1 files changed, 37 insertions, 0 deletions
diff --git a/servo/tests/unit/style/parsing/transition_timing_function.rs b/servo/tests/unit/style/parsing/transition_timing_function.rs
new file mode 100644
index 0000000000..2d22f24459
--- /dev/null
+++ b/servo/tests/unit/style/parsing/transition_timing_function.rs
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+use parsing::parse;
+use style::properties::longhands::transition_timing_function;
+use style_traits::ToCss;
+
+#[test]
+fn test_cubic_bezier() {
+    assert_roundtrip_with_context!(transition_timing_function::parse, "cubic-bezier(0, 0, 0, 0)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "cubic-bezier(0.25, 0, 0.5, 0)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "cubic-bezier(1, 1, 1, 1)");
+
+    // p1x and p2x values must be in range [0, 1]
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(-1, 0, 0, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(0, 0, -1, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(-1, 0, -1, 0").is_err());
+
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(2, 0, 0, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(0, 0, 2, 0").is_err());
+    assert!(parse(transition_timing_function::parse, "cubic-bezier(2, 0, 2, 0").is_err());
+}
+
+#[test]
+fn test_steps() {
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(1)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(  1)", "steps(1)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(1, start)");
+    assert_roundtrip_with_context!(transition_timing_function::parse, "steps(2, end) ", "steps(2)");
+
+    // Step interval value must be an integer greater than 0
+    assert!(parse(transition_timing_function::parse, "steps(0)").is_err());
+    assert!(parse(transition_timing_function::parse, "steps(0.5)").is_err());
+    assert!(parse(transition_timing_function::parse, "steps(-1)").is_err());
+    assert!(parse(transition_timing_function::parse, "steps(1, middle)").is_err());
+}