Add tests

fakeroot_test.go

@@ -0,0 +1,59 @@
+package fakeroot_test
+
+import (
+	"errors"
+	"os/exec"
+	"syscall"
+	"testing"
+
+	"lure.sh/fakeroot"
+)
+
+func TestCommand(t *testing.T) {
+	cmd, err := fakeroot.Command("whoami")
+	if err != nil {
+		t.Errorf("Unexpected error while creating command: %q", err)
+	}
+
+	data, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Errorf("Unexpected error while executing command: %q", err)
+	}
+	if sdata := string(data); sdata != "root\n" {
+		t.Errorf("Expected %q, got %q", "root\n", sdata)
+	}
+}
+
+func TestCommandUIDError(t *testing.T) {
+	cmd := exec.Command("whoami")
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		UidMappings: []syscall.SysProcIDMap{
+			{
+				ContainerID: 0,
+				HostID:      1000,
+				Size:        1,
+			},
+		},
+	}
+	err := fakeroot.Apply(cmd)
+	if !errors.Is(err, fakeroot.ErrRootUIDAlreadyMapped) {
+		t.Errorf("Expected error %q, got %q", fakeroot.ErrRootUIDAlreadyMapped, err)
+	}
+}
+
+func TestCommandGIDError(t *testing.T) {
+	cmd := exec.Command("whoami")
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		GidMappings: []syscall.SysProcIDMap{
+			{
+				ContainerID: 0,
+				HostID:      1000,
+				Size:        1,
+			},
+		},
+	}
+	err := fakeroot.Apply(cmd)
+	if !errors.Is(err, fakeroot.ErrRootGIDAlreadyMapped) {
+		t.Errorf("Expected error %q, got %q", fakeroot.ErrRootGIDAlreadyMapped, err)
+	}
+}