feat(statistics): display some stats in the logs (#337)

* test: add more coverage

* docs: reorder and enhance typo

* docs(contributing): add more information about the npm scripts

* feat(statistics): add simple statistics

* feat(statistics): add more stats

* refactor(issues-processor): remove some options from the constructor

it should have been only useful for the tests

* feat(statistics): add stats for new stale or undo stale issues

* chore(rebase): handle rebase conflicts

__tests__/any-of-labels.spec.ts

@@ -1,6 +1,6 @@
 import {Issue} from '../src/classes/issue';
-import {IssuesProcessor} from '../src/classes/issues-processor';
 import {IIssuesProcessorOptions} from '../src/interfaces/issues-processor-options';
+import {IssuesProcessorMock} from './classes/issues-processor-mock';
 import {DefaultProcessorOptions} from './constants/default-processor-options';
 import {generateIssue} from './functions/generate-issue';
 
@@ -95,8 +95,8 @@ class IssuesProcessorBuilder {
     return this;
   }
 
-  build(): IssuesProcessor {
-    return new IssuesProcessor(
+  build(): IssuesProcessorMock {
+    return new IssuesProcessorMock(
       this._options,
       async () => 'abot',
       async p => (p === 1 ? this._issues : []),

__tests__/assignees.spec.ts

@@ -1,6 +1,6 @@
 import {Issue} from '../src/classes/issue';
-import {IssuesProcessor} from '../src/classes/issues-processor';
 import {IIssuesProcessorOptions} from '../src/interfaces/issues-processor-options';
+import {IssuesProcessorMock} from './classes/issues-processor-mock';
 import {DefaultProcessorOptions} from './constants/default-processor-options';
 import {generateIssue} from './functions/generate-issue';
 
@@ -21,7 +21,7 @@ interface ITestData {
 describe('assignees options', (): void => {
   let opts: IIssuesProcessorOptions;
   let testIssueList: Issue[];
-  let processor: IssuesProcessor;
+  let processor: IssuesProcessorMock;
 
   const setTestIssueList = (
     isPullRequest: boolean,
@@ -46,7 +46,7 @@ describe('assignees options', (): void => {
   };
 
   const setProcessor = () => {
-    processor = new IssuesProcessor(
+    processor = new IssuesProcessorMock(
       opts,
       async () => 'abot',
       async p => (p === 1 ? testIssueList : []),

__tests__/classes/issues-processor-mock.ts

@@ -0,0 +1,38 @@
+import {Issue} from '../../src/classes/issue';
+import {IssuesProcessor} from '../../src/classes/issues-processor';
+import {IComment} from '../../src/interfaces/comment';
+import {IIssuesProcessorOptions} from '../../src/interfaces/issues-processor-options';
+
+export class IssuesProcessorMock extends IssuesProcessor {
+  constructor(
+    options: IIssuesProcessorOptions,
+    getActor?: () => Promise<string>,
+    getIssues?: (page: number) => Promise<Issue[]>,
+    listIssueComments?: (
+      issueNumber: number,
+      sinceDate: string
+    ) => Promise<IComment[]>,
+    getLabelCreationDate?: (
+      issue: Issue,
+      label: string
+    ) => Promise<string | undefined>
+  ) {
+    super(options);
+
+    if (getActor) {
+      this.getActor = getActor;
+    }
+
+    if (getIssues) {
+      this.getIssues = getIssues;
+    }
+
+    if (listIssueComments) {
+      this.listIssueComments = listIssueComments;
+    }
+
+    if (getLabelCreationDate) {
+      this.getLabelCreationDate = getLabelCreationDate;
+    }
+  }
+}

__tests__/constants/default-processor-options.ts

@@ -41,5 +41,6 @@ export const DefaultProcessorOptions: IIssuesProcessorOptions = Object.freeze({
   exemptPrAssignees: '',
   exemptAllAssignees: false,
   exemptAllIssueAssignees: undefined,
-  exemptAllPrAssignees: undefined
+  exemptAllPrAssignees: undefined,
+  enableStatistics: false
 });