add wiretrustee LOGIN command (#90)

* feature: add wiretrustee LOGIN command

* chore: add management initial connection timeout

* test: add login cmd test

* test: validate generated config in login cmd

* test: add up command test

* chore: add timeout to signal client creation method

* test: close wireguard interface once test finished

client/cmd/login_test.go

@@ -0,0 +1,68 @@
+package cmd
+
+import (
+	"fmt"
+	"github.com/wiretrustee/wiretrustee/client/internal"
+	"github.com/wiretrustee/wiretrustee/iface"
+	mgmt "github.com/wiretrustee/wiretrustee/management/server"
+	"github.com/wiretrustee/wiretrustee/util"
+	"path/filepath"
+	"testing"
+)
+
+var mgmAddr string
+
+func TestLogin_Start(t *testing.T) {
+	config := &mgmt.Config{}
+	_, err := util.ReadJson("../testdata/management.json", config)
+	if err != nil {
+		t.Fatal(err)
+	}
+	testDir := t.TempDir()
+	config.Datadir = testDir
+	err = util.CopyFileContents("../testdata/store.json", filepath.Join(testDir, "store.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, listener := startManagement(config, t)
+	mgmAddr = listener.Addr().String()
+}
+
+func TestLogin(t *testing.T) {
+
+	tempDir := t.TempDir()
+	confPath := tempDir + "/config.json"
+	mgmtURL := fmt.Sprintf("http://%s", mgmAddr)
+	rootCmd.SetArgs([]string{
+		"login",
+		"--config",
+		confPath,
+		"--setup-key",
+		"a2c8e62b-38f5-4553-b31e-dd66c696cebb",
+		"--management-url",
+		mgmtURL,
+	})
+	err := rootCmd.Execute()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// validate generated config
+	actualConf := &internal.Config{}
+	_, err = util.ReadJson(confPath, actualConf)
+	if err != nil {
+		t.Errorf("expected proper config file written, got broken %v", err)
+	}
+
+	if actualConf.ManagementURL.String() != mgmtURL {
+		t.Errorf("expected management URL %s got %s", mgmtURL, actualConf.ManagementURL.String())
+	}
+
+	if actualConf.WgIface != iface.WgInterfaceDefault {
+		t.Errorf("expected WgIface %s got %s", iface.WgInterfaceDefault, actualConf.WgIface)
+	}
+
+	if len(actualConf.PrivateKey) == 0 {
+		t.Errorf("expected non empty Private key, got empty")
+	}
+}