Feature/unit tests (#184)

core/jest.config.js

@@ -0,0 +1,17 @@
+const { pathsToModuleNameMapper } = require('ts-jest');
+
+const { compilerOptions } = require('./tsconfig.base');
+
+module.exports = {
+  preset: 'ts-jest',
+  transform: {
+    '\\.[jt]sx?$': ['ts-jest', { tsConfig: 'tsconfig.dev.json' }],
+    '^.+\\.svg$': './test/fileTransformer',
+  },
+  moduleNameMapper: {
+    ...pathsToModuleNameMapper(compilerOptions.paths, { prefix: '<rootDir>/' }),
+    '\\.(css|less)$': '<rootDir>/src/__mocks__/styleMock.ts',
+  },
+  transformIgnorePatterns: ['node_modules/(?!(url-join|array-move|ol)/)'],
+  setupFiles: ['./test/setupEnv.js'],
+};