Add tests

Author: gregblt

babel.config.js

@@ -0,0 +1 @@
+module.exports = {presets: ['@babel/preset-env']}

jest.config.js

@@ -0,0 +1,27 @@
+module.exports = {
+    preset: 'ts-jest',
+    transform: {
+      '^.+\\.(ts|tsx)?$': 'ts-jest',
+      '^.+\\.(js|jsx)$': 'babel-jest',
+    },
+    "collectCoverage": true,
+    "maxWorkers": 4,
+    "bail": true,
+    "coverageReporters": [
+      "html",
+      "lcov",
+      "text",
+      "cobertura"
+    ],
+    "coverageThreshold": {
+      "global": {
+        "lines": 90
+      }
+    },
+    "reporters": [
+      "default",
+      "jest-junit"
+    ],
+    "runTestsByPath": true,
+    "openHandlesTimeout": 0
+  };