added test files

pkg/logger/logger_test.go

@@ -0,0 +1,27 @@
+package logger
+
+import (
+	"testing"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func TestInitializeZapGlobals_InfoLevel(t *testing.T) {
+	initializeZapGlobals("info")
+
+	if zap.L().Core().Enabled(zapcore.DebugLevel) {
+		t.Error("debug level should be disabled when LOG_LEVEL is info")
+	}
+	if !zap.L().Core().Enabled(zapcore.InfoLevel) {
+		t.Error("info level should be enabled")
+	}
+}
+
+func TestInitializeZapGlobals_DebugLevel(t *testing.T) {
+	initializeZapGlobals("debug")
+
+	if !zap.L().Core().Enabled(zapcore.DebugLevel) {
+		t.Error("debug level should be enabled")
+	}
+}