test: add tests for jerm log package

internal/log/log_test.go

@@ -0,0 +1,74 @@
+package log
+
+import (
+	"io"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestInfoLog(t *testing.T) {
+	assert := assert.New(t)
+
+	r, w, stdout := pipeStd(t)
+	Info("testing")
+	w.Close()
+	out, _ := io.ReadAll(r)
+	os.Stdout = stdout
+
+	assert.Contains(string(out), "INFO testing\n")
+}
+
+func TestDebugLog(t *testing.T) {
+	assert := assert.New(t)
+
+	r, w, stdout := pipeStd(t)
+	Debug("testing")
+	w.Close()
+	out, _ := io.ReadAll(r)
+	os.Stdout = stdout
+	assert.NotContains(string(out), "DEBUG testing\n")
+
+	os.Setenv("JERM_VERBOSE", "1")
+	r, w, stdout = pipeStd(t)
+	Debug("testing")
+	w.Close()
+	out, _ = io.ReadAll(r)
+	os.Stdout = stdout
+	assert.Contains(string(out), "DEBUG testing\n")
+}
+
+func TestWarnLog(t *testing.T) {
+	assert := assert.New(t)
+
+	r, w, stdout := pipeStd(t)
+	Warn("testing")
+	w.Close()
+	out, _ := io.ReadAll(r)
+	os.Stdout = stdout
+
+	assert.Contains(string(out), "WARN testing\n")
+}
+
+func TestErrorLog(t *testing.T) {
+	assert := assert.New(t)
+
+	r, w, stdout := pipeStd(t)
+	Error("testing")
+	w.Close()
+	out, _ := io.ReadAll(r)
+	os.Stdout = stdout
+
+	assert.Contains(string(out), "ERROR testing\n")
+}
+
+func pipeStd(t *testing.T) (r, w, stdout *os.File) {
+	stdout = os.Stdout
+	r, w, err := os.Pipe()
+	if err != nil {
+		t.Fatal(err)
+	}
+	os.Stdout = w
+	return
+}