diff --git a/pew_test.go b/pew_test.go
new file mode 100644
index 0000000..d0653b0
--- /dev/null
+++ b/pew_test.go
@@ -0,0 +1,44 @@
+// Copyright 2018 Mikhail Klementev. All rights reserved.
+// Use of this source code is governed by a AGPLv3 license
+// (or later) that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestDockerCommand(t *testing.T) {
+	tmp, err := ioutil.TempDir("/tmp/", "out-of-tree_test_")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmp)
+
+	start := time.Now()
+
+	c := dockerCommand("ubuntu", tmp, "1s", "sleep 5s")
+	_, err = c.CombinedOutput()
+	if err == nil {
+		t.Fatal("docker is not killed by timeout")
+	}
+	if time.Since(start) > 3*time.Second {
+		t.Fatal(fmt.Sprintf("timeout failed (%v instead of %v)",
+			time.Since(start), time.Second))
+	}
+
+	c = dockerCommand("ubuntu", tmp, "1m", "echo hello")
+	rawOutput, err := c.CombinedOutput()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if !strings.Contains(string(rawOutput), "hello") {
+		t.Fatal("wrong output (" + string(rawOutput) + ")")
+	}
+}