Instantiate (temporary) differential testing between old and new

PowerShell

Author: ericcornelissen

test/unit/win/differential.test.js

@@ -0,0 +1,53 @@
+/**
+ * @overview Contains differential tests for the migration form standard regular
+ * expressions to linear-time regular expressions in PoewrShell.
+ * @license MIT
+ */
+
+import { testProp } from "@fast-check/ava";
+import * as fc from "fast-check";
+
+import * as old from "../../../node_modules/shescape-previous/src/internal/win/powershell.js";
+import * as upd from "../../../src/internal/win/powershell.js";
+
+testProp(
+  "escape functionality is unchanged",
+  [fc.string()],
+  (t, arg) => {
+    const updFn = upd.getEscapeFunction();
+    const oldFn = old.getEscapeFunction();
+
+    const got = updFn(arg);
+    const want = oldFn(arg);
+    t.is(got, want);
+  },
+  { numRuns: 1_000_000 },
+);
+
+testProp(
+  "quote functionality is unchanged",
+  [fc.string()],
+  (t, arg) => {
+    const updFn = upd.getQuoteFunction();
+    const oldFn = old.getQuoteFunction();
+
+    const got = updFn[0](updFn[1](arg));
+    const want = oldFn[0](oldFn[1](arg));
+    t.is(got, want);
+  },
+  { numRuns: 1_000_000 },
+);
+
+testProp(
+  "flag protection functionality is unchanged",
+  [fc.string()],
+  (t, arg) => {
+    const updFn = upd.getFlagProtectionFunction();
+    const oldFn = old.getFlagProtectionFunction();
+
+    const got = updFn(arg);
+    const want = oldFn(arg);
+    t.is(got, want);
+  },
+  { numRuns: 1_000_000 },
+);