1 files changed, 57 insertions, 0 deletions
diff --git a/scss/tests/functions/compass/test_gradients.py b/scss/tests/functions/compass/test_gradients.py
new file mode 100644
index 0000000..e555b4b
--- /dev/null
+++ b/scss/tests/functions/compass/test_gradients.py
@@ -0,0 +1,57 @@
+"""Tests for Compass gradient generation."""
+
+from scss.expression import Calculator
+from scss.functions.compass.gradients import COMPASS_GRADIENTS_LIBRARY, linear_gradient
+from scss.rule import Namespace
+from scss.types import String, List, Number, Color
+
+import pytest
+
+
+@pytest.fixture
+def calc():
+    ns = Namespace(functions=COMPASS_GRADIENTS_LIBRARY)
+    return Calculator(ns).evaluate_expression
+
+
+def test_linear_gradient():
+    # Set up some values
+    to = String.unquoted('to')
+    bottom = String.unquoted('bottom')
+    left = String.unquoted('left')
+    angle = Number(45, 'deg')
+
+    red = Color.from_name('red')
+    blue = Color.from_name('blue')
+
+    start = Number(0, "%")
+    middle = Number(50, "%")
+    end = Number(100, "%")
+
+    assert (
+        linear_gradient(left, List((red, start)), List((blue, middle)))
+        == String('linear-gradient(left, red, blue 50%)')
+    )
+
+    assert (
+        linear_gradient(List((to, bottom)), blue, List((red, end)))
+        == String('linear-gradient(to bottom, blue, red)')
+    )
+
+
+@pytest.mark.xfail("rainbow still has intermediate values added")
+def test_linear_gradient_idempotent(calc):
+    # linear-gradient should leave valid syntax alone.
+    # Examples graciously stolen from MDN:
+    # https://developer.mozilla.org/en-US/docs/Web/CSS/linear-gradient
+    trials = [
+        'linear-gradient(45deg, blue, red)',
+        'linear-gradient(to left top, blue, red)',
+        'linear-gradient(0deg, blue, green 40%, red)',
+        'linear-gradient(to right, red, orange, yellow, green, blue, indigo, violet)',
+        'linear-gradient(to bottom right, red, rgba(255,0,0,0))',
+        'linear-gradient(to bottom, hsl(0, 80%, 70%), #bada55)',
+    ]
+
+    for trial in trials:
+        assert calc(trial) == String(trial)