CEC-2545 Fix/can signals context (#210)

src/components/Contexts/CANSignalsContext.test.jsx

@@ -0,0 +1,75 @@
+jest.mock("../../services/vehiclesAPI");
+
+import {
+  render,
+  cleanup,
+  screen,
+  fireEvent,
+  waitFor,
+  act,
+} from "@testing-library/react";
+import {CANSignalProvider, useCANSignalContext} from "./CANSignalsContext";
+
+const checkSignalsResults = (filters) => {
+  expect(screen.getByTestId("signals").innerHTML).toEqual(filters);
+};
+
+describe("CANSignalsContext", () => {
+  describe("getSignals", () => {
+    beforeEach(() => {
+      jest.useFakeTimers("setInterval");
+      const TestComp = () => {
+        const { signals, setVIN } = useCANSignalContext();
+
+        return (
+          <>
+            <div data-testid="signals">{JSON.stringify(signals)}</div>
+            <button
+              data-testid="getSignals"
+              onClick={()=>{setVIN("TESTVIN1234567890")}}
+            />
+          </>
+        );
+      };
+      render(
+        <CANSignalProvider>
+          <TestComp />
+        </CANSignalProvider>
+      );
+    });
+
+    afterEach(() => {
+      jest.useRealTimers();
+      cleanup();
+    });
+
+    it("initial state", () => {
+      checkSignalsResults("[]");
+    });
+
+    it("getSignals", async () => {
+      // eslint-disable-next-line testing-library/no-unnecessary-act
+      await act(async () => {
+        fireEvent.click(screen.getByTestId("getSignals"));
+        await waitFor(() =>
+          expect(screen.getByTestId("signals").innerHTML).toBe("[]")
+        );
+        jest.advanceTimersByTime(501);
+      })
+
+      await waitFor(() => {
+        return expect(screen.getByTestId("signals").innerHTML).not.toBe("[]");
+      } );
+
+      checkSignalsResults(JSON.stringify(expectedSignalsData));
+    });
+  });
+});
+
+const expectedSignalsData = [
+  {
+    timestamp: "7/14/2021 8:09:40 PM",
+    signal: "signal",
+    value: 123
+  },
+];