stop test from hanging during blocking method call.

Ghidra/Framework/Pty/src/test/java/ghidra/pty/windows/ConPtyTest.java

@@ -16,6 +16,7 @@
 package ghidra.pty.windows;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.fail;
 import static org.junit.Assume.assumeTrue;
 
@@ -69,16 +70,28 @@ public class ConPtyTest extends AbstractPtyTest {
 
 			writer.println("echo test");
 			writer.flush();
-			String line;
-			do {
-				line = reader.readLine();
-			}
-			while (!"test".equals(line));
-
+			// set up reading cmd output on a thread since "readLine" is blocking
+			Thread t = new Thread(() -> {
+				String line;
+				try {
+					do {
+						line = reader.readLine();
+					}
+					while (!"test".equals(line));	
+				} catch (IOException e) {
+					// TODO Auto-generated catch block
+					e.printStackTrace();
+				}
+			});
+			
+			t.setDaemon(true);
+			t.start();
+			
 			writer.println("exit 3");
 			writer.flush();
 
 			assertEquals(3, cmd.waitExited());
+			assertFalse("Content read successfully from the cmd", t.isAlive());
 		}
 	}