package tools

import "testing"

// The Windows half of the shell choice, testable on every platform because it
// is arithmetic on strings. The exec.Cmd it feeds is compiled with GOOS=windows
// and has never been run by this project's authors — see README.md.

func TestWindowsShellIsComspecOrCmd(t *testing.T) {
	if got := windowsShell(`C:\Windows\system32\cmd.exe`); got != `C:\Windows\system32\cmd.exe` {
		t.Errorf("windowsShell(COMSPEC) = %q, want COMSPEC itself", got)
	}
	if got := windowsShell(""); got != "cmd.exe" {
		t.Errorf("windowsShell(\"\") = %q, want cmd.exe", got)
	}
}

func TestCmdExeGetsTheCommandVerbatimInsideOnePairOfQuotes(t *testing.T) {
	// cmd.exe /S /C strips the first and last quote and parses the rest by its
	// own rules, so a quote inside the command must reach it as a quote and
	// not as the C runtime's \".
	got := cmdExeCommandLine(`C:\Windows\system32\cmd.exe`, `echo "hello world" && go test ./...`)

	want := `"C:\Windows\system32\cmd.exe" /S /C "echo "hello world" && go test ./..."`
	if got != want {
		t.Errorf("cmdExeCommandLine() = %s, want %s", got, want)
	}
}

func TestTheShellRunsOneCommandLineAndExits(t *testing.T) {
	// Whatever the platform, the arguments end with the command itself, which
	// is what lets the terminal package compose the line.
	args := ShellArgs("go test ./...")

	if len(args) < 2 || args[len(args)-1] != "go test ./..." {
		t.Errorf("ShellArgs() = %q, want the command as the last argument after the shell's switch", args)
	}
	if Shell() == "" {
		t.Error("Shell() is empty")
	}
}