Add numEql assertion

Author: Kacarott

workspace/lc-test.js

@@ -1,7 +1,9 @@
 import { readFileSync } from "fs";
 
-export { assert, config } from "chai";
-export * as LC from "@codewars/lambda-calculus";
+import { assert, config } from "chai";
+import * as LC from "../src/lambda-calculus.js";
+
+export { assert, config, LC };
 
 const read = (path) => readFileSync(new URL(path, import.meta.url), {encoding: "utf8"});
 
@@ -13,3 +15,16 @@ export const getPreloaded = () => read("./preloaded.lc");
 
 /** Return the contents of the preloaded file and the solution file combined */
 export const getSolutionWithPreloaded = () => getPreloaded() + "\n" + getSolution();
+
+
+/** Custom assertions */
+
+function numEql(got, exp, msg) {
+  if ( got?.term && got?.env ) got = LC.toInt(got);
+  if ( exp?.term && exp?.env ) exp = LC.toInt(exp);
+  return this.equal(got, exp, msg);
+}
+
+Object.assign(assert, {
+  numEql
+});