fix issue cased by expect file is empty line

demo/sample/1_simple.php

@@ -14,7 +14,7 @@ pid=0
 [esac]
 */
 
-checkStep1() || print(">> expect 1\n");
+checkStep1() || print(">> - expect 1\n");
 checkStep3() || print(">> expect 3\n");
 
 function checkStep1(){}

src/service/testing/ztfCheck.go

@@ -118,7 +118,7 @@ func ValidateStepResult(langType string, expectLines []string, actualLines []str
 			expect = expect[1:len(expect) - 1]
 			pass = stringUtils.MatchString(expect, log, langType)
 		} else {
-			pass = strings.Contains(expect, log)
+			pass = strings.Contains(log, expect)
 		}
 
 		if !pass {