ConsoleServiceTest: wait for EDTPrinters to finish

Calling .get() on the Future returned by ThreadService.run ensures that
the events will be seen in subsequent checks.

Added comments clarifying where the runs are expected to have completed.

Closes #149

Author: hinerm

src/test/java/org/scijava/console/ConsoleServiceTest.java

@@ -167,11 +167,15 @@ public void testMultipleContextOutput() throws InterruptedException,
 		ts1.run(new Printer(c1RunOut, c1RunErr)).get();
 		ts2.run(new Printer(c2RunOut, c2RunErr)).get();
 
-		ts1.run(new EDTPrinter(ts1, c1InvokeOut, c1InvokeErr));
-		ts2.run(new EDTPrinter(ts2, c2InvokeOut, c2InvokeErr));
+		ts1.run(new EDTPrinter(ts1, c1InvokeOut, c1InvokeErr)).get();
+		ts2.run(new EDTPrinter(ts2, c2InvokeOut, c2InvokeErr)).get();
 
 		c2.dispose();
 
+		// NB: all printing is assumed to have completed. If there are test failures
+		// at this point it is likely due to a thread not having completed before
+		// the assert checks.
+
 		assertEquals(6, events1.size());
 		assertOutputEvent(Source.STDOUT, globalOut, false, events1.get(0));
 		assertOutputEvent(Source.STDERR, globalErr, false, events1.get(1));