refactor remaining methods into separate methods for improved testing

src/loaders/ApiBasedRepositoryLoader.ts

@@ -137,85 +137,100 @@ export class ApiBasedRepositoryLoader {
     }
   }
 
-  public async fetchAndUpdateShuttleDataForExistingSystems() {
+  public async fetchAndUpdateShuttleDataForExistingSystemsInRepository() {
     const systems = await this.repository.getSystems();
     await Promise.all(systems.map(async (system: ISystem) => {
-      const params = {
-        getBuses: "2"
-      };
-
-      const formDataJsonObject = {
-        "s0": system.id,
-        "sA": "1"
-      };
-
-      const formData = new FormData();
-      formData.set("json", JSON.stringify(formDataJsonObject));
-
-      const query = new URLSearchParams(params).toString();
-      const response = await fetch(`${this.baseUrl}?${query}`, {
-        method: "POST",
-        body: formData,
-      });
-      const json = await response.json();
-
-      if (json.buses && json.buses["-1"] === undefined) {
-        const jsonBuses = Object.values(json.buses).map((busesArr: any) => {
-          return busesArr[0];
-        });
-
-        await Promise.all(jsonBuses.map(async (jsonBus: any) => {
-          const constructedShuttle: IShuttle = {
-            name: jsonBus.bus,
-            coordinates: {
-              latitude: parseFloat(jsonBus.latitude),
-              longitude: parseFloat(jsonBus.longitude),
-            },
-            routeId: jsonBus.routeId,
-            systemId: system.id,
-            id: `${jsonBus.busId}`
-          }
-
-          await this.repository.addOrUpdateShuttle(constructedShuttle);
-        }))
-      }
+      const systemId = system.id;
+      await this.fetchAndUpdateShuttleDataForSystemId(systemId);
     }));
   }
 
-  public async fetchAndUpdateEtaDataForExistingOrderedStops() {
+  public async fetchAndUpdateShuttleDataForSystemId(systemId: string) {
+    const params = {
+      getBuses: "2"
+    };
+
+    const formDataJsonObject = {
+      "s0": systemId,
+      "sA": "1"
+    };
+
+    const formData = new FormData();
+    formData.set("json", JSON.stringify(formDataJsonObject));
+
+    const query = new URLSearchParams(params).toString();
+    const response = await fetch(`${this.baseUrl}?${query}`, {
+      method: "POST",
+      body: formData,
+    });
+    const json = await response.json();
+
+    if (json.buses && json.buses["-1"] === undefined) {
+      const jsonBuses = Object.values(json.buses).map((busesArr: any) => {
+        return busesArr[0];
+      });
+
+      await Promise.all(jsonBuses.map(async (jsonBus: any) => {
+        const constructedShuttle: IShuttle = {
+          name: jsonBus.bus,
+          coordinates: {
+            latitude: parseFloat(jsonBus.latitude),
+            longitude: parseFloat(jsonBus.longitude),
+          },
+          routeId: jsonBus.routeId,
+          systemId: systemId,
+          id: `${jsonBus.busId}`
+        }
+
+        await this.repository.addOrUpdateShuttle(constructedShuttle);
+      }))
+    }
+  }
+
+  public async fetchAndUpdateEtaDataForExistingStopsForSystemsInRepository() {
     const systems = await this.repository.getSystems()
     await Promise.all(systems.map(async (system: ISystem) => {
-      const stops = await this.repository.getStopsBySystemId(system.id);
-      await Promise.all(stops.map(async (stop) => {
-        const params = {
-          eta: "3",
-          stopIds: stop.id,
+      const systemId = system.id;
+      await this.fetchAndUpdateEtaDataForExistingStopsForSystemId(systemId);
+    }))
+  }
+
+  public async fetchAndUpdateEtaDataForExistingStopsForSystemId(systemId: string) {
+    const stops = await this.repository.getStopsBySystemId(systemId);
+    await Promise.all(stops.map(async (stop) => {
+      let stopId = stop.id;
+      await this.fetchAndUpdateEtaDataForStopId(stopId);
+    }));
+  }
+
+  public async fetchAndUpdateEtaDataForStopId(stopId: string) {
+    const params = {
+      eta: "3",
+      stopIds: stopId,
+    };
+
+    const query = new URLSearchParams(params).toString();
+    const response = await fetch(`${this.baseUrl}?${query}`, {
+      method: "GET",
+    });
+    const json = await response.json();
+
+    if (json.ETAs && json.ETAs[stopId]) {
+      // Continue with the parsing
+      json.ETAs[stopId].forEach((jsonEta: any) => {
+        // Update cache
+        const shuttleId: string = jsonEta.busId;
+
+        const eta: IEta = {
+          secondsRemaining: jsonEta.secondsSpent,
+          shuttleId: `${shuttleId}`,
+          stopId: stopId,
+          millisecondsSinceEpoch: Date.now(),
         };
 
-        const query = new URLSearchParams(params).toString();
-        const response = await fetch(`${this.baseUrl}?${query}`, {
-          method: "GET",
-        });
-        const json = await response.json();
-
-        if (json.ETAs && json.ETAs[stop.id]) {
-          // Continue with the parsing
-          json.ETAs[stop.id].forEach((jsonEta: any) => {
-            // Update cache
-            const shuttleId: string = jsonEta.busId;
-
-            const eta: IEta = {
-              secondsRemaining: jsonEta.secondsSpent,
-              shuttleId: `${shuttleId}`,
-              stopId: stop.id,
-              millisecondsSinceEpoch: Date.now(),
-            };
-
-            this.repository.addOrUpdateEta(eta);
-          });
-        }
-      }));
-    }))
+        this.repository.addOrUpdateEta(eta);
+      });
+    }
   }
 
   protected async updateStopDataForSystemAndApiResponse(systemId: string, json: any) {