 0
+
+    cs1.fade_in = 100
+    with pytest.raises(ValueError):
+        cs1.fade_in = -100
+    assert cs1.fade_in == 100
+
+    cs1.fade_out = 100
+    with pytest.raises(ValueError):
+        cs1.fade_out = -100
+    assert cs1.fade_out == 100
+
+    cs1.function = s0
+    s0.delete()
+    assert cs1.function is None
+    assert cs1.audio_scope == frozenset()
+    assert cs1.scope == frozenset()
+    cs1.duration_mode = INHERIT
+    with pytest.raises(AttributeError):
+        cs1.duration = 50
+    assert cs1.render(10000, data)[:2] == ((), ())
+
+    cs1.duration_mode = MANUAL
+    cs1.duration = 500
+    with pytest.raises(ValueError):
+        cs1.duration = -100
+    assert cs1.duration == 500
+
+