add serial bind test; related to #20

Author: tanner0101

Sources/NIOPostgres/Connection/PostgresConnection.swift

@@ -19,6 +19,9 @@ public final class PostgresConnection {
     }
 
     public func close() -> EventLoopFuture<Void> {
+        guard self.channel.isActive else {
+            return self.eventLoop.makeSucceededFuture(())
+        }
         return self.channel.close(mode: .all)
     }
 

Tests/NIOPostgresTests/NIOPostgresTests.swift

@@ -233,6 +233,17 @@ final class NIOPostgresTests: XCTestCase {
         }
     }
 
+    /// https://github.com/vapor/nio-postgres/issues/20
+    func testBindInteger() throws {
+        let conn = try PostgresConnection.test(on: eventLoop).wait()
+        defer { try! conn.close().wait() }
+        _ = try conn.simpleQuery("drop table if exists person;").wait()
+        _ = try conn.simpleQuery("create table person(id serial primary key, first_name text, last_name text);").wait()
+        defer { _ = try! conn.simpleQuery("drop table person;").wait() }
+        let id = PostgresData(int32: 5)
+        _ = try conn.query("SELECT id, first_name, last_name FROM person WHERE id = $1", [id]).wait()
+    }
+    
     func testRemoteTLSServer() throws {
         let url = "postgres://uymgphwj:[email protected]:5432/uymgphwj"
         let elg = MultiThreadedEventLoopGroup(numberOfThreads: 1)

Tests/NIOPostgresTests/XCTestManifests.swift

@@ -6,6 +6,7 @@ extension NIOPostgresTests {
     //   `swift test --generate-linuxmain`
     // to regenerate.
     static let __allTests__NIOPostgresTests = [
+        ("testBindInteger", testBindInteger),
         ("testConnectAndClose", testConnectAndClose),
         ("testDates", testDates),
         ("testIntegers", testIntegers),