add(server/v1/tests): Port many of the v2 HTTP handler tests to v1

This should cover most aspects of the v1 API but being new to the etcd
code base I cannot promise that or that the tests are even correct.
They do pass though :)

server/v1/tests/delete_handler_test.go

@@ -0,0 +1,31 @@
+package v1
+
+import (
+	"fmt"
+	"net/http"
+	"net/url"
+	"testing"
+
+	"github.com/coreos/etcd/server"
+	"github.com/coreos/etcd/tests"
+	"github.com/coreos/etcd/third_party/github.com/stretchr/testify/assert"
+)
+
+// Ensures that a key is deleted.
+//
+//   $ curl -X PUT localhost:4001/v1/keys/foo/bar -d value=XXX
+//   $ curl -X DELETE localhost:4001/v1/keys/foo/bar
+//
+func TestV1DeleteKey(t *testing.T) {
+	tests.RunServer(func(s *server.Server) {
+		v := url.Values{}
+		v.Set("value", "XXX")
+		resp, err := tests.PutForm(fmt.Sprintf("%s%s", s.URL(), "/v1/keys/foo/bar"), v)
+		tests.ReadBody(resp)
+		resp, err = tests.DeleteForm(fmt.Sprintf("%s%s", s.URL(), "/v1/keys/foo/bar"), url.Values{})
+		assert.Equal(t, resp.StatusCode, http.StatusOK)
+		body := tests.ReadBody(resp)
+		assert.Nil(t, err, "")
+		assert.Equal(t, string(body), `{"action":"delete","key":"/foo/bar","prevValue":"XXX","index":3}`, "")
+	})
+}