Fix static check tests. (#3005)

* Ignore U1001 check in test files.

* Add test for ClaimableBalancesQueryURITemplate.

* Remove demo and example from internal txnbuild package.

* Fix static checks.

services/horizon/internal/actions/claimable_balance_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/stellar/go/support/errors"
 	"github.com/stellar/go/support/render/problem"
 	"github.com/stellar/go/xdr"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestGetClaimableBalanceByID(t *testing.T) {
@@ -530,3 +531,10 @@ func TestGetClaimableBalances(t *testing.T) {
 	// 	)
 	// }
 }
+
+func TestClaimableBalancesQueryURLTemplate(t *testing.T) {
+	tt := assert.New(t)
+	expected := "/claimable_balances?{asset,claimant,sponsor}"
+	q := ClaimableBalancesQuery{}
+	tt.Equal(expected, q.URITemplate())
+}

services/horizon/internal/expingest/processors/claimable_balances_processor_test.go

@@ -1,3 +1,4 @@
+//lint:file-ignore U1001 Ignore all unused code, staticcheck doesn't understand testify/suite
 package processors
 
 import (

services/horizon/internal/expingest/processors/transaction_operation_wrapper_test.go

@@ -1,3 +1,4 @@
+//lint:file-ignore U1001 Ignore all unused code, staticcheck doesn't understand testify/suite
 package processors
 
 import (

services/horizon/internal/test/integration.go

@@ -325,23 +325,6 @@ func (i *IntegrationTest) CreateAccounts(count int) ([]*keypair.Full, []txnbuild
 	return pairs, accounts
 }
 
-// Establishes a trustline for a given asset for a particular account.
-//
-// Note: The function panics if this account doesn't exist in the ledger yet, so
-// be sure to fund it before doing this.
-func (i *IntegrationTest) EstablishTrustline(
-	truster *keypair.Full, asset txnbuild.Asset,
-) (proto.Transaction, error) {
-	request := sdk.AccountRequest{AccountID: truster.Address()}
-	account, err := i.Client().AccountDetail(request)
-	panicIf(err)
-
-	return i.SubmitOperations(&account, truster, &txnbuild.ChangeTrust{
-		Line:  asset,
-		Limit: "2000",
-	})
-}
-
 // Submits a signed transaction from an account with standard options.
 //
 // Namely, we set the standard fee, time bounds, etc. to "non-production"

services/horizon/internal/txnbuild/begin_sponsoring_future_reserves.go

@@ -1,3 +1,4 @@
+//lint:file-ignore U1001 Ignore all unused code, staticcheck doesn't understand testify/suite
 package txnbuild
 
 import (

services/horizon/internal/txnbuild/claim_claimable_balance.go

@@ -1,3 +1,4 @@
+//lint:file-ignore U1001 Ignore all unused code, staticcheck doesn't understand testify/suite
 package txnbuild
 
 import (