From f77169052ff8ac056e4732a7f4bee73766867027 Mon Sep 17 00:00:00 2001
From: Nickbing Lao <giscafer@outlook.com>
Date: Mon, 15 Apr 2019 17:20:58 +0800
Subject: [PATCH] fix(module:steps): updateChildrenSteps bug (#3194)

close #3193
---
 components/steps/nz-steps.component.ts |  4 ++-
 components/steps/nz-steps.spec.ts      | 48 +++++++++++++++++++++++++-
 2 files changed, 50 insertions(+), 2 deletions(-)

diff --git a/components/steps/nz-steps.component.ts b/components/steps/nz-steps.component.ts
index 038146afaee..44af336e36c 100644
--- a/components/steps/nz-steps.component.ts
+++ b/components/steps/nz-steps.component.ts
@@ -80,7 +80,9 @@ export class NzStepsComponent implements OnChanges, OnInit, OnDestroy, AfterCont
   ngAfterContentInit(): void {
     this.updateChildrenSteps();
     if (this.steps) {
-      this.steps.changes.pipe(takeUntil(this.destroy$)).subscribe(this.updateChildrenSteps);
+      this.steps.changes.pipe(takeUntil(this.destroy$)).subscribe(() => {
+        this.updateChildrenSteps();
+      });
     }
   }
 
diff --git a/components/steps/nz-steps.spec.ts b/components/steps/nz-steps.spec.ts
index 047e1b13279..25bbecdd046 100644
--- a/components/steps/nz-steps.spec.ts
+++ b/components/steps/nz-steps.spec.ts
@@ -3,6 +3,7 @@ import {
   ChangeDetectorRef,
   Component,
   DebugElement,
+  OnInit,
   TemplateRef,
   ViewChild
 } from '@angular/core';
@@ -23,7 +24,8 @@ describe('steps', () => {
         NzTestOuterStepsComponent,
         NzTestInnerStepStringComponent,
         NzTestInnerStepTemplateComponent,
-        NzTestStepForComponent
+        NzTestStepForComponent,
+        NzTestStepAsyncComponent
       ]
     });
     TestBed.compileComponents();
@@ -337,6 +339,28 @@ describe('steps', () => {
       comp.detectChanges();
     });
   });
+  describe('step async assign steps', () => {
+    it('should allow steps assigned asynchronously', fakeAsync(() => {
+      const fixture: ComponentFixture<NzTestStepAsyncComponent> = TestBed.createComponent(NzTestStepAsyncComponent);
+      let innerSteps: DebugElement[];
+
+      fixture.detectChanges();
+      innerSteps = fixture.debugElement.queryAll(By.directive(NzStepComponent));
+      expect(innerSteps.length).toBe(0);
+
+      tick(1000);
+      fixture.detectChanges();
+      tick();
+      innerSteps = fixture.debugElement.queryAll(By.directive(NzStepComponent));
+      fixture.detectChanges();
+      expect(innerSteps.length).toBe(3);
+      expect(innerSteps[0].nativeElement.className).toBe('ant-steps-item ant-steps-item-finish');
+      expect(innerSteps[1].nativeElement.className).toBe('ant-steps-item ant-steps-item-process');
+      expect(innerSteps[0].nativeElement.querySelector('.ant-steps-icon').innerText.trim()).toBe('');
+      expect(innerSteps[1].nativeElement.querySelector('.ant-steps-icon').innerText.trim()).toBe('2');
+      expect(innerSteps[2].nativeElement.querySelector('.ant-steps-icon').innerText.trim()).toBe('3');
+    }));
+  });
 });
 
 @Component({
@@ -432,3 +456,25 @@ export class NzTestStepForComponent {
     this.steps.push(4);
   }
 }
+
+@Component({
+  selector: 'nz-test-step-async',
+  template: `
+    <nz-steps [nzCurrent]="1">
+      <nz-step *ngFor="let step of steps; trackBy: trackById"></nz-step>
+    </nz-steps>
+  `
+})
+export class NzTestStepAsyncComponent implements OnInit {
+  steps: number[] = [];
+
+  trackById(index: number): number {
+    return index;
+  }
+
+  ngOnInit(): void {
+    setTimeout(() => {
+      this.steps = [1, 2, 3];
+    }, 1000);
+  }
+}