feat: support post json

examples/postman_echo/hardcode_test.go

@@ -32,6 +32,12 @@ func TestCaseHardcode(t *testing.T) {
 				WithParams(map[string]interface{}{"foo1": "bar1", "foo2": "bar2"}).
 				Validate().
 				AssertEqual("status_code", 200, "check status code"),
+			httpboomer.Step("post json data").
+				POST("/post").
+				WithHeaders(map[string]string{"User-Agent": "HttpBoomer"}).
+				WithJSON(map[string]interface{}{"foo1": "bar1", "foo2": "bar2"}).
+				Validate().
+				AssertEqual("status_code", 200, "check status code"),
 			httpboomer.Step("put request").
 				PUT("/put").
 				WithHeaders(map[string]string{"User-Agent": "HttpBoomer", "Content-Type": "text/plain"}).

runner.go

@@ -59,6 +59,7 @@ func (r *Runner) runStep(step *TStep) error {
 	v = append(v, req.Header(step.Request.Headers))
 	v = append(v, req.Param(step.Request.Params))
 	v = append(v, step.Request.Data)
+	v = append(v, req.BodyJSON(step.Request.JSON))
 
 	for cookieName, cookieValue := range step.Request.Cookies {
 		v = append(v, &http.Cookie{