Fix usage() to print missing new-line characters.

The change affects the result of usage() when:
- there are commands and no main parameters
- there are commands without parameters

1 files changed, 50 insertions, 0 deletions

diff --git a/src/test/java/com/beust/jcommander/JCommanderTest.java b/src/test/java/com/beust/jcommander/JCommanderTest.java
index 22c5082..b705bfa 100644
--- a/src/test/java/com/beust/jcommander/JCommanderTest.java
+++ b/src/test/java/com/beust/jcommander/JCommanderTest.java
@@ -895,6 +895,56 @@ public class JCommanderTest {
     Assert.assertEquals(V2.names, Arrays.asList(new String[] { "-h", "--host" }));
     Assert.assertTrue(V2.validateCalled);
   }
+  
+  public void usageCommandsUnderUsage() {
+    class Arg {
+    }
+    @Parameters(commandDescription = "command a")
+    class ArgCommandA {
+      @Parameter(description = "command a parameters")
+      List<String> parameters;
+    }
+    @Parameters(commandDescription = "command b")
+    class ArgCommandB {
+      @Parameter(description = "command b parameters")
+      List<String> parameters;
+    }
+    
+    Arg a = new Arg();
+    
+    JCommander c = new JCommander(a);
+    c.addCommand("a", new ArgCommandA());
+    c.addCommand("b", new ArgCommandB());
+    
+    StringBuilder sb = new StringBuilder();
+    c.usage(sb);
+    Assert.assertTrue(sb.toString().contains("[command options]\n  Commands:"));
+  }
+
+  public void usageWithEmpytLine() {
+    class Arg {
+    }
+    @Parameters(commandDescription = "command a")
+    class ArgCommandA {
+      @Parameter(description = "command a parameters")
+      List<String> parameters;
+    }
+    @Parameters(commandDescription = "command b")
+    class ArgCommandB {
+      @Parameter(description = "command b parameters")
+      List<String> parameters;
+    }
+    
+    Arg a = new Arg();
+    
+    JCommander c = new JCommander(a);
+    c.addCommand("a", new ArgCommandA());
+    c.addCommand("b", new ArgCommandB());
+    
+    StringBuilder sb = new StringBuilder();
+    c.usage(sb);
+    Assert.assertTrue(sb.toString().contains("command a parameters\n\n    b"));
+  }
 
   @Test(enabled = false)
   public static void main(String[] args) throws Exception {