Add tests for getPort().

This method was only tested indirectly.

Author: stefanbirkner

src/test/java/com/github/stefanbirkner/fakesftpserver/rule/FakeSftpServerRuleTest.java

@@ -14,6 +14,7 @@
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.Vector;
+import java.util.concurrent.atomic.AtomicInteger;
 
 import static com.github.stefanbirkner.fakesftpserver.rule.Executor.executeTestThatThrowsExceptionWithRule;
 import static com.github.stefanbirkner.fakesftpserver.rule.Executor.executeTestWithRule;
@@ -657,6 +658,40 @@ public void it_is_not_possible_to_set_a_port_greater_than_65535() {
         }
     }
 
+    public static class port_query {
+        @Test
+        public void port_can_be_read_before_the_test() {
+            FakeSftpServerRule sftpServer = new FakeSftpServerRule()
+                .setPort(DUMMY_PORT);
+            int port = sftpServer.getPort();
+            assertThat(port).isEqualTo(DUMMY_PORT);
+        }
+
+        @Test
+        public void port_can_be_read_during_the_test() {
+            AtomicInteger portCapture = new AtomicInteger();
+            FakeSftpServerRule sftpServer = new FakeSftpServerRule()
+                .setPort(DUMMY_PORT);
+            executeTestWithRule(
+                () -> portCapture.set(sftpServer.getPort()),
+                sftpServer
+            );
+            assertThat(portCapture).hasValue(DUMMY_PORT);
+        }
+
+        @Test
+        public void port_can_be_read_after_the_test() {
+            FakeSftpServerRule sftpServer = new FakeSftpServerRule()
+                .setPort(DUMMY_PORT);
+            executeTestWithRule(
+                () -> {},
+                sftpServer
+            );
+            int port = sftpServer.getPort();
+            assertThat(port).isEqualTo(DUMMY_PORT);
+        }
+    }
+
     private static Session connectToServer(
         FakeSftpServerRule sftpServer
     ) throws JSchException {