add application service

examples/typescript/ts-step_shotgun_surgery-01_base/src/Application/GetStepDuration.ts

@@ -0,0 +1,14 @@
+import StepId from '../Domain/StepId'
+import StepRepository from '../Domain/StepRepository'
+
+class GetStepDuration {
+    constructor(private repository: StepRepository) {
+    }
+
+    execute(stepId: string): number {
+        const step = this.repository.find(new StepId(stepId))
+        return step.getVideoDuration()
+    }
+}
+
+export default GetStepDuration

examples/typescript/ts-step_shotgun_surgery-01_base/src/Domain/Step.ts

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+import StepId from "./StepId";
+
+class Step {
+    constructor(
+        private id: StepId,
+        private videoDuration: number
+    ) {}
+
+    type(): string {
+        return 'video'
+    }
+
+    getVideoDuration(): number {
+        return this.videoDuration
+    }
+}
+
+export default Step

examples/typescript/ts-step_shotgun_surgery-01_base/src/Domain/StepId.ts

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+class StepId {
+    constructor(private stepId: string) {
+    }
+
+    value(): string {
+        return this.stepId
+    }
+}
+
+export default StepId

examples/typescript/ts-step_shotgun_surgery-01_base/src/Domain/StepRepository.ts

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+import Step from './Step'
+import StepId from './StepId'
+
+interface StepRepository {
+    find(stepId: StepId): Step
+}
+
+export default StepRepository

examples/typescript/ts-step_shotgun_surgery-01_base/tests/Application/GetStepDuration.test.ts

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+import GetStepDuration from '../../src/Application/GetStepDuration';
+import StepId from "../../src/Domain/StepId";
+import Step from "../../src/Domain/Step";
+
+test('should get the video step duration', () => {
+    const stepId = new StepId('stepId')
+    const step = new Step(stepId, 13)
+    const stepRepository = {
+        find: jest.fn((stepId: StepId) => step)
+    }
+    const getStepDuration = new GetStepDuration(stepRepository)
+
+    expect(getStepDuration.execute(stepId.value())).toBe(13)
+});