A collection of small exercises in the form of unit tests, designed to get Java developers up to speed on Groovy
Home Page: http://nadavc.github.com/groovykoans
License: Do What The F*ck You Want To Public License
I can't get a Success on test 02 from the default solution.
I have java 1.6.0.32, windows 7 (64 bits).
Stacktrace is:
junit.framework.ComparisonFailure: expected:<...m laoreet fermentum.[
Ut ornare turpis vitae est auctor sit amet tincidunt nisi feugiat. Donec nec ligula ut nibh convallis mollis
sollicitudin et lacus. Phasellus odio erat, consectetur vitae dictum ac, varius consectetur dolor.
Aenean pretium volutpat nisi vel laoreet. Nulla facilisi. Phasellus sed nisi nibh. Curabitur auctor erat vel arcu
bibendum id auctor lacus fermentum. Suspendisse cursus volutpat feugiat. Suspendisse sed urna lectus,
molestie fermentum augue.
Donec mauris diam, mattis quis posuere at, pharetra ac libero. Mauris a lacus id lorem tempus dapibus. Ut viverra
imperdiet sapien, vel rhoncus mauris cursus eu. Donec bibendum feugiat ultrices. Vivamus facilisis nisi et lectus
Etiam id leo vitae nibh bibendum semper vel sed velit. Etiam tristique urna auctor arcu feugiat nec vehicula neque
vulputate. Pellentesque nunc leo, tincidunt sed dapibus sed, pulvinar nec nunc. Mauris vel urna vitae ipsum mattis
congue accumsan a tellus. Donec adipiscing arcu quis enim iaculis ut commodo nisl lacinia. Mauris turpis justo,
congue quis sed urna. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.
Morbi sagittis tincidunt quam, ac tristique elit rhoncus id. In sem sem, tempus venenatis faucibus eu, dictum ac
congue eu laoreet ac, porttitor non magna. Mauris imperdiet aliquam nisi sed scelerisque. Maecenas eget]
convallis sapien. M...> but was:<...m laoreet fermentum.[
Ut ornare turpis vitae est auctor sit amet tincidunt nisi feugiat. Donec nec ligula ut nibh convallis mollis
sollicitudin et lacus. Phasellus odio erat, consectetur vitae dictum ac, varius consectetur dolor.
Aenean pretium volutpat nisi vel laoreet. Nulla facilisi. Phasellus sed nisi nibh. Curabitur auctor erat vel arcu
bibendum id auctor lacus fermentum. Suspendisse cursus volutpat feugiat. Suspendisse sed urna lectus,
molestie fermentum augue.
Donec mauris diam, mattis quis posuere at, pharetra ac libero. Mauris a lacus id lorem tempus dapibus. Ut viverra
imperdiet sapien, vel rhoncus mauris cursus eu. Donec bibendum feugiat ultrices. Vivamus facilisis nisi et lectus
Etiam id leo vitae nibh bibendum semper vel sed velit. Etiam tristique urna auctor arcu feugiat nec vehicula neque
vulputate. Pellentesque nunc leo, tincidunt sed dapibus sed, pulvinar nec nunc. Mauris vel urna vitae ipsum mattis
congue accumsan a tellus. Donec adipiscing arcu quis enim iaculis ut commodo nisl lacinia. Mauris turpis justo,
congue quis sed urna. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.
Morbi sagittis tincidunt quam, ac tristique elit rhoncus id. In sem sem, tempus venenatis faucibus eu, dictum ac
congue eu laoreet ac, porttitor non magna. Mauris imperdiet aliquam nisi sed scelerisque. Maecenas eget
]
convallis sapien. M...>
at junit.framework.Assert.assertEquals(Assert.java:85)
at groovy.util.GroovyTestCase.assertEquals(GroovyTestCase.java:367)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:90)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:233)
at groovy.lang.MetaClassImpl.invokeStaticMethod(MetaClassImpl.java:1330)
at org.codehaus.groovy.runtime.callsite.StaticMetaClassSite.callStatic(StaticMetaClassSite.java:62)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCallStatic(CallSiteArray.java:53)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:157)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callStatic(AbstractCallSite.java:169)
at org.groovykoans.koan04.Koan04.test02_MoreClosureIntro(Koan04.groovy:145)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at junit.framework.TestCase.runTest(TestCase.java:168)
at junit.framework.TestCase.runBare(TestCase.java:134)
at junit.framework.TestResult$1.protect(TestResult.java:110)
at junit.framework.TestResult.runProtected(TestResult.java:128)
at junit.framework.TestResult.run(TestResult.java:113)
at junit.framework.TestCase.run(TestCase.java:124)
at junit.framework.TestSuite.runTest(TestSuite.java:243)
at junit.framework