Fix sonar issues and added one more test case

src/commands/pretty.ts

@@ -7,16 +7,16 @@ import { ValidationError } from '../core/errors/validation-error';
 import { prettyFlags } from '../core/flags/pretty.flags';
 
 export default class Pretty extends Command {
-  static description = 'Format AsyncAPI specification file';
+  static readonly description = 'Format AsyncAPI specification file';
 
-  static examples = [
+  static readonly examples = [
     'asyncapi pretty ./asyncapi.yaml',
     'asyncapi pretty ./asyncapi.yaml --output formatted-asyncapi.yaml',
   ];
 
-  static flags = prettyFlags();
+  static readonly flags = prettyFlags();
 
-  static args = {
+  static readonly args = {
     'spec-file': Args.string({description: 'spec path, url, or context-name', required: true}),
   };
 

test/integration/pretty.test.ts

@@ -4,6 +4,7 @@ import { expect } from '@oclif/test';
 
 const testHelper = new TestHelper();
 const badFormatPath = './test/fixtures/asyncapi_v1.yml';
+const validFormatPath = './test/fixtures/asyncapiValid_v1.yml';
 
 describe('pretty', () => {
   describe('with file paths', () => {
@@ -34,5 +35,17 @@ describe('pretty', () => {
         expect(ctx.stderr).to.equal('');
         done();
       });
+
+    test
+      .stderr()
+      .stdout()
+      .command(['pretty', badFormatPath ,'-o', validFormatPath])
+      .it('should log the information file has been beautified', (ctx, done) => {
+        expect(ctx.stdout).to.contain(
+          `Asyncapi document has been beautified ${validFormatPath}`,
+        );
+        expect(ctx.stderr).to.equal('');
+        done();
+      });
   });
 });