Test conn (#199)

* test: add conn tests

* test: add ConnStatus tests

* test: add error test

* test: add more conn tests

client/internal/peer/error_test.go

@@ -0,0 +1,27 @@
+package peer
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+	"time"
+)
+
+func TestNewConnectionClosedError(t *testing.T) {
+	err := NewConnectionClosedError("X")
+	assert.Equal(t, &ConnectionClosedError{peer: "X"}, err)
+}
+
+func TestNewConnectionDisconnectedError(t *testing.T) {
+	err := NewConnectionDisconnectedError("X")
+	assert.Equal(t, &ConnectionDisconnectedError{peer: "X"}, err)
+}
+
+func TestNewConnectionTimeoutErrorC(t *testing.T) {
+	err := NewConnectionTimeoutError("X", time.Second)
+	assert.Equal(t, &ConnectionTimeoutError{peer: "X", timeout: time.Second}, err)
+}
+
+func TestNewConnectionAlreadyClosed(t *testing.T) {
+	err := NewConnectionAlreadyClosed("X")
+	assert.Equal(t, &ConnectionAlreadyClosedError{peer: "X"}, err)
+}