r/aws_route: Change 'finder.RouteTable' to 'finder.RouteTables' to su…

…pport data source returning multiple route tables.

Acceptance test output:

$ make testacc TEST=./aws TESTARGS='-run=TestAccAWSRoute_basic\|TestAccAWSRoute_disappears' ACCTEST_PARALLELISM=2
==> Checking that code complies with gofmt requirements...
TF_ACC=1 go test ./aws -v -count 1 -parallel 2 -run=TestAccAWSRoute_basic\|TestAccAWSRoute_disappears -timeout 120m
=== RUN   TestAccAWSRoute_basic
=== PAUSE TestAccAWSRoute_basic
=== RUN   TestAccAWSRoute_disappears
=== PAUSE TestAccAWSRoute_disappears
=== RUN   TestAccAWSRoute_disappears_RouteTable
=== PAUSE TestAccAWSRoute_disappears_RouteTable
=== CONT  TestAccAWSRoute_basic
=== CONT  TestAccAWSRoute_disappears_RouteTable
--- PASS: TestAccAWSRoute_disappears_RouteTable (33.82s)
=== CONT  TestAccAWSRoute_disappears
--- PASS: TestAccAWSRoute_basic (35.39s)
--- PASS: TestAccAWSRoute_disappears (31.99s)
PASS
ok  	github.com/terraform-providers/terraform-provider-aws/aws	65.901s

aws/internal/service/ec2/finder/finder.go

@@ -84,10 +84,18 @@ func RouteTableByID(conn *ec2.EC2, routeTableID string) (*ec2.RouteTable, error)
 		RouteTableIds: aws.StringSlice([]string{routeTableID}),
 	}
 
-	return RouteTable(conn, input)
+	routeTables, err := RouteTables(conn, input)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return routeTables[0], nil
 }
 
-func RouteTable(conn *ec2.EC2, input *ec2.DescribeRouteTablesInput) (*ec2.RouteTable, error) {
+// RouteTables returns the route tables corresponding to the specified input.
+// Returns NotFoundError if no route tables are found.
+func RouteTables(conn *ec2.EC2, input *ec2.DescribeRouteTablesInput) ([]*ec2.RouteTable, error) {
 	output, err := conn.DescribeRouteTables(input)
 
 	if tfawserr.ErrCodeEquals(err, tfec2.ErrCodeInvalidRouteTableIDNotFound) {
@@ -109,7 +117,7 @@ func RouteTable(conn *ec2.EC2, input *ec2.DescribeRouteTablesInput) (*ec2.RouteT
 		}
 	}
 
-	return output.RouteTables[0], nil
+	return output.RouteTables, nil
 }
 
 // RouteFinder returns the route corresponding to the specified destination.