Add jest coverage requirements

Author: turt2live

jest.config.js

@@ -2,4 +2,14 @@
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
-};
+  collectCoverage: true,
+  collectCoverageFrom: ["./src/**"],
+  coverageThreshold: {
+    global: {
+      lines: 100,
+      branches: 100,
+      functions: 100,
+      statements: -1,
+    },
+  },
+};