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PID: (page 1)

import java.io.IOException;

import java.net.URI;

class Handler implements URLHandler {

int num = 0;

public String handleRequest(URI url) { /* handles requests for /, /increment, /add?count=X */ }

}

class NumberServer {

public static void main(String[] args) throws IOException { /* starts up the server on a port given in args[0] }

}

import static org.junit.Assert.*;

import org.junit.*;

import java.net.URI;

import java.net.URISyntaxException;

public class TestNumberServer {

@Test

public void testIncrement() throws URISyntaxException {

Handler h = new Handler();

URI increment = new URI("http://localhost/increment");

URI rootPath = new URI("http://localhost/");

assertEquals("Number incremented!", h.handleRequest(increment));

assertEquals("Number: 1", h.handleRequest(rootPath));

assertEquals(____________________________________________, h.handleRequest(increment));

assertEquals(________________________________________, h.handleRequest(rootPath));

}

set -e

javac -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar Server.java NumberServer.java TestNumberServer.java

java -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar org.junit.runner.JUnitCore TestNumberServer

set -e

javac Server.java NumberServer.java

java NumberServer 4001

start.sh

test.sh

TestNumberServer.java

NumberServer.java

(Server.java not shown)

$ bash test.sh

JUnit version 4.13.2

Time: 0.007

OK (1 test)

$ bash start.sh

Server Started! Visit http://localhost:4001.

What do you notice and wonder about this program and these commands? What problems do they solve?

At its simplest, a bash script (or shell script) is a sequence of commands we could run at the terminal saved in a file, usually with .sh extension.

We can run them all by using bash from the terminal on that file. It can save us a lot of typing and remembering commands. We can save bash scripts in repositories to make it easy to build after cloning.

Discussion questions:

- Where else would bash be useful besides this class? (very high level)

- What does this -cp option do and what does all of this stuff mean (the paths after `-cp`)?

- What do you think `set -e` does?

- Where else could these commands be used?

- Ask them to come up with another way to do one of the commands on the back

- How have you used this/how is this helpful in CSE 12? (Or any other class)

- What do you think is the difference between these two commands?

- Where would these be useful

- Associating words with commands, e.g. `ls` with `list`. What's a good word for the different commands like `wc`, `grep`.

- What are the differences between `bash` files and `java` files? What happens if you run `javac` on a file with bash commands in it? What about running `bash` on a `.java` file with Java code in it? What if you change the extensions?

- When `bash` would have already been useful.

- What do they think goes in the testing blanks? Just prompting them for answers, and to infer from previous examples.

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Name:

PID: (page 2)

$ bash start.sh 8765

Server Started! Visit http://localhost:8765 to visit.

What if we want to provide the port? How should we change start.sh below to accomplish that?

set -e

javac Server.java NumberServer.java

java NumberServer 4001

start.sh

set -e

javac -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar Server.java NumberServer.java TestNumberServer.java

java -cp .:lib/hamcrest-core-1.3.jar:lib/junit-4.13.2.jar org.junit.runner.JUnitCore TestNumberServer

test.sh

This has a long list of .java files – what if we add another one? Any way to type less?

What does set -e do and why should we care?

$ # remove set -e, edit NumberServer.java to have a missing ";"

$ bash test.sh

NumberServer.java:11: error: ';' expected

return String.format("Number: %d", num)

1 error

JUnit version 4.13.2

...

Time: 0.007

OK (1 test)