Initial commit: logcorrelator with unified packaging (DEB + RPM using fpm)

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

internal/observability/logger_test.go

@@ -0,0 +1,111 @@
+package observability
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestNewLogger(t *testing.T) {
+	logger := NewLogger("test")
+	if logger == nil {
+		t.Fatal("expected non-nil logger")
+	}
+	if logger.prefix != "test" {
+		t.Errorf("expected prefix 'test', got %s", logger.prefix)
+	}
+}
+
+func TestLogger_Info(t *testing.T) {
+	// Capture stderr
+	oldStderr := os.Stderr
+	r, w, _ := os.Pipe()
+	os.Stderr = w
+
+	logger := NewLogger("test")
+	logger.Info("test message")
+
+	w.Close()
+	os.Stderr = oldStderr
+
+	var buf bytes.Buffer
+	io.Copy(&buf, r)
+	output := buf.String()
+
+	if !strings.Contains(output, "INFO") {
+		t.Error("expected INFO in output")
+	}
+	if !strings.Contains(output, "test message") {
+		t.Error("expected 'test message' in output")
+	}
+}
+
+func TestLogger_Error(t *testing.T) {
+	oldStderr := os.Stderr
+	r, w, _ := os.Pipe()
+	os.Stderr = w
+
+	logger := NewLogger("test")
+	logger.Error("error message", nil)
+
+	w.Close()
+	os.Stderr = oldStderr
+
+	var buf bytes.Buffer
+	io.Copy(&buf, r)
+	output := buf.String()
+
+	if !strings.Contains(output, "ERROR") {
+		t.Error("expected ERROR in output")
+	}
+	if !strings.Contains(output, "error message") {
+		t.Error("expected 'error message' in output")
+	}
+}
+
+func TestLogger_Debug(t *testing.T) {
+	oldStderr := os.Stderr
+	r, w, _ := os.Pipe()
+	os.Stderr = w
+
+	logger := NewLogger("test")
+	logger.Debug("debug message")
+
+	w.Close()
+	os.Stderr = oldStderr
+
+	var buf bytes.Buffer
+	io.Copy(&buf, r)
+	output := buf.String()
+
+	if !strings.Contains(output, "DEBUG") {
+		t.Error("expected DEBUG in output")
+	}
+	if !strings.Contains(output, "debug message") {
+		t.Error("expected 'debug message' in output")
+	}
+}
+
+func TestLogger_WithFields(t *testing.T) {
+	logger := NewLogger("test")
+	fieldsLogger := logger.WithFields(map[string]any{
+		"key1": "value1",
+		"key2": 42,
+	})
+
+	if fieldsLogger == logger {
+		t.Error("expected different logger instance")
+	}
+	if len(fieldsLogger.fields) != 2 {
+		t.Errorf("expected 2 fields, got %d", len(fieldsLogger.fields))
+	}
+}
+
+func TestLogger_Name(t *testing.T) {
+	logger := NewLogger("myservice")
+	if logger.prefix != "myservice" {
+		t.Errorf("expected prefix 'myservice', got %s", logger.prefix)
+	}
+}