Begin adding syncapi component tests (#2442)

* Add very basic syncapi tests

* Add a way to inject jetstream messages

* implement add_state_ids

* bugfixes

* Unbreak tests

* Remove now un-needed API call

* Linting

test/http.go

@@ -0,0 +1,45 @@
+package test
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/url"
+	"testing"
+)
+
+type HTTPRequestOpt func(req *http.Request)
+
+func WithJSONBody(t *testing.T, body interface{}) HTTPRequestOpt {
+	t.Helper()
+	b, err := json.Marshal(body)
+	if err != nil {
+		t.Fatalf("WithJSONBody: %s", err)
+	}
+	return func(req *http.Request) {
+		req.Body = io.NopCloser(bytes.NewBuffer(b))
+	}
+}
+
+func WithQueryParams(qps map[string]string) HTTPRequestOpt {
+	var vals url.Values = map[string][]string{}
+	for k, v := range qps {
+		vals.Set(k, v)
+	}
+	return func(req *http.Request) {
+		req.URL.RawQuery = vals.Encode()
+	}
+}
+
+func NewRequest(t *testing.T, method, path string, opts ...HTTPRequestOpt) *http.Request {
+	t.Helper()
+	req, err := http.NewRequest(method, "http://localhost"+path, nil)
+	if err != nil {
+		t.Fatalf("failed to make new HTTP request %v %v : %v", method, path, err)
+	}
+	for _, o := range opts {
+		o(req)
+	}
+	return req
+}