InvoiceSuccessServiceUnitTest.java

    @Test
    public void testWhenPhoneNumEnteredAndDataExists_thenReturnHttp200() throws Exception {

        String mockPhoneNum = "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);

        this.mockServer.expect(ExpectedCount.once(), requestTo(invoiceUrl
                + mockPhoneNum))
                .andExpect(MockRestRequestMatchers.method(HttpMethod.GET))
                .andRespond(withStatus(HttpStatus.OK)
                        .contentType(MediaType.APPLICATION_JSON)
                        .body(mapper.writeValueAsString(mockInvoiceResponse)));

        responseInvoiceResponseEntity = mockService.getInvoiceInfo(mockPhoneNum);
        mockServer.verify();

        Assert.assertEquals("200",
                responseInvoiceResponseEntity.
                        getStatusCode());

    }