misc: add Version

Closes #22.

misc.go

@@ -0,0 +1,23 @@
+// Copyright 2013 Francisco Souza. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package docker
+
+import (
+	"encoding/json"
+	"github.com/dotcloud/docker"
+)
+
+func (c *Client) Version() (*docker.APIVersion, error) {
+	body, _, err := c.do("GET", "/version", nil)
+	if err != nil {
+		return nil, err
+	}
+	var version docker.APIVersion
+	err = json.Unmarshal(body, &version)
+	if err != nil {
+		return nil, err
+	}
+	return &version, nil
+}

misc_test.go

@@ -0,0 +1,62 @@
+// Copyright 2013 Francisco Souza. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package docker
+
+import (
+	"github.com/dotcloud/docker"
+	"net/http"
+	"net/url"
+	"reflect"
+	"testing"
+)
+
+func TestVersion(t *testing.T) {
+	body := `{
+     "Version":"0.2.2",
+     "GitCommit":"5a2a5cc+CHANGES",
+     "GoVersion":"go1.0.3"
+}`
+	fakeRT := FakeRoundTripper{message: body, status: http.StatusOK}
+	client := Client{
+		endpoint: "http://localhost:4243/",
+		client:   &http.Client{Transport: &fakeRT},
+	}
+	expected := docker.APIVersion{
+		Version:   "0.2.2",
+		GitCommit: "5a2a5cc+CHANGES",
+		GoVersion: "go1.0.3",
+	}
+	version, err := client.Version()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !reflect.DeepEqual(*version, expected) {
+		t.Errorf("Version(): Wrong result. Want %#v. Got %#v.", expected, version)
+	}
+	req := fakeRT.requests[0]
+	if req.Method != "GET" {
+		t.Errorf("Version(): wrong request method. Want GET. Got %s.", req.Method)
+	}
+	u, _ := url.Parse(client.getURL("/version"))
+	if req.URL.Path != u.Path {
+		t.Errorf("Version(): wrong request path. Want %q. Got %q.", u.Path, req.URL.Path)
+	}
+}
+
+func TestVersionError(t *testing.T) {
+	client := Client{
+		endpoint: "http://localhost:4242",
+		client: &http.Client{
+			Transport: &FakeRoundTripper{message: "internal error", status: http.StatusInternalServerError},
+		},
+	}
+	version, err := client.Version()
+	if version != nil {
+		t.Errorf("Version(): expected <nil> value, got %#v.", version)
+	}
+	if err == nil {
+		t.Error("Version(): unexpected <nil> error")
+	}
+}