test attachHandler

1 files changed, 27 insertions, 0 deletions

diff --git a/gui_test.go b/gui_test.go
new file mode 100644
index 0000000..584544a
--- /dev/null
+++ b/gui_test.go
@@ -0,0 +1,27 @@
+package gui
+
+import "time"
+
+const timeout = 1 * time.Second
+
+// trySend returns true if v can be sent to c within timeout, or false otherwise.
+func trySend[T any](c chan<- T, v T, timeout time.Duration) bool {
+	timer := time.NewTimer(timeout)
+	select {
+	case c <- v:
+		return true
+	case <-timer.C:
+		return false
+	}
+}
+
+// tryRecv returns the value received from c, or false if no value is received within timeout.
+func tryRecv[T any](c <-chan T, timeout time.Duration) (*T, bool) {
+	timer := time.NewTimer(timeout)
+	select {
+	case v := <-c:
+		return &v, true
+	case <-timer.C:
+		return nil, false
+	}
+}