split node tests into standalone files

tests/node_tests/test_range_slider.py

@@ -0,0 +1,16 @@
+def test_range_slider():
+    from backend.nodes.range_slider import RangeSlider
+
+    node = RangeSlider()
+
+    result = node.process(min_value=0.0, max_value=10.0, value=3.25)
+    assert result == (3.25,)
+
+    result_high = node.process(min_value=0.0, max_value=10.0, value=12.0)
+    assert result_high == (10.0,)
+
+    result_reversed = node.process(min_value=5.0, max_value=-1.0, value=4.0)
+    assert result_reversed == (4.0,)
+
+    result_fixed = node.process(min_value=2.5, max_value=2.5, value=99.0)
+    assert result_fixed == (2.5,)