updated docs with exitCode (#1319)

Author: dmarkhas

docs/examples/src/test/java/generic/ExecTest.java

@@ -24,7 +24,9 @@ public void testSimpleExec() throws IOException, InterruptedException {
         // execReadingStdout {
         Container.ExecResult lsResult = container.execInContainer("ls", "-al", "/");
         String stdout = lsResult.getStdout();
+        int exitCode = lsResult.getExitCode();
         assertTrue(stdout.contains("somefile.txt"));
+        assertTrue(exitCode == 0);
         // }
     }
 }

docs/features/commands.md

@@ -16,14 +16,12 @@ Your test can execute a command inside a running container, similar to a `docker
 [Executing a command inside a running container](../examples/src/test/java/generic/ExecTest.java) inside_block:standaloneExec
 <!--/codeinclude-->
 
-This can be useful for software that has a command line administration tool. You can also get the output (stdout/stderr) from the command - for example:
+This can be useful for software that has a command line administration tool. You can also get the output (stdout/stderr) and exit code from the command - for example:
 
 <!--codeinclude-->
 [Executing a command inside a running container and reading the result](../examples/src/test/java/generic/ExecTest.java) inside_block:execReadingStdout
 <!--/codeinclude-->
 
-Note that there is no way to get the return code of the executed command, only stdout/stderr.
-
 ## Environment variables
 
 To add environment variables to the container, use `withEnv`: