Add SFTP integration test

Signed-off-by: Jeroen van Erp <jeroen@hierynomus.com>

src/itest/java/com/hierynomus/sshj/sftp/SftpIntegrationTest.java

@@ -0,0 +1,47 @@
+/*
+ * Copyright (C)2009 - SSHJ Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.hierynomus.sshj.sftp;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+
+import org.junit.jupiter.api.Test;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
+
+import com.hierynomus.sshj.SshdContainer;
+
+import net.schmizz.sshj.SSHClient;
+import net.schmizz.sshj.sftp.FileAttributes;
+import net.schmizz.sshj.sftp.SFTPClient;
+
+@Testcontainers
+public class SftpIntegrationTest {
+    @Container
+    private static SshdContainer sshd = new SshdContainer();
+
+    @Test
+    public void shouldCheckFileExistsForNonExistingFile_GH894() throws Throwable {
+        try (SSHClient client = sshd.getConnectedClient()) {
+            client.authPublickey("sshj", "src/test/resources/id_rsa");
+            try (SFTPClient sftp = client.newSFTPClient()) {
+                String file = "/home/sshj/i_do_not_exist.txt";
+                FileAttributes exists = sftp.statExistence(file);
+                assertNull(exists);
+            }
+        }
+    }
+}