test: add test case for the current handling of empty local blocks

Author: sjoqvist

test/test-cases/options-exportEmptyLocals-true/expected.css

@@ -0,0 +1,37 @@
+/* leaf node with contents */
+._input__layer1A {
+  color: red;
+}
+
+._input__layer2A /* doesn't add anything new */ {
+}
+
+._input__layer1B {
+  /* totally empty, except for this comment */
+}
+
+._input__layer2B {
+  background: blue;
+}
+
+._input__layer3 {
+}
+
+._input__foo  > ._input__bar {
+}
+
+._input__baz  > ._input__qux {
+  font-style: italic;
+}
+
+:export {
+  layer1A: _input__layer1A;
+  layer2A: _input__layer2A _input__layer1A;
+  layer1B: _input__layer1B;
+  layer2B: _input__layer2B _input__layer1B;
+  layer3: _input__layer3 _input__layer2A _input__layer1A _input__layer2B _input__layer1B;
+  foo: _input__foo;
+  bar: _input__bar;
+  baz: _input__baz;
+  qux: _input__qux;
+}

test/test-cases/options-exportEmptyLocals-true/source.css

@@ -0,0 +1,29 @@
+/* leaf node with contents */
+:local(.layer1A) {
+  color: red;
+}
+
+:local(.layer2A) /* doesn't add anything new */ {
+  composes: layer1A;
+}
+
+:local(.layer1B) {
+  /* totally empty, except for this comment */
+}
+
+:local(.layer2B) {
+  background: blue;
+  composes: layer1B;
+}
+
+:local(.layer3) {
+  composes: layer2A;
+  composes: layer2B;
+}
+
+:local(.foo) /* empty */ > :local(.bar) {
+}
+
+:local(.baz) /* non-empty */ > :local(.qux) {
+  font-style: italic;
+}