test: icss reserved keywords (#839)

Author: evilebottnawi

test/__snapshots__/icss.test.js.snap

@@ -97,6 +97,28 @@ Array [
 
 exports[`ICSS case export: warnings 1`] = `Array []`;
 
+exports[`ICSS case export-reserved-keywords: errors 1`] = `Array []`;
+
+exports[`ICSS case export-reserved-keywords: locals 1`] = `
+Object {
+  "constructor": "constructor",
+  "toString": "toString",
+}
+`;
+
+exports[`ICSS case export-reserved-keywords: module (evaluated) 1`] = `
+Array [
+  Array [
+    1,
+    "
+",
+    "",
+  ],
+]
+`;
+
+exports[`ICSS case export-reserved-keywords: warnings 1`] = `Array []`;
+
 exports[`ICSS case import: errors 1`] = `Array []`;
 
 exports[`ICSS case import: locals 1`] = `
@@ -126,6 +148,37 @@ Array [
 
 exports[`ICSS case import: warnings 1`] = `Array []`;
 
+exports[`ICSS case import-reserved-keywords: errors 1`] = `Array []`;
+
+exports[`ICSS case import-reserved-keywords: locals 1`] = `
+Object {
+  "primary-color": "red",
+  "secondary-color": "block",
+}
+`;
+
+exports[`ICSS case import-reserved-keywords: module (evaluated) 1`] = `
+Array [
+  Array [
+    2,
+    "
+",
+    "",
+  ],
+  Array [
+    1,
+    ".className {
+  color: red;
+  display: block;
+}
+",
+    "",
+  ],
+]
+`;
+
+exports[`ICSS case import-reserved-keywords: warnings 1`] = `Array []`;
+
 exports[`ICSS case multiple-export: errors 1`] = `Array []`;
 
 exports[`ICSS case multiple-export: locals 1`] = `

test/fixtures/icss/tests-cases/export-reserved-keywords/source.css

@@ -0,0 +1,4 @@
+:export {
+  constructor: constructor;
+  toString: toString;
+}

test/fixtures/icss/tests-cases/import-reserved-keywords/source.css

@@ -0,0 +1,14 @@
+:import("./vars.css") {
+  constructor: primary-color;
+  toString: secondary-color;
+}
+
+.className {
+  color: constructor;
+  display: toString;
+}
+
+:export {
+  primary-color: constructor;
+  secondary-color: toString;
+}

test/fixtures/icss/tests-cases/import-reserved-keywords/vars.css

@@ -0,0 +1,4 @@
+:export {
+  primary-color: red;
+  secondary-color: block;
+}

test/helpers.js

@@ -33,6 +33,7 @@ function evaluated(output, modules, moduleId = 1) {
           const importedPaths = [
             'postcss-present-env',
             'icss/tests-cases/import',
+            'icss/tests-cases/import-reserved-keywords',
             'import',
             'import/node_modules',
             'url',