HTTP Unit Testing
When writing unit tests using this HTTP framework, don’t make requests to a real server. Instead,
mock the HTTP transport and inject fake HTTP requests and responses. The
pluggable HTTP transport layer
of the Google HTTP Client Library for Java makes this
flexible and simple to do.
Also, some useful testing utilities are included in the
com.google.api.client.testing.http
package (
@Beta
).
The following simple example generates a basic
HttpResponse
:
HttpTransport
transport
=
new
MockHttpTransport
();
HttpRequest
request
=
transport
.
createRequestFactory
().
buildGetRequest
(
HttpTesting
.
SIMPLE_GENERIC_URL
);
HttpResponse
response
=
request
.
execute
();
The following example shows how to override the implementation of the
MockHttpTransport
class:
HttpTransport
transport
=
new
MockHttpTransport
()
{
@Override
public
LowLevelHttpRequest
buildRequest
(
String
method
,
String
url
)
throws
IOException
{
return
new
MockLowLevelHttpRequest
()
{
@Override
public
LowLevelHttpResponse
execute
()
throws
IOException
{
MockLowLevelHttpResponse
response
=
new
MockLowLevelHttpResponse
();
response
.
addHeader
(
"custom_header"
,
"value"
);
response
.
setStatusCode
(
404
);
response
.
setContentType
(
Json
.
MEDIA_TYPE
);
response
.
setContent
(
"{\"error\":\"not found\"}"
);
return
response
;
}
};
}
};
HttpRequest
request
=
transport
.
createRequestFactory
().
buildGetRequest
(
HttpTesting
.
SIMPLE_GENERIC_URL
);
HttpResponse
response
=
request
.
execute
();
For more examples, see the
HttpResponseTest.java
and
HttpRequestTest.java
files.
