Contribuyendo con requerimiento 4: filtrado de explorers por un stack determinado

.gitignore

@@ -1 +1,2 @@
-node_modules
+node_modules  
+package.json  

lib/controllers/ExplorerController.js

@@ -21,6 +21,12 @@ class ExplorerController{
         const explorers = Reader.readJsonFile("explorers.json");
         return ExplorerService.getAmountOfExplorersByMission(explorers, mission);
     }
+
+    static getExplorersByStack(stack){
+        const explorers = Reader.readJsonFile("./explorers.json");
+        const explorersByStack = ExplorerService.getExplorerByStack(explorers, stack);
+        return explorersByStack;
+    }
 }
 
 module.exports = ExplorerController;

lib/server.js

@@ -32,6 +32,13 @@ app.get("/v1/fizzbuzz/:score", (request, response) => {
     response.json({score: score, trick: fizzbuzzTrick});
 });
 
+app.get("/v1/explorers/stack/:stack", (request, response) => {
+    const stack = request.params.stack;
+    const explorersByStack = ExplorerController.getExplorersByStack(stack);
+
+    response.json(explorersByStack);
+});
+
 app.listen(port, () => {
     console.log(`FizzBuzz API in localhost:${port}`);
 });

lib/services/ExplorerService.js

@@ -16,6 +16,10 @@ class ExplorerService {
         return explorersUsernames;
     }
 
+    static getExplorerByStack(explorers, stack){
+        const ExplorersByStack = explorers.filter((explorer) => explorer.stacks.includes(stack));
+        return ExplorersByStack;
+    }
 }
 
 module.exports = ExplorerService;

test/controllers/ExplorerController.test.js

@@ -0,0 +1,8 @@
+const ExplorerController = require("./../../lib/controllers/ExplorerController");
+
+describe("Pruebas de unidad de la clase ExplorerController", () => {
+    test("Requerimiento 4: Obtener lista de explorers que contengan el stack", () => {
+        const explorersByStack = ExplorerController.getExplorersByStack("javascript");
+        expect(explorersByStack.length).toBe(11);
+    });
+});

test/services/ExplorerService.test.js

@@ -7,4 +7,13 @@ describe("Tests para ExplorerService", () => {
         expect(explorersInNode.length).toBe(1);
     });
 
+    test("Requerimiento 4: Filtrar explorers por stack", () => {
+        const explorers = [
+            {name: "Explorer1", stacks: ["elixir", "javascript"]},
+            {name: "Explorer2", stacks: ["elixir"]},
+            {name: "Explorer3", stacks: ["javascript"]}
+        ];
+        const ExplorersByStack = ExplorerService.getExplorerByStack(explorers, "elixir");
+        expect(ExplorersByStack.length).toBe(2);
+    });
 });