diff --git a/package-lock.json b/package-lock.json
index d17be96..db74323 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -12,6 +12,7 @@
         "execa": "^5.1.1",
         "lerna-changelog": "^2.2.0",
         "mdast-util-from-markdown": "^1.0.4",
+        "sinon": "^11.1.2",
         "tmp": "^0.2.1",
         "validate-peer-dependencies": "^2.0.0",
         "which": "^2.0.2"
@@ -392,6 +393,37 @@
         "url": "https://github.com/sindresorhus/is?sponsor=1"
       }
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+    "node_modules/@sinonjs/commons": {
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+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.3.tgz",
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+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-7.1.2.tgz",
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+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-6.0.2.tgz",
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+        "lodash.get": "^4.4.2",
+        "type-detect": "^4.0.8"
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+      "resolved": "https://registry.npmjs.org/@sinonjs/text-encoding/-/text-encoding-0.7.1.tgz",
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       "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-4.0.6.tgz",
@@ -1615,6 +1647,14 @@
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+      "resolved": "https://registry.npmjs.org/diff/-/diff-5.0.0.tgz",
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       "dev": true
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+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+      "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
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@@ -3208,6 +3253,11 @@
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+      "resolved": "https://registry.npmjs.org/just-extend/-/just-extend-4.2.1.tgz",
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+      "resolved": "https://registry.npmjs.org/lodash.get/-/lodash.get-4.4.2.tgz",
+      "integrity": "sha1-LRd/ZS+jHpObRDjVNBSZ36OCXpk="
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@@ -4200,6 +4255,18 @@
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+      "resolved": "https://registry.npmjs.org/nise/-/nise-5.1.0.tgz",
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+        "@sinonjs/fake-timers": "^7.0.4",
+        "@sinonjs/text-encoding": "^0.7.1",
+        "just-extend": "^4.0.2",
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@@ -4821,6 +4888,14 @@
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+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-1.8.0.tgz",
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+      }
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       "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
@@ -5631,6 +5706,23 @@
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     },
+    "node_modules/sinon": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-11.1.2.tgz",
+      "integrity": "sha512-59237HChms4kg7/sXhiRcUzdSkKuydDeTiamT/jesUVHshBgL8XAmhgFo0GfK6RruMDM/iRSij1EybmMog9cJw==",
+      "dependencies": {
+        "@sinonjs/commons": "^1.8.3",
+        "@sinonjs/fake-timers": "^7.1.2",
+        "@sinonjs/samsam": "^6.0.2",
+        "diff": "^5.0.0",
+        "nise": "^5.1.0",
+        "supports-color": "^7.2.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/sinon"
+      }
+    },
     "node_modules/slash": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
@@ -6076,6 +6168,14 @@
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       }
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+    "node_modules/type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g==",
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/type-fest": {
       "version": "0.20.2",
       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
@@ -6243,14 +6343,6 @@
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-      }
-    },
     "node_modules/v8-compile-cache": {
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@@ -6821,6 +6913,37 @@
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       "dev": true
     },
+    "@sinonjs/commons": {
+      "version": "1.8.3",
+      "resolved": "https://registry.npmjs.org/@sinonjs/commons/-/commons-1.8.3.tgz",
+      "integrity": "sha512-xkNcLAn/wZaX14RPlwizcKicDk9G3F8m2nU3L7Ukm5zBgTwiT0wsoFAHx9Jq56fJA1z/7uKGtCRu16sOUCLIHQ==",
+      "requires": {
+        "type-detect": "4.0.8"
+      }
+    },
+    "@sinonjs/fake-timers": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/fake-timers/-/fake-timers-7.1.2.tgz",
+      "integrity": "sha512-iQADsW4LBMISqZ6Ci1dupJL9pprqwcVFTcOsEmQOEhW+KLCVn/Y4Jrvg2k19fIHCp+iFprriYPTdRcQR8NbUPg==",
+      "requires": {
+        "@sinonjs/commons": "^1.7.0"
+      }
+    },
+    "@sinonjs/samsam": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-6.0.2.tgz",
+      "integrity": "sha512-jxPRPp9n93ci7b8hMfJOFDPRLFYadN6FSpeROFTR4UNF4i5b+EK6m4QXPO46BDhFgRy1JuS87zAnFOzCUwMJcQ==",
+      "requires": {
