/
NgComponentAnalyzer.test.ts
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NgComponentAnalyzer.test.ts
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import {
Component,
ComponentFactory,
ComponentFactoryResolver,
Directive,
EventEmitter,
HostBinding,
Injectable,
Input,
Output,
Pipe,
Type,
} from '@angular/core';
import { TestBed } from '@angular/core/testing';
import { BrowserDynamicTestingModule } from '@angular/platform-browser-dynamic/testing';
import {
getComponentInputsOutputs,
isComponent,
isDeclarable,
getComponentDecoratorMetadata,
} from './NgComponentAnalyzer';
describe('getComponentInputsOutputs', () => {
it('should return empty if no I/O found', () => {
@Component({})
class FooComponent {}
expect(getComponentInputsOutputs(FooComponent)).toEqual({
inputs: [],
outputs: [],
});
class BarComponent {}
expect(getComponentInputsOutputs(BarComponent)).toEqual({
inputs: [],
outputs: [],
});
});
it('should return I/O', () => {
@Component({
template: '',
inputs: ['inputInComponentMetadata'],
outputs: ['outputInComponentMetadata'],
})
class FooComponent {
@Input()
public input: string;
@Input('inputPropertyName')
public inputWithBindingPropertyName: string;
@Output()
public output = new EventEmitter<Event>();
@Output('outputPropertyName')
public outputWithBindingPropertyName = new EventEmitter<Event>();
}
const fooComponentFactory = resolveComponentFactory(FooComponent);
const { inputs, outputs } = getComponentInputsOutputs(FooComponent);
expect({ inputs, outputs }).toEqual({
inputs: [
{ propName: 'inputInComponentMetadata', templateName: 'inputInComponentMetadata' },
{ propName: 'input', templateName: 'input' },
{ propName: 'inputWithBindingPropertyName', templateName: 'inputPropertyName' },
],
outputs: [
{ propName: 'outputInComponentMetadata', templateName: 'outputInComponentMetadata' },
{ propName: 'output', templateName: 'output' },
{ propName: 'outputWithBindingPropertyName', templateName: 'outputPropertyName' },
],
});
expect(sortByPropName(inputs)).toEqual(sortByPropName(fooComponentFactory.inputs));
expect(sortByPropName(outputs)).toEqual(sortByPropName(fooComponentFactory.outputs));
});
it("should return I/O when some of component metadata has the same name as one of component's properties", () => {
@Component({
template: '',
inputs: ['input', 'inputWithBindingPropertyName'],
outputs: ['outputWithBindingPropertyName'],
})
class FooComponent {
@Input()
public input: string;
@Input('inputPropertyName')
public inputWithBindingPropertyName: string;
@Output()
public output = new EventEmitter<Event>();
@Output('outputPropertyName')
public outputWithBindingPropertyName = new EventEmitter<Event>();
}
const fooComponentFactory = resolveComponentFactory(FooComponent);
const { inputs, outputs } = getComponentInputsOutputs(FooComponent);
expect(sortByPropName(inputs)).toEqual(sortByPropName(fooComponentFactory.inputs));
expect(sortByPropName(outputs)).toEqual(sortByPropName(fooComponentFactory.outputs));
});
it('should return I/O in the presence of multiple decorators', () => {
@Component({
template: '',
})
class FooComponent {
@Input()
@HostBinding('class.preceeding-first')
public inputPreceedingHostBinding: string;
@HostBinding('class.following-binding')
@Input()
public inputFollowingHostBinding: string;
}
const fooComponentFactory = resolveComponentFactory(FooComponent);
const { inputs, outputs } = getComponentInputsOutputs(FooComponent);
expect({ inputs, outputs }).toEqual({
inputs: [
{ propName: 'inputPreceedingHostBinding', templateName: 'inputPreceedingHostBinding' },
{ propName: 'inputFollowingHostBinding', templateName: 'inputFollowingHostBinding' },
],
outputs: [],
});
expect(sortByPropName(inputs)).toEqual(sortByPropName(fooComponentFactory.inputs));
expect(sortByPropName(outputs)).toEqual(sortByPropName(fooComponentFactory.outputs));
});
it('should return I/O with extending classes', () => {
@Component({
template: '',
})
class BarComponent {
@Input()
public a: string;
@Input()
public b: string;
}
@Component({
template: '',
})
class FooComponent extends BarComponent {
@Input()
public b: string;
@Input()
public c: string;
}
const fooComponentFactory = resolveComponentFactory(FooComponent);
const { inputs, outputs } = getComponentInputsOutputs(FooComponent);
expect({ inputs, outputs }).toEqual({
inputs: [
{ propName: 'a', templateName: 'a' },
{ propName: 'b', templateName: 'b' },
{ propName: 'c', templateName: 'c' },
],
outputs: [],
});
expect(sortByPropName(inputs)).toEqual(sortByPropName(fooComponentFactory.inputs));
expect(sortByPropName(outputs)).toEqual(sortByPropName(fooComponentFactory.outputs));
});
});
describe('isDeclarable', () => {
it('should return true with a Component', () => {
@Component({})
class FooComponent {}
expect(isDeclarable(FooComponent)).toEqual(true);
});
it('should return true with a Directive', () => {
@Directive({})
class FooDirective {}
expect(isDeclarable(FooDirective)).toEqual(true);
});
it('should return true with a Pipe', () => {
@Pipe({ name: 'pipe' })
class FooPipe {}
expect(isDeclarable(FooPipe)).toEqual(true);
});
it('should return false with simple class', () => {
class FooPipe {}
expect(isDeclarable(FooPipe)).toEqual(false);
});
it('should return false with Injectable', () => {
@Injectable()
class FooInjectable {}
expect(isDeclarable(FooInjectable)).toEqual(false);
});
});
describe('isComponent', () => {
it('should return true with a Component', () => {
@Component({})
class FooComponent {}
expect(isComponent(FooComponent)).toEqual(true);
});
it('should return false with simple class', () => {
class FooPipe {}
expect(isComponent(FooPipe)).toEqual(false);
});
it('should return false with Directive', () => {
@Directive()
class FooDirective {}
expect(isComponent(FooDirective)).toEqual(false);
});
});
describe('getComponentDecoratorMetadata', () => {
it('should return Component with a Component', () => {
@Component({ selector: 'foo' })
class FooComponent {}
expect(getComponentDecoratorMetadata(FooComponent)).toBeInstanceOf(Component);
expect(getComponentDecoratorMetadata(FooComponent)).toEqual({
changeDetection: 1,
selector: 'foo',
});
});
it('should return Component with extending classes', () => {
@Component({ selector: 'bar' })
class BarComponent {}
@Component({ selector: 'foo' })
class FooComponent extends BarComponent {}
expect(getComponentDecoratorMetadata(FooComponent)).toBeInstanceOf(Component);
expect(getComponentDecoratorMetadata(FooComponent)).toEqual({
changeDetection: 1,
selector: 'foo',
});
});
});
function sortByPropName(
array: {
propName: string;
templateName: string;
}[]
) {
return array.sort((a, b) => a.propName.localeCompare(b.propName));
}
function resolveComponentFactory<T extends Type<any>>(component: T): ComponentFactory<T> {
TestBed.configureTestingModule({
declarations: [component],
}).overrideModule(BrowserDynamicTestingModule, {
set: {
entryComponents: [component],
},
});
const componentFactoryResolver = TestBed.inject(ComponentFactoryResolver);
return componentFactoryResolver.resolveComponentFactory(component);
}