feat: Added setFontSize method unit tests

src/lib/directives/specs/ng2-fittext.directive.spec.ts

@@ -0,0 +1,90 @@
+import { Ng2FittextDirective } from '../ng2-fittext.directive';
+import { Renderer2, ElementRef } from '@angular/core';
+
+describe('Class: Ng2FittextDirective', () => {
+  let ng2FittextDirective: Ng2FittextDirective;
+  let elMock: ElementRef;
+  let rendererMock: Renderer2;
+
+  beforeEach(() => {
+    elMock = {} as ElementRef;
+    rendererMock = {} as Renderer2;
+    ng2FittextDirective = new Ng2FittextDirective(elMock, rendererMock);
+  });
+
+  describe('Method: setFontSize', () => {
+    let newFontSize: number;
+    let isVisibleSpy: jasmine.Spy;
+    let isDoneSpy: jasmine.Spy;
+
+    beforeEach(() => {
+      newFontSize = 100;
+      isVisibleSpy = spyOn(ng2FittextDirective, 'isVisible').and.returnValue(
+        true
+      );
+      isDoneSpy = spyOn(ng2FittextDirective, 'isDone').and.returnValue(false);
+      elMock.nativeElement = {
+        style: {
+          setProperty: () => {},
+        },
+      };
+    });
+
+    it('Should not change the font size if the element is not visible', () => {
+      isVisibleSpy.and.returnValue(false);
+      const previousFontSize: number = ng2FittextDirective.getFontSize();
+      ng2FittextDirective.setFontSize(newFontSize);
+      expect(ng2FittextDirective.getFontSize()).toEqual(previousFontSize);
+    });
+
+    it('Should not change the font size if the fitting operation is done', () => {
+      isDoneSpy.and.returnValue(true);
+      const previousFontSize: number = ng2FittextDirective.getFontSize();
+      ng2FittextDirective.setFontSize(newFontSize);
+      expect(ng2FittextDirective.getFontSize()).toEqual(previousFontSize);
+    });
+
+    it('Should use the minFontSize property value if the specified font size is smaller', () => {
+      const minFontSize: number = ng2FittextDirective.minFontSize;
+      newFontSize = 5;
+      ng2FittextDirective.setFontSize(newFontSize);
+      const currentFontSize: number = ng2FittextDirective.getFontSize();
+      expect(currentFontSize).toEqual(minFontSize);
+    });
+
+    it('Should use the maxFontSize property value if the specified font size is bigger', () => {
+      const maxFontSize: number = ng2FittextDirective.maxFontSize;
+      newFontSize = 1001;
+      ng2FittextDirective.setFontSize(newFontSize);
+      const currentFontSize: number = ng2FittextDirective.getFontSize();
+      expect(currentFontSize).toEqual(maxFontSize);
+    });
+
+    it('Should set a new fontSize value', () => {
+      newFontSize = 500;
+      ng2FittextDirective.setFontSize(newFontSize);
+      const currentFontSize: number = ng2FittextDirective.getFontSize();
+      expect(currentFontSize).toEqual(newFontSize);
+    });
+
+    it('Should emit the font size change', () => {
+      newFontSize = 500;
+      spyOn(ng2FittextDirective.fontSizeChanged, 'emit');
+      ng2FittextDirective.setFontSize(newFontSize);
+      const currentFontSize: number = ng2FittextDirective.getFontSize();
+      expect(ng2FittextDirective.fontSizeChanged.emit).toHaveBeenCalledWith(
+        newFontSize
+      );
+    });
+
+    it('Should update the nativeElement with the new font size', () => {
+      newFontSize = 500;
+      spyOn(ng2FittextDirective.el.nativeElement.style, 'setProperty');
+      ng2FittextDirective.setFontSize(newFontSize);
+      const currentFontSize: number = ng2FittextDirective.getFontSize();
+      expect(
+        ng2FittextDirective.el.nativeElement.style.setProperty
+      ).toHaveBeenCalledWith('font-size', `${newFontSize}px`);
+    });
+  });
+});