diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index a583bf53c..d0a241137 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -161,7 +161,7 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4.1.0
       - name: Install tooling
-        uses: asdf-vm/actions/install@6a442392015fbbdd8b48696d41e0051b2698b2e4 # v2.2.0
+        uses: asdf-vm/actions/install@4f8f7939dd917fc656bb7c3575969a5988c28364 # v3.0.0
       - name: Install Node.js
         uses: actions/setup-node@5e21ff4d9bc1a8cf6de233a3057d20ec6b3fb69d # v3.8.1
         with:
diff --git a/stryker.integration.config.js b/stryker.integration.config.js
index f7a8e0834..8e4714b47 100644
--- a/stryker.integration.config.js
+++ b/stryker.integration.config.js
@@ -3,7 +3,7 @@
 export default {
   coverageAnalysis: "perTest",
   inPlace: false,
-  mutate: ["index.js"],
+  mutate: ["index.js", "testing.js"],
   testRunner: "tap",
   tap: {
     testFiles: ["test/integration/**/*.test.js"],
diff --git a/test/integration/testing/commonjs.test.js b/test/integration/testing/commonjs.test.js
index a0576fd24..49d425f78 100644
--- a/test/integration/testing/commonjs.test.js
+++ b/test/integration/testing/commonjs.test.js
@@ -1,20 +1,36 @@
 /**
  * @overview Contains integration tests for the CommonJS version of the testing
- * implementations of Shescape.
+ * utilities provided with Shescape.
  * @license MIT
  */
 
 import { testProp } from "@fast-check/ava";
+import test from "ava";
 import * as fc from "fast-check";
 
 import { arbitrary } from "../_.js";
 
-import { Shescape as Stubscape, Throwscape } from "shescape/testing";
 import {
+  injectionStrings,
+  Shescape as Stubscape,
+  Throwscape,
+} from "shescape/testing";
+import {
+  injectionStrings as injectionStringsCjs,
   Shescape as StubscapeCjs,
   Throwscape as ThrowscapeCjs,
 } from "../../../testing.cjs";
 
+test("injection strings", (t) => {
+  for (const injectionStringCjs of injectionStringsCjs) {
+    t.true(injectionStrings.includes(injectionStringCjs));
+  }
+
+  for (const injectionString of injectionStrings) {
+    t.true(injectionStringsCjs.includes(injectionString));
+  }
+});
+
 testProp(
   "Stubscape#escape (esm === cjs)",
   [arbitrary.shescapeArg(), arbitrary.shescapeOptions()],
@@ -97,20 +113,20 @@ testProp(
   "Throwscape#constructor (esm === cjs)",
   [arbitrary.shescapeOptions()],
   (t, options) => {
-    let errorEsm, errorCjs;
+    let erroredEsm, erroredCjs;
 
     try {
       new Throwscape(options);
-    } catch (error) {
-      errorEsm = error;
+    } catch (_) {
+      erroredEsm = true;
     }
 
     try {
       new ThrowscapeCjs(options);
-    } catch (error) {
-      errorCjs = error;
+    } catch (_) {
+      erroredCjs = true;
     }
 
-    t.deepEqual(errorEsm, errorCjs);
+    t.deepEqual(erroredEsm, erroredCjs);
   },
 );
diff --git a/test/integration/testing/functional.test.js b/test/integration/testing/functional.test.js
index ec84f75db..7991a6be7 100644
--- a/test/integration/testing/functional.test.js
+++ b/test/integration/testing/functional.test.js
@@ -1,16 +1,31 @@
 /**
- * @overview Contains integration tests for the testing implementations of
+ * @overview Contains integration tests for the testing utilities provided with
  * Shescape.
  * @license MIT
  */
 
 import { testProp } from "@fast-check/ava";
+import test from "ava";
 import * as fc from "fast-check";
 
 import { arbitrary } from "../_.js";
 
 import { Shescape } from "shescape";
-import { Shescape as Stubscape, Throwscape } from "shescape/testing";
+import {
+  injectionStrings,
+  Shescape as Stubscape,
+  Throwscape,
+} from "shescape/testing";
+
+test("injection strings", (t) => {
+  t.true(Array.isArray(injectionStrings));
+  t.true(injectionStrings.length > 0);
+
+  for (const injectionString of injectionStrings) {
+    t.is(typeof injectionString, "string");
+    t.true(injectionString.length > 0);
+  }
+});
 
 testProp(
   "Stubscape#escape (stubscape =~ shescape)",
diff --git a/test/unit/testing/injection-strings.test.js b/test/unit/testing/injection-strings.test.js
deleted file mode 100644
index 85d1b926b..000000000
--- a/test/unit/testing/injection-strings.test.js
+++ /dev/null
@@ -1,14 +0,0 @@
-/**
- * @overview Contains unit tests for the injection strings test helper.
- * @license MIT
- */
-
-import test from "ava";
-
-import { injectionStrings } from "../../../testing.js";
-
-test("types", (t) => {
-  for (const injectionString of injectionStrings) {
-    t.is(typeof injectionString, "string");
-  }
-});
diff --git a/test/unit/testing/stubscape.test.js b/test/unit/testing/stubscape.test.js
index d5f1bc8cf..348a90a63 100644
--- a/test/unit/testing/stubscape.test.js
+++ b/test/unit/testing/stubscape.test.js
@@ -146,7 +146,7 @@ test("quoteAll invalid arguments", (t) => {
 testProp(
   "quoteAll without a shell",
   [
-    fc.array(arbitrary.shescapeArg()),
+    fc.array(arbitrary.shescapeArg(), { minLength: 1 }),
     arbitrary.shescapeOptions().filter((options) => options?.shell === false),
   ],
   (t, args, options) => {
diff --git a/testing.js b/testing.js
index 9e999149a..d0e8ea424 100644
--- a/testing.js
+++ b/testing.js
@@ -58,11 +58,7 @@ export class Shescape {
   }
 
   quoteAll(args) {
-    if (this.shell === false) {
-      throw new Error();
-    }
-
-    return this.escapeAll(args);
+    return args.map((arg) => this.quote(arg));
   }
 }