diff --git a/package-lock.json b/package-lock.json
index 6439014..05b6af8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1402,6 +1402,21 @@
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@@ -2345,6 +2360,12 @@
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@@ -3151,6 +3172,23 @@
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+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.1.2.tgz",
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+      "dev": true,
+      "requires": {
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+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.5.tgz",
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@@ -3263,6 +3301,12 @@
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       "dev": true
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+    "lodash.memoize": {
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+      "resolved": "https://registry.npmjs.org/lodash.memoize/-/lodash.memoize-4.1.2.tgz",
+      "integrity": "sha1-vMbEmkKihA7Zl/Mj6tpezRguC/4=",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/lodash.mergewith/-/lodash.mergewith-4.6.2.tgz",
@@ -3340,6 +3384,12 @@
         "semver": "^6.0.0"
       }
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+    "make-error": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.6.tgz",
+      "integrity": "sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==",
+      "dev": true
+    },
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@@ -8685,6 +8735,92 @@
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+      "resolved": "https://registry.npmjs.org/ts-jest/-/ts-jest-25.3.1.tgz",
+      "integrity": "sha512-O53FtKguoMUByalAJW+NWEv7c4tus5ckmhfa7/V0jBb2z8v5rDSLFC1Ate7wLknYPC1euuhY6eJjQq4FtOZrkg==",
+      "dev": true,
+      "requires": {
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+        "buffer-from": "1.x",
+        "fast-json-stable-stringify": "2.x",
+        "json5": "2.x",
+        "lodash.memoize": "4.x",
+        "make-error": "1.x",
+        "micromatch": "4.x",
+        "mkdirp": "1.x",
+        "resolve": "1.x",
+        "semver": "6.x",
+        "yargs-parser": "18.x"
+      },
+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
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+          "dev": true,
+          "requires": {
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+          }
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+        "camelcase": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
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+        },
+        "fill-range": {
+          "version": "7.0.1",
+          "resolved": "https://registry.npmjs.org/fill-range/-/fill-range-7.0.1.tgz",
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+          "dev": true,
+          "requires": {
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+          }
+        },
+        "is-number": {
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+          "resolved": "https://registry.npmjs.org/is-number/-/is-number-7.0.0.tgz",
+          "integrity": "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==",
+          "dev": true
+        },
+        "micromatch": {
+          "version": "4.0.2",
+          "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.2.tgz",
+          "integrity": "sha512-y7FpHSbMUMoyPbYUSzO6PaZ6FyRnQOpHuKwbo1G+Knck95XVU4QAiKdGEnj5wwoS7PlOgthX/09u5iFJ+aYf5Q==",
+          "dev": true,
+          "requires": {
+            "braces": "^3.0.1",
+            "picomatch": "^2.0.5"
+          }
+        },
+        "mkdirp": {
+          "version": "1.0.4",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
+          "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==",
+          "dev": true
+        },
+        "to-regex-range": {
+          "version": "5.0.1",
+          "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
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+          "dev": true,
+          "requires": {
+            "is-number": "^7.0.0"
+          }
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+        "yargs-parser": {
+          "version": "18.1.2",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.2.tgz",
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+          "dev": true,
+          "requires": {
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+            "decamelize": "^1.2.0"
+          }
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diff --git a/package.json b/package.json
index 8036e5b..e95fa22 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "rimraf": "^3.0.2",
     "semantic-release": "^17.0.4",
     "semantic-release-gitmoji": "^1.3.3",
+    "ts-jest": "^25.3.1",
     "typescript": "^3.8.3"
   },
   "dependencies": {