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

Author: sjoqvist

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

@@ -0,0 +1,24 @@
+._input__layer1A {
+  color: red;
+}
+
+._input__layer2A {
+}
+
+._input__layer1B {
+}
+
+._input__layer2B {
+  background: blue;
+}
+
+._input__layer3 {
+}
+
+: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;
+}

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

@@ -0,0 +1,20 @@
+:local(.layer1A) {
+  color: red;
+}
+
+:local(.layer2A) {
+  composes: layer1A;
+}
+
+:local(.layer1B) {
+}
+
+:local(.layer2B) {
+  background: blue;
+  composes: layer1B;
+}
+
+:local(.layer3) {
+  composes: layer2A;
+  composes: layer2B;
+}