internal/pkg/wrapper/invocation_test.go

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package wrapper

import (
	"bytes"
	"context"
	"os"
	"syscall"
	"testing"
	"time"

	_ "github.com/bazelbuild/rsclient/internal/pkg/testsetup"
)

// TestRunSuccess verifies that a simple command runs successfully and its output is captured.
func TestRunSuccess(t *testing.T) {
	var stdout bytes.Buffer
	inv := Invocation{
		Command:      []string{"echo", "hello"},
		SignalPolicy: PolicyRelay,
		Stdout:       &stdout,
		BaseEnv:      []string{},
	}
	exitCode := inv.Run(context.Background())
	if exitCode != 0 {
		t.Errorf("expected exit code 0, got %d", exitCode)
	}
	if got := stdout.String(); got != "hello\n" {
		t.Errorf("expected stdout \"hello\\n\", got %q", got)
	}
}

// TestRunFailure verifies that a failing command returns a non-zero exit code.
func TestRunFailure(t *testing.T) {
	inv := Invocation{
		Command:      []string{"false"},
		SignalPolicy: PolicyRelay,
		BaseEnv:      []string{},
	}
	exitCode := inv.Run(context.Background())
	if exitCode != 1 {
		t.Errorf("expected exit code 1, got %d", exitCode)
	}
}

// TestRunSignalForwardingRelay verifies that signals sent to the Sigs channel
// are correctly forwarded to the child process in PolicyRelay mode.
func TestRunSignalForwardingRelay(t *testing.T) {
	// 'sleep' will wait for a signal.
	// We'll send it a SIGTERM.
	sigs := make(chan os.Signal, 1)
	inv := Invocation{
		Command:      []string{"sleep", "10"},
		SignalPolicy: PolicyRelay,
		Sigs:         sigs,
		BaseEnv:      []string{},
	}

	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
	defer cancel()

	done := make(chan int)
	go func() {
		done <- inv.Run(ctx)
	}()

	// Give it a moment to start.
	time.Sleep(100 * time.Millisecond)
	sigs <- syscall.SIGTERM

	select {
	case exitCode := <-done:
		// When a process is terminated by a signal, Wait() returns an error,
		// and our Run implementation returns -1.
		if exitCode != -1 {
			t.Errorf("expected exit code -1 after signal termination, got %d", exitCode)
		}
	case <-ctx.Done():
		t.Fatal("timed out waiting for command to exit after signal")
	}
}

// TestPopulateSystemDefaults verifies that the helper function correctly
// fills missing fields with standard system values.
func TestPopulateSystemDefaults(t *testing.T) {
	inv := Invocation{}
	inv.PopulateSystemDefaults()

	if inv.Stdout != os.Stdout {
		t.Errorf("expected Stdout to be os.Stdout")
	}
	if inv.Stderr != os.Stderr {
		t.Errorf("expected Stderr to be os.Stderr")
	}
	if inv.SignalPolicy != PolicyRelay {
		t.Errorf("expected SignalPolicy to be %q, got %q", PolicyRelay, inv.SignalPolicy)
	}
	if inv.BaseEnv == nil {
		t.Errorf("expected BaseEnv to be populated")
	}
}

type customSignal struct{}

func (s customSignal) String() string { return "custom" }
func (s customSignal) Signal()        {}

// TestRun_NonSyscallSignal verifies that receiving a non-syscall signal
// does not cause a panic and is simply ignored for forwarding.
func TestRun_NonSyscallSignal(t *testing.T) {
	sigs := make(chan os.Signal, 1)
	inv := Invocation{
		Command:      []string{"echo", "hi"},
		SignalPolicy: PolicyRelay,
		Sigs:         sigs,
		BaseEnv:      []string{},
	}

	// Send a signal that does not implement syscall.Signal.
	sigs <- customSignal{}

	// Run should finish successfully without panicking.
	exitCode := inv.Run(context.Background())
	if exitCode != 0 {
		t.Errorf("expected exit code 0, got %d", exitCode)
	}
}