+        "@sinonjs/commons": "^1.6.0",
+        "lodash.get": "^4.4.2",
+        "type-detect": "^4.0.8"
+      }
+    },
+    "@sinonjs/text-encoding": {
+      "version": "0.7.1",
+      "resolved": "https://registry.npmjs.org/@sinonjs/text-encoding/-/text-encoding-0.7.1.tgz",
+      "integrity": "sha512-+iTbntw2IZPb/anVDbypzfQa+ay64MW0Zo8aJ8gZPWMMK6/OubMVb6lUPMagqjOPnmtauXnFCACVl3O7ogjeqQ=="
+    },
     "@szmarczak/http-timer": {
       "version": "4.0.6",
       "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-4.0.6.tgz",
@@ -7756,6 +7879,11 @@
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     },
+    "diff": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-5.0.0.tgz",
+      "integrity": "sha512-/VTCrvm5Z0JGty/BWHljh+BAiw3IK+2j87NGMu8Nwc/f48WoDAC395uomO9ZD117ZOBaHmkX1oyLvkVM/aIT3w=="
+    },
     "dir-glob": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/dir-glob/-/dir-glob-3.0.1.tgz",
@@ -8873,6 +9001,11 @@
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       "dev": true
     },
+    "isarray": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+      "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
+    },
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       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/isexe/-/isexe-2.0.0.tgz",
@@ -8930,6 +9063,11 @@
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       "dev": true
     },
+    "just-extend": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/just-extend/-/just-extend-4.2.1.tgz",
+      "integrity": "sha512-g3UB796vUFIY90VIv/WX3L2c8CS2MdWUww3CNrYmqza1Fg0DURc2K/O4YrnklBdQarSJ/y8JnJYDGc+1iumQjg=="
+    },
     "keyv": {
       "version": "4.0.3",
       "resolved": "https://registry.npmjs.org/keyv/-/keyv-4.0.3.tgz",
@@ -9045,6 +9183,11 @@
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       "dev": true
     },
+    "lodash.get": {
+      "version": "4.4.2",
+      "resolved": "https://registry.npmjs.org/lodash.get/-/lodash.get-4.4.2.tgz",
+      "integrity": "sha1-LRd/ZS+jHpObRDjVNBSZ36OCXpk="
+    },
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       "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
@@ -9575,6 +9718,18 @@
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+    "nise": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/nise/-/nise-5.1.0.tgz",
+      "integrity": "sha512-W5WlHu+wvo3PaKLsJJkgPup2LrsXCcm7AWwyNZkUnn5rwPkuPBi3Iwk5SQtN0mv+K65k7nKKjwNQ30wg3wLAQQ==",
+      "requires": {
+        "@sinonjs/commons": "^1.7.0",
+        "@sinonjs/fake-timers": "^7.0.4",
+        "@sinonjs/text-encoding": "^0.7.1",
+        "just-extend": "^4.0.2",
+        "path-to-regexp": "^1.7.0"
+      }
+    },
     "node-fetch": {
       "version": "2.6.5",
       "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.5.tgz",
@@ -10051,6 +10206,14 @@
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       "integrity": "sha1-v8zcjfWxLcUsi0PsONGNcsBLqW0="
     },
+    "path-to-regexp": {
+      "version": "1.8.0",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-1.8.0.tgz",
+      "integrity": "sha512-n43JRhlUKUAlibEJhPeir1ncUID16QnEjNpwzNdO3Lm4ywrBpBZ5oLD0I6br9evr1Y9JTqwRtAh7JLoOzAQdVA==",
+      "requires": {
+        "isarray": "0.0.1"
+      }
+    },
     "path-type": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/path-type/-/path-type-4.0.0.tgz",
@@ -10630,6 +10793,19 @@
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       "integrity": "sha512-KWcOiKeQj6ZyXx7zq4YxSMgHRlod4czeBQZrPb8OKcohcqAXShm7E20kEMle9WBt26hFcAf0qLOcp5zmY7kOqQ=="
     },
+    "sinon": {
+      "version": "11.1.2",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-11.1.2.tgz",
+      "integrity": "sha512-59237HChms4kg7/sXhiRcUzdSkKuydDeTiamT/jesUVHshBgL8XAmhgFo0GfK6RruMDM/iRSij1EybmMog9cJw==",
+      "requires": {
+        "@sinonjs/commons": "^1.8.3",
+        "@sinonjs/fake-timers": "^7.1.2",
+        "@sinonjs/samsam": "^6.0.2",
+        "diff": "^5.0.0",
+        "nise": "^5.1.0",
+        "supports-color": "^7.2.0"
+      }
+    },
     "slash": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
@@ -10969,6 +11145,11 @@
         "prelude-ls": "^1.2.1"
       }
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+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g=="
+    },
     "type-fest": {
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       "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-0.20.2.tgz",
@@ -11102,13 +11283,6 @@
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-          "resolved": "https://registry.npmjs.org/diff/-/diff-5.0.0.tgz",
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-        }
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     },
     "v8-compile-cache": {
diff --git a/package.json b/package.json
index 6ca77ca..a1dde2c 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
     "execa": "^5.1.1",
     "lerna-changelog": "^2.2.0",
     "mdast-util-from-markdown": "^1.0.4",
+    "sinon": "^11.1.2",
     "tmp": "^0.2.1",
     "validate-peer-dependencies": "^2.0.0",
     "which": "^2.0.2"