add watcher_test.go

Author: johnsaigle

node/pkg/watchers/watchers_test.go

@@ -0,0 +1,34 @@
+package watchers
+
+import (
+	"slices"
+	"testing"
+
+	"github.com/wormhole-foundation/wormhole/sdk/vaa"
+)
+
+func TestRegisterRPCURL(t *testing.T) {
+	rpcURLsMu.Lock()
+	rpcURLs = map[vaa.ChainID][]string{}
+	rpcURLsMu.Unlock()
+
+	RegisterRPCURL(vaa.ChainIDEthereum, "")
+	if urls := RPCURLs(vaa.ChainIDEthereum); urls != nil {
+		t.Fatalf("expected empty URLs to be ignored, got %v", urls)
+	}
+
+	RegisterRPCURL(vaa.ChainIDEthereum, "https://eth.example")
+	RegisterRPCURL(vaa.ChainIDEthereum, "https://eth.example")
+	RegisterRPCURL(vaa.ChainIDEthereum, "https://eth-backup.example")
+
+	urls := RPCURLs(vaa.ChainIDEthereum)
+	want := []string{"https://eth.example", "https://eth-backup.example"}
+	if !slices.Equal(urls, want) {
+		t.Fatalf("unexpected URLs: got %v, want %v", urls, want)
+	}
+
+	urls[0] = "https://mutated.example"
+	if got := RPCURLs(vaa.ChainIDEthereum); !slices.Equal(got, want) {
+		t.Fatalf("RPCURLs returned mutable backing storage: got %v, want %v", got, want)
+	}
+}