diff --git a/script/test b/script/test
index e9479e2945..b297812c13 100755
--- a/script/test
+++ b/script/test
@@ -1,4 +1,12 @@
 #!/bin/sh
 set -e
+
+ARGS=$@
+if [ -z "$ARGS" ]; then
+    ARGS="./..."
+fi
+
+echo $ARGS
+
 docker build -t docker-machine .
-exec docker run --rm docker-machine go test -v -short ./...
+exec docker run --rm docker-machine godep go test -v -short $ARGS
diff --git a/utils/b2d_test.go b/utils/b2d_test.go
new file mode 100644
index 0000000000..d4b585bf78
--- /dev/null
+++ b/utils/b2d_test.go
@@ -0,0 +1 @@
+package utils
diff --git a/utils/certs_test.go b/utils/certs_test.go
new file mode 100644
index 0000000000..d4b585bf78
--- /dev/null
+++ b/utils/certs_test.go
@@ -0,0 +1 @@
+package utils
diff --git a/utils/utils.go b/utils/utils.go
index 39e4b24c7f..fb4bd17126 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -7,14 +7,17 @@ import (
 	"runtime"
 )
 
+func GetHomeDir() string {
+	if runtime.GOOS == "windows" {
+		return os.Getenv("USERPROFILE")
+	}
+	return os.Getenv("HOME")
+}
+
 func GetBaseDir() string {
 	baseDir := os.Getenv("MACHINE_DIR")
 	if baseDir == "" {
-		if runtime.GOOS == "windows" {
-			baseDir = os.Getenv("USERPROFILE")
-		} else {
-			baseDir = os.Getenv("HOME")
-		}
+		baseDir = GetHomeDir()
 	}
 	return baseDir
 }
diff --git a/utils/utils_test.go b/utils/utils_test.go
new file mode 100644
index 0000000000..e94fc223a7
--- /dev/null
+++ b/utils/utils_test.go
@@ -0,0 +1,144 @@
+package utils
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+func TestGetBaseDir(t *testing.T) {
+	homeDir := GetHomeDir()
+	baseDir := GetBaseDir()
+
+	if strings.Index(homeDir, baseDir) != 0 {
+		t.Fatalf("expected base dir with prefix %s; received %s", homeDir, baseDir)
+	}
+}
+
+func TestGetCustomBaseDir(t *testing.T) {
+	root := "/tmp"
+	os.Setenv("MACHINE_DIR", root)
+	baseDir := GetBaseDir()
+
+	if strings.Index(root, baseDir) != 0 {
+		t.Fatalf("expected base dir with prefix %s; received %s", root, baseDir)
+	}
+}
+
+func TestGetDockerDir(t *testing.T) {
+	root := "/tmp"
+	os.Setenv("MACHINE_DIR", root)
+	dockerDir := GetDockerDir()
+
+	if strings.Index(dockerDir, root) != 0 {
+		t.Fatalf("expected docker dir with prefix %s; received %s", root, dockerDir)
+	}
+
+	path, filename := path.Split(dockerDir)
+	if strings.Index(path, root) != 0 {
+		t.Fatalf("expected base path of %s; received %s", root, path)
+	}
+	if filename != ".docker" {
+		t.Fatalf("expected docker dir \".docker\"; received %s", filename)
+	}
+}
+
+func TestGetMachineDir(t *testing.T) {
+	root := "/tmp"
+	os.Setenv("MACHINE_DIR", root)
+	machineDir := GetMachineDir()
+
+	if strings.Index(machineDir, root) != 0 {
+		t.Fatalf("expected machine dir with prefix %s; received %s", root, machineDir)
+	}
+
+	path, filename := path.Split(machineDir)
+	if strings.Index(path, root) != 0 {
+		t.Fatalf("expected base path of %s; received %s", root, path)
+	}
+	if filename != "machines" {
+		t.Fatalf("expected machine dir \"machines\"; received %s", filename)
+	}
+}
+
+func TestGetMachineClientCertDir(t *testing.T) {
+	root := "/tmp"
+	os.Setenv("MACHINE_DIR", root)
+	clientDir := GetMachineClientCertDir()
+
+	if strings.Index(clientDir, root) != 0 {
+		t.Fatalf("expected machine client cert dir with prefix %s; received %s", root, clientDir)
+	}
+
+	path, filename := path.Split(clientDir)
+	if strings.Index(path, root) != 0 {
+		t.Fatalf("expected base path of %s; received %s", root, path)
+	}
+	if filename != ".client" {
+		t.Fatalf("expected machine client dir \".client\"; received %s", filename)
+	}
+}
+
+func TestCopyFile(t *testing.T) {
+	testStr := "test-machine"
+
+	srcFile, err := ioutil.TempFile("", "machine-test-")
+	if err != nil {
+		t.Fatal(err)
+	}
+	srcFi, err := srcFile.Stat()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	srcFile.Write([]byte(testStr))
+	srcFile.Close()
+
+	srcFilePath := filepath.Join(os.TempDir(), srcFi.Name())
+
+	destFile, err := ioutil.TempFile("", "machine-copy-test-")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	destFi, err := destFile.Stat()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	destFile.Close()
+
+	destFilePath := filepath.Join(os.TempDir(), destFi.Name())
+
+	if err := CopyFile(srcFilePath, destFilePath); err != nil {
+		t.Fatal(err)
+	}
+
+	data, err := ioutil.ReadFile(destFilePath)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if string(data) != testStr {
+		t.Fatalf("expected data \"%s\"; received \"%\"", testStr, string(data))
+	}
+}
+
+func TestGetUsername(t *testing.T) {
+	currentUser := "unknown"
+	switch runtime.GOOS {
+	case "darwin,linux":
+		currentUser = os.Getenv("USER")
+	case "windows":
+		currentUser = os.Getenv("USERNAME")
+	}
+
+	username := GetUsername()
+	if username != currentUser {
+		t.Fatalf("expected username %s; received %s", currentUser, username)
+	}
+}