diff --git a/eqpalg/test/test_algorithms.cc b/eqpalg/test/test_algorithms.cc
index fa6ba78..fc42c9e 100644
--- a/eqpalg/test/test_algorithms.cc
+++ b/eqpalg/test/test_algorithms.cc
@@ -177,9 +177,9 @@ struct TestEnv {
 TEST(logic_alg_trigger_true_produces_alarm) {
     std::map<std::string, double> vars;
     std::vector<std::string> tags = {"tag1"};
-    vars["tag1"] = 1.0;
 
     ExpressionEngine engine(vars, tags);
+    vars["tag1"] = 1.0;  // 必须在构造后设置（构造函数会用共享内存 0.0 覆盖）
     engine.registerExpression("act", "tag1 > 0.5");
 
     // trigger 为 true → 应产生报警
@@ -202,10 +202,10 @@ TEST(logic_alg_trigger_false_no_alarm) {
 TEST(logic_alg_complex_expression) {
     std::map<std::string, double> vars;
     std::vector<std::string> tags = {"tag1", "tag2"};
-    vars["tag1"] = 3.0;
-    vars["tag2"] = 7.0;
 
     ExpressionEngine engine(vars, tags);
+    vars["tag1"] = 3.0;
+    vars["tag2"] = 7.0;
     engine.registerExpression("act", "tag1 > 2 && tag2 < 10");
 
     CHECK_EQ(engine.evaluateBool("act"), true);
@@ -226,10 +226,10 @@ TEST(logic_alg_and_short_circuit_false) {
 TEST(logic_alg_or_expression) {
     std::map<std::string, double> vars;
     std::vector<std::string> tags = {"tag1", "tag2"};
-    vars["tag1"] = 0.0;
-    vars["tag2"] = 100.0;
 
     ExpressionEngine engine(vars, tags);
+    vars["tag1"] = 0.0;
+    vars["tag2"] = 100.0;
     engine.registerExpression("act", "tag1 > 2 || tag2 > 50");
 
     CHECK_EQ(engine.evaluateBool("act"), true);
@@ -378,9 +378,9 @@ TEST(bound_alg_filter_expression) {
 TEST(bound_alg_filter_boundary) {
     std::map<std::string, double> vars;
     std::vector<std::string> tags = {"tag1"};
-    vars["tag1"] = 200.0;
 
     ExpressionEngine engine(vars, tags);
+    vars["tag1"] = 200.0;
     engine.registerExpression("feedback", "tag1 >= 200");
 
     // exactly at boundary
@@ -454,13 +454,13 @@ TEST(bound_hold_long_delay) {
 TEST(feedback_full_flow_start_to_done) {
     std::map<std::string, double> vars;
     std::vector<std::string> tags = {"tag1"};
-    vars["tag1"] = 1.0;
+
+    ExpressionEngine engine(vars, tags);
+    vars["tag1"] = 1.0;  // 必须在构造后设置（构造函数覆盖）
     vars["p1"] = 1.0;
     vars["now"] = 0;
     vars["stime"] = 0;
     vars["time"] = 0;
-
-    ExpressionEngine engine(vars, tags);
     engine.registerExpression("act", "tag1 > 0.5");
     engine.registerExpression("feedback", "tag1 < 0.1");
     engine.registerExpression("result", "1");
@@ -568,9 +568,9 @@ TEST(feedback_timeout_scenario) {
 TEST(exp_times_occurrence_counting_logic) {
     std::map<std::string, double> vars;
     std::vector<std::string> tags = {"tag1"};
-    vars["tag1"] = 1.0;
 
     ExpressionEngine engine(vars, tags);
+    vars["tag1"] = 1.0;  // 必须在构造后设置
     engine.registerExpression("act", "tag1");
 
     int shear_times = 0;
@@ -590,9 +590,9 @@ TEST(exp_times_occurrence_counting_logic) {
 TEST(exp_times_occurrence_below_threshold) {
     std::map<std::string, double> vars;
     std::vector<std::string> tags = {"tag1"};
-    vars["tag1"] = 1.0;
 
     ExpressionEngine engine(vars, tags);
+    vars["tag1"] = 1.0;  // 必须在构造后设置
     engine.registerExpression("act", "tag1 > 0.5");
 
     int shear_times = 0;