diff --git a/main_test.go b/main_test.go
index a809dc9..002d28b 100644
--- a/main_test.go
+++ b/main_test.go
@@ -427,6 +427,114 @@ func TestDropdownSurfaceOriginKeepsMenusWithinVisibleArea(t *testing.T) {
 	}
 }
 
+func TestBuildSyncMenuModelForUnboundVault(t *testing.T) {
+	t.Parallel()
+
+	u := newUIWithModel("desktop", vault.Model{
+		Entries: []vault.Entry{
+			{ID: "mint-ledger", Title: "Mint Ledger"},
+		},
+	})
+	u.state.Section = appstate.SectionEntries
+
+	model := u.buildSyncMenuModel()
+	if !model.showRemoteSyncSetupShortcut() {
+		t.Fatal("model.showRemoteSyncSetupShortcut() = false, want true for an unbound open vault")
+	}
+	if model.showDirectRemoteSyncShortcut() {
+		t.Fatal("model.showDirectRemoteSyncShortcut() = true, want false without a saved binding")
+	}
+	if got := model.actionLabels(); !slices.Equal(got, []string{"Open Advanced Sync", "Set Up Remote Sync"}) {
+		t.Fatalf("model.actionLabels() = %v, want [Open Advanced Sync Set Up Remote Sync]", got)
+	}
+}
+
+func TestBuildSyncMenuModelForBoundVault(t *testing.T) {
+	t.Parallel()
+
+	u := newUIWithModel("desktop", vault.Model{
+		Entries: []vault.Entry{
+			{
+				ID:       "mint-credential",
+				Title:    "Mint Credentials",
+				Username: "verbal-kint",
+			},
+		},
+		RemoteProfiles: []vault.RemoteProfile{
+			{
+				ID:      "mint-profile",
+				Name:    "Downtown Mint",
+				Backend: vault.RemoteBackendWebDAV,
+				BaseURL: "https://mint.example.invalid/remote.php/dav",
+				Path:    "/files/kint/mint.kdbx",
+			},
+		},
+	})
+	u.state.Section = appstate.SectionEntries
+	u.selectedVaultRemoteProfileID = "mint-profile"
+	u.selectedVaultRemoteCredentialEntryID = "mint-credential"
+	u.selectedVaultRemoteSyncMode = appstate.SyncModeAutomaticOnOpenSave
+
+	model := u.buildSyncMenuModel()
+	if model.showRemoteSyncSetupShortcut() {
+		t.Fatal("model.showRemoteSyncSetupShortcut() = true, want false for a bound vault")
+	}
+	if !model.showDirectRemoteSyncShortcut() {
+		t.Fatal("model.showDirectRemoteSyncShortcut() = false, want true for a bound vault")
+	}
+	if !model.showRemoteSyncSettingsShortcut() {
+		t.Fatal("model.showRemoteSyncSettingsShortcut() = false, want true for a bound vault")
+	}
+	if !model.showRemoveRemoteSyncShortcut() {
+		t.Fatal("model.showRemoveRemoteSyncShortcut() = false, want true for a bound vault")
+	}
+	summary := model.savedBindingSummary
+	if !summary.ok {
+		t.Fatal("model.savedBindingSummary.ok = false, want true")
+	}
+	if summary.profileLabel != "Downtown Mint" {
+		t.Fatalf("model.savedBindingSummary.profileLabel = %q, want Downtown Mint", summary.profileLabel)
+	}
+	if summary.credentialLabel != "Mint Credentials · verbal-kint" {
+		t.Fatalf("model.savedBindingSummary.credentialLabel = %q, want Mint Credentials · verbal-kint", summary.credentialLabel)
+	}
+	if summary.syncLabel != "Syncs automatically on open and save." {
+		t.Fatalf("model.savedBindingSummary.syncLabel = %q, want automatic-sync summary", summary.syncLabel)
+	}
+}
+
+func TestBuildSyncMenuModelShowsSaveCurrentBindingOnlyWithCompleteRemoteInput(t *testing.T) {
+	t.Parallel()
+
+	u := newUIWithModel("desktop", vault.Model{
+		Entries: []vault.Entry{
+			{ID: "mint-ledger", Title: "Mint Ledger"},
+		},
+	})
+	u.state.Section = appstate.SectionEntries
+
+	model := u.buildSyncMenuModel()
+	if model.showSaveCurrentBinding {
+		t.Fatal("model.showSaveCurrentBinding = true, want false without remote input")
+	}
+
+	u.remoteBaseURL.SetText("https://mint.example.invalid/remote.php/dav")
+	u.remotePath.SetText("/files/kint/mint.kdbx")
+	u.remoteUsername.SetText("verbal-kint")
+	u.remotePassword.SetText("kobayashi")
+
+	model = u.buildSyncMenuModel()
+	if !model.showSaveCurrentBinding {
+		t.Fatal("model.showSaveCurrentBinding = false, want true with complete remote input")
+	}
+	if got := model.saveCurrentRemoteBindingHeading(); got != "Bind this local vault to the current remote target" {
+		t.Fatalf("model.saveCurrentRemoteBindingHeading() = %q, want vault binding guidance", got)
+	}
+	if got := model.saveCurrentRemoteBindingButtonLabel(); got != "Save Remote In Vault" {
+		t.Fatalf("model.saveCurrentRemoteBindingButtonLabel() = %q, want Save Remote In Vault", got)
+	}
+}
+
 func TestUICurrentVaultSummary(t *testing.T) {
 	t.Parallel()