Improve error handling in connection pool tests

Add error checks to Close() calls in connpool_test.go to ensure connection closures are handled properly, with descriptive error messages. Update comment in connpool.go to improve clarity on the source of code inspiration.

connpool.go

@@ -12,9 +12,8 @@ import (
 	"sync"
 )
 
-// Parts of the connection pool code is forked from https://github.com/fatih/pool/
+// Parts of the connection pool code is forked/took inspiration from https://github.com/fatih/pool/
-// Thanks to Fatih Arslan and the project contributors for providing this great
+// Thanks to Fatih Arslan and the project contributors for providing this great concurrency template.
-// concurrency template.
 
 var (
 	// ErrClosed is returned when an operation is attempted on a closed connection pool.

connpool_test.go

@@ -175,7 +175,9 @@ func TestPoolConn_Close(t *testing.T) {
 		conns[i] = conn
 	}
 	for _, conn := range conns {
-		conn.Close()
+		if err = conn.Close(); err != nil {
+			t.Errorf("failed to close connection: %s", err)
+		}
 	}
 
 	if p.Size() != 30 {
@@ -191,7 +193,9 @@ func TestPoolConn_Close(t *testing.T) {
 	}
 	p.Close()
 
-	conn.Close()
+	if err = conn.Close(); err != nil {
+		t.Errorf("failed to close connection: %s", err)
+	}
 	if p.Size() != 0 {
 		t.Errorf("closed pool shouldn't allow to put connections.")
 	}