diff --git a/server/response_test.go b/server/response_test.go
new file mode 100644
index 0000000..df8a94f
--- /dev/null
+++ b/server/response_test.go
@@ -0,0 +1,75 @@
+package server
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"gopkg.in/mgo.v2/bson"
+)
+
+func TestResponse(t *testing.T) {
+	cases := map[string]struct {
+		foo    func(*REST, http.ResponseWriter)
+		body   string
+		status int
+	}{
+		"OK": {
+			foo: func(rest *REST, w http.ResponseWriter) {
+				rest.respOK(w)
+			},
+			body:   `{"ok":true}`,
+			status: http.StatusOK,
+		},
+		"not found": {
+			foo: func(rest *REST, w http.ResponseWriter) {
+				rest.respNotFound(w)
+			},
+			body:   `{"error":"not found"}`,
+			status: http.StatusNotFound,
+		},
+		"conflict": {
+			foo: func(rest *REST, w http.ResponseWriter) {
+				rest.respConflict(w)
+			},
+			body:   `{"error":"collision found"}`,
+			status: http.StatusConflict,
+		},
+		"error": {
+			foo: func(rest *REST, w http.ResponseWriter) {
+				rest.respError(w, errors.New("my err"))
+			},
+			body:   `{"error":"my err"}`,
+			status: http.StatusInternalServerError,
+		},
+		"bad req": {
+			foo: func(rest *REST, w http.ResponseWriter) {
+				rest.respBadRequest(w, "bad dog")
+			},
+			body:   `{"error":"bad dog"}`,
+			status: http.StatusBadRequest,
+		},
+	}
+
+	for name, d := range cases {
+		c := d
+		t.Run(name, func(t *testing.T) {
+			rest := &REST{}
+			w := httptest.NewRecorder()
+			c.foo(rest, w)
+			if w.Code != c.status {
+				t.Fatalf("want status %d, got %d", c.status, w.Code)
+			}
+			var m bson.M
+			if err := json.NewDecoder(w.Body).Decode(&m); err != nil {
+				t.Fatal(err)
+			}
+			body, _ := json.Marshal(m)
+			if s := string(body); s != c.body {
+				t.Fatalf("want body %q, got %q", c.body, s)
+			}
+		})
+	}
+}