Capturing CTRL+D EOF to exit the shell

* Capturing CTRL+D (EOF) to exit the shell
* replace junit to assertj
* fix hang on testing

spring-shell-core/src/main/java/org/springframework/shell/jline/InteractiveShellRunner.java

@@ -16,6 +16,7 @@
 
 package org.springframework.shell.jline;
 
+import org.jline.reader.EndOfFileException;
 import org.jline.reader.LineReader;
 import org.jline.reader.UserInterruptException;
 import org.jline.utils.AttributedString;
@@ -101,6 +102,9 @@ public class InteractiveShellRunner implements ShellRunner {
 					return Input.EMPTY;
 				}
 			}
+			catch (EndOfFileException e) {
+				throw new ExitRequest(1);
+			}
 			return new ParsedLineInput(lineReader.getParsedLine());
 		}
 	}