Added test Issue1528#testSubCommandAliasModification

src/test/java/picocli/Issue1528.java

@@ -0,0 +1,74 @@
+package picocli;
+
+import java.util.concurrent.Callable;
+import org.junit.Test;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.Model.CommandSpec;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotEquals;
+
+public class Issue1528 {
+
+    @Command(name = "main", subcommands = SubCommand.class)
+    static class MainCommand implements Callable<Integer> {
+        @Override
+        public Integer call() throws Exception {
+            return null;
+        }
+    }
+
+    @Command(name = "sub")
+    static class SubCommand implements Callable<Integer> {
+        @Override
+        public Integer call() throws Exception {
+            return null;
+        }
+    }
+
+    @Test
+    public void testSubCommandAliasModification() {
+        CommandLine cl = new CommandLine(new MainCommand());
+        CommandSpec cs = cl.getSubcommands().get("sub").getCommandSpec();
+
+        assertEquals(0, cs.aliases().length);
+        assertEquals(0, cl.execute("sub"));
+        assertNotEquals(0, cl.execute("alias1"));
+
+        cs.aliases("alias1");
+        assertEquals(1, cs.aliases().length);
+        assertEquals("alias1", cs.aliases()[0]);
+        assertEquals(0, cl.execute("sub"));
+        assertEquals(0, cl.execute("alias1"));
+
+        cs.aliases("alias1", "alias2");
+        assertEquals(2, cs.aliases().length);
+        assertEquals("alias1", cs.aliases()[0]);
+        assertEquals("alias2", cs.aliases()[1]);
+        assertEquals(0, cl.execute("sub"));
+        assertEquals(0, cl.execute("alias1"));
+        assertEquals(0, cl.execute("alias2"));
+
+        cs.aliases("alias2");
+        assertEquals(1, cs.aliases().length);
+        assertEquals("alias2", cs.aliases()[0]);
+        assertEquals(0, cl.execute("sub"));
+        assertNotEquals(0, cl.execute("alias1"));
+        assertEquals(0, cl.execute("alias2"));
+
+        cs.aliases("alias3");
+        assertEquals(1, cs.aliases().length);
+        assertEquals("alias3", cs.aliases()[0]);
+        assertEquals(0, cl.execute("sub"));
+        assertNotEquals(0, cl.execute("alias1"));
+        assertNotEquals(0, cl.execute("alias2"));
+        assertEquals(0, cl.execute("alias3"));
+
+        cs.aliases(new String[0]);
+        assertEquals(0, cs.aliases().length);
+        assertEquals(0, cl.execute("sub"));
+        assertNotEquals(0, cl.execute("alias1"));
+        assertNotEquals(0, cl.execute("alias2"));
+        assertNotEquals(0, cl.execute("alias3"));
+    }
+}