Add Jest test setup for smtp block (#1892)

Part of OPS-3307.

## Additional Notes
- Adds a proper Jest testing setup for the smtp block

Author: MarceloRGonc

packages/blocks/smtp/jest.config.ts

@@ -0,0 +1,11 @@
+export default {
+  displayName: 'blocks-smtp',
+  preset: '../../../jest.preset.js',
+  setupFiles: ['../../../jest.env.js'],
+  testEnvironment: 'node',
+  transform: {
+    '^.+\\.[tj]s$': ['ts-jest', { tsconfig: '<rootDir>/tsconfig.spec.json' }],
+  },
+  moduleFileExtensions: ['ts', 'js', 'html'],
+  coverageDirectory: '../../../coverage/packages/blocks/smtp',
+};

packages/blocks/smtp/project.json

@@ -20,6 +20,20 @@
     "lint": {
       "executor": "@nx/eslint:lint",
       "outputs": ["{options.outputFile}"]
+    },
+    "test": {
+      "executor": "@nx/jest:jest",
+      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
+      "options": {
+        "jestConfig": "packages/blocks/smtp/jest.config.ts",
+        "passWithNoTests": true
+      },
+      "configurations": {
+        "ci": {
+          "ci": true,
+          "codeCoverage": true
+        }
+      }
     }
   },
   "tags": []

packages/blocks/smtp/tsconfig.spec.json

@@ -0,0 +1,14 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "../../../dist/out-tsc",
+    "module": "commonjs",
+    "types": ["jest", "node"]
+  },
+  "include": [
+    "jest.config.ts",
+    "src/**/*.test.ts",
+    "src/**/*.spec.ts",
+    "src/**/*.d.ts"
+  ]
+}