Success case of Invoice Controller

InvoiceSuccessControllerUnitTest.java

    @Test
    public void testWhenPhoneNumEnteredAndDataExists_thenReturnHttp200() throws Exception {

        final String mockPhoneNumber = "534*******";

        final FileInputStream fileInputStream = new FileInputStream(ResourceUtils.getFile("classpath:response_http200.json"));
        final String staticResponse = StreamUtils.copyToString(fileInputStream, Charset.defaultCharset());

        InvoiceResponse mockInvoiceResponse = mapper.readValue(staticResponse, InvoiceResponse.class);

        when(invoiceService.getInvoiceInfo(mockPhoneNumber))
                .thenReturn(mockInvoiceResponse);

        mockMvc.perform(get("/invoiceQuery/{phoneNumber}", mockPhoneNumber))
                .andExpect(jsonPath("$.statusCode", is("200")));

    }