Setup and configure Jest for testing

.gitignore

@@ -1,6 +1,7 @@
 node_modules/
 .DS_Store
 dist/
+coverage/
 
 ### VisualStudioCode ###
 .vscode/*

jest.config.js

@@ -0,0 +1,26 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  moduleFileExtensions: ['ts', 'js', 'jsx', 'tsx', 'json', 'node'],
+  roots: ['<rootDir>/src/', 'node_modules'],
+  modulePaths: ['<rootDir>', 'node_modules'],
+  moduleDirectories: ['src', 'node_modules'],
+  moduleNameMapper: {
+    'src/(.*)': '<rootDir>/src/$1',
+    obsidian: '<rootDir>/node_modules/obsidian/obsidian.d.ts',
+  },
+  transform: {
+    '^.+\\.js$': 'babel-jest',
+    '^.+\\.(ts|tsx)$': 'ts-jest',
+  },
+  transformIgnorePatterns: ['\\.pnp\\.[^\\/]+$'],
+  collectCoverage: true,
+  coverageThreshold: {
+    global: {
+      branches: 20,
+      functions: 20,
+      lines: 20,
+      statements: 20,
+    },
+  },
+};