Loosened no-unused-expresssions rule for tests

Author: JamesMessinger

lib/javascript-test-rules.js

@@ -18,6 +18,19 @@ module.exports = {
    */
   "no-return-await": "off",
 
+  /**
+   * Warn about usage of expressions in statement position
+   *
+   * @see https://eslint.org/docs/rules/no-unused-expressions
+   */
+  "no-unused-expressions": [
+    "warn",
+    {
+      allowShortCircuit: true,   // allow short-circuited expressions (e.g. foo && bar())
+      allowTernary: true,        // allow ternary expressions (e.g. foo ? bar() : baz())
+    },
+  ],
+
   /**
    * allow async functions without an `await` keyword
    *