fix IsAlive test

Author: markus-wa

pkg/demoinfocs/common/common_test.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/golang/geo/r3"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
 
 	st "github.com/markus-wa/demoinfocs-golang/v3/pkg/demoinfocs/sendtables"
 	stfake "github.com/markus-wa/demoinfocs-golang/v3/pkg/demoinfocs/sendtables/fake"
@@ -233,6 +234,8 @@ func entityWithProperty(propName string, value st.PropertyValue) *stfake.Entity
 func entityWithProperties(properties []fakeProp) *stfake.Entity {
 	entity := entityWithID(1)
 
+	entity.On("Property", mock.Anything).Return(nil)
+
 	for _, prop := range properties {
 		property := new(stfake.Property)
 		property.On("Value").Return(prop.value)