in src/main/java/org/apache/sling/commons/testing/integration/SlingIntegrationTestClient.java [263:270]
public int post(String url, Map<String,String> properties) throws HttpException, IOException {
final PostMethod post = new PostMethod(url);
post.getParams().setContentCharset("UTF-8");
for(Entry<String, String> e : properties.entrySet()) {
post.addParameter(e.getKey(), e.getValue());
}
return httpClient.executeMethod(post);
}