feat: condition evaluator for rule filtering

internal/condition/evaluator_test.go

@@ -0,0 +1,56 @@
+package condition
+
+import (
+	"testing"
+
+	"aiaa-notification-service/internal/model"
+)
+
+func TestEvaluate_Empty(t *testing.T) {
+	if !Evaluate(nil, nil) {
+		t.Error("empty conditions should pass")
+	}
+}
+
+func TestEvaluate_Exists(t *testing.T) {
+	conds := []model.Condition{{Field: "symbol", Op: "exists"}}
+	data := map[string]interface{}{"symbol": "BTC"}
+	if !Evaluate(conds, data) {
+		t.Error("symbol exists, should pass")
+	}
+}
+
+func TestEvaluate_NotExists(t *testing.T) {
+	conds := []model.Condition{{Field: "symbol", Op: "not_exists"}}
+	data := map[string]interface{}{"price": 100}
+	if !Evaluate(conds, data) {
+		t.Error("symbol not exists, should pass")
+	}
+}
+
+func TestEvaluate_Gt(t *testing.T) {
+	conds := []model.Condition{{Field: "price", Op: "gt", Value: "100"}}
+	data := map[string]interface{}{"price": float64(200)}
+	if !Evaluate(conds, data) {
+		t.Error("200 > 100, should pass")
+	}
+}
+
+func TestEvaluate_Fail(t *testing.T) {
+	conds := []model.Condition{
+		{Field: "symbol", Op: "exists"},
+		{Field: "price", Op: "lt", Value: "100"},
+	}
+	data := map[string]interface{}{"symbol": "BTC", "price": float64(200)}
+	if Evaluate(conds, data) {
+		t.Error("200 < 100 is false, should fail")
+	}
+}
+
+func TestEvaluate_Contains(t *testing.T) {
+	conds := []model.Condition{{Field: "msg", Op: "contains", Value: "error"}}
+	data := map[string]interface{}{"msg": "connection error occurred"}
+	if !Evaluate(conds, data) {
+		t.Error("msg contains 'error', should pass")
+	}
+}