[Tests] no-cycle: Add tests for commonjs imports

tests/files/cycles/cjs/depth-one.js

@@ -0,0 +1,2 @@
+var foo = require("../depth-zero")
+module.exports = { foo }

tests/files/cycles/cjs/depth-three-indirect.js

@@ -0,0 +1,5 @@
+require('./depth-two')
+
+module.exports = function bar() {
+    return "side effects???"
+}

tests/files/cycles/cjs/depth-three-star.js

@@ -0,0 +1,2 @@
+var two = require("./depth-two")
+module.exports = { two }

tests/files/cycles/cjs/depth-two.js

@@ -0,0 +1,2 @@
+var { foo } = require("./depth-one")
+module.exports = { foo }

tests/src/rules/no-cycle.js

@@ -12,7 +12,7 @@ const test = def => _test(Object.assign(def, {
   filename: testFilePath('./cycles/depth-zero.js'),
 }));
 
-const testDialects = ['es6'];
+const testDialects = ['es6', 'cjs'];
 
 ruleTester.run('no-cycle', rule, {
   valid: [].concat(