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defmodule Volt.CSS.ModulesTest do
use ExUnit.Case, async: true
describe "css_module?/1" do
test "identifies .module.css files" do
assert Volt.CSS.Modules.css_module?("button.module.css")
assert Volt.CSS.Modules.css_module?("path/to/style.module.css")
end
test "rejects non-module CSS" do
refute Volt.CSS.Modules.css_module?("app.css")
refute Volt.CSS.Modules.css_module?("module.css.bak")
end
end
describe "compile/2" do
test "generates scoped class names" do
{:ok, js, css} = Volt.CSS.Modules.compile(".primary { color: blue }", "button.module.css")
assert js =~ "export default"
assert js =~ "primary"
refute css =~ ~r/\.primary[^_]/
assert css =~ "primary"
assert css =~ "color"
end
test "handles multiple classes" do
source = """
.title { font-size: 2em }
.subtitle { font-size: 1.2em }
.active { color: green }
"""
{:ok, js, css} = Volt.CSS.Modules.compile(source, "heading.module.css")
mapping = extract_mapping(js)
assert Map.has_key?(mapping, "title")
assert Map.has_key?(mapping, "subtitle")
assert Map.has_key?(mapping, "active")
for {_original, scoped} <- mapping do
assert css =~ scoped
end
end
test "different files produce different scoped names" do
{:ok, js1, _css1} = Volt.CSS.Modules.compile(".box { }", "a.module.css")
{:ok, js2, _css2} = Volt.CSS.Modules.compile(".box { }", "b.module.css")
map1 = extract_mapping(js1)
map2 = extract_mapping(js2)
assert map1["box"] != map2["box"]
end
end
defp extract_mapping(js) do
[_, json] = Regex.run(~r/(\{.*\})/, js)
Jason.decode!(json)
end
describe "Pipeline integration" do
test "compiles .module.css through pipeline" do
{:ok, result} =
Volt.Pipeline.compile("button.module.css", ".btn { color: red }")
assert result.code =~ "export default"
assert result.css =~ "btn"
assert result.css =~ "color"
end
end
end