test: exec binary from within tea.Program

exec_test.go

@@ -0,0 +1,48 @@
+package tea
+
+import (
+	"bytes"
+	"os/exec"
+	"testing"
+)
+
+type execFinishedMsg struct{ err error }
+type testExecModel struct{ err error }
+
+func (m testExecModel) Init() Cmd {
+	c := exec.Command("true") //nolint:gosec
+	return ExecProcess(c, func(err error) Msg {
+		return execFinishedMsg{err}
+	})
+}
+
+func (m *testExecModel) Update(msg Msg) (Model, Cmd) {
+	switch msg := msg.(type) {
+	case execFinishedMsg:
+		if msg.err != nil {
+			m.err = msg.err
+		}
+		return m, Quit
+	}
+
+	return m, nil
+}
+
+func (m *testExecModel) View() string {
+	return "\n"
+}
+
+func TestTeaExec(t *testing.T) {
+	var buf bytes.Buffer
+	var in bytes.Buffer
+
+	m := &testExecModel{}
+	p := NewProgram(m, WithInput(&in), WithOutput(&buf))
+	if err := p.Start(); err != nil {
+		t.Fatal(err)
+	}
+
+	if m.err != nil {
+		t.Fatal(m.err)
+	}
+}