add simple api tests

Signed-off-by: Victor Vieux <vieux@docker.com>

api/api_test.go

@@ -0,0 +1,43 @@
+package api
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/docker/swarm/cluster"
+	"github.com/docker/swarm/scheduler"
+	"github.com/stretchr/testify/assert"
+)
+
+func serveRequest(c *cluster.Cluster, s *scheduler.Scheduler, w http.ResponseWriter, req *http.Request) error {
+	context := &context{
+		cluster:   c,
+		scheduler: s,
+		version:   "test-version",
+	}
+
+	r, err := createRouter(context, false)
+	if err != nil {
+		return err
+	}
+	r.ServeHTTP(w, req)
+	return nil
+}
+
+func TestGetVersion(t *testing.T) {
+	r := httptest.NewRecorder()
+	req, err := http.NewRequest("GET", "/version", nil)
+	assert.NoError(t, err)
+
+	assert.NoError(t, serveRequest(nil, nil, r, req))
+	assert.Equal(t, r.Code, http.StatusOK)
+
+	version := struct {
+		Version string
+	}{}
+
+	json.NewDecoder(r.Body).Decode(&version)
+	assert.Equal(t, version.Version, "swarm/test-version")
+}