test: add common check test

Author: mengzhuo

vmdetect/common_test.go

@@ -0,0 +1,10 @@
+package vmdetect
+
+import "testing"
+
+func TestCommonCheck(t *testing.T) {
+	inVM, msg := CommonChecks()
+	if inVM && msg != "nothing" {
+		t.Errorf("inside vm but got %s, expect else", msg)
+	}
+}