test: add basic lua/sh test

shell_test.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"testing"
+)
+
+// https://stackoverflow.com/questions/10473800/in-go-how-do-i-capture-stdout-of-a-function-into-a-string
+func TestRunInputSh(t *testing.T) {
+	LuaInit()
+	cmd := "echo 'hello'"
+	old := os.Stdout // keep backup of the real stdout
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+
+	RunInput(cmd)
+
+	outC := make(chan string)
+	// copy the output in a separate goroutine so printing can't block indefinitely
+	go func() {
+		var buf bytes.Buffer
+		io.Copy(&buf, r)
+		outC <- buf.String()
+	}()
+
+	// back to normal state
+	w.Close()
+	os.Stdout = old // restoring the real stdout
+	out := <-outC
+
+	if out != "hello\n" {
+		t.Fatalf("Expected 'hello', found %s", out)
+	}
+}
+
+func TestRunInputLua(t *testing.T) {
+	LuaInit()
+	cmd := "print('hello')"
+	old := os.Stdout // keep backup of the real stdout
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+
+	RunInput(cmd)
+
+	outC := make(chan string)
+	// copy the output in a separate goroutine so printing can't block indefinitely
+	go func() {
+		var buf bytes.Buffer
+		io.Copy(&buf, r)
+		outC <- buf.String()
+	}()
+
+	// back to normal state
+	w.Close()
+	os.Stdout = old // restoring the real stdout
+	out := <-outC
+
+	if out != "hello\n" {
+		t.Fatalf("Expected 'hello', found %s", out)
+	}
+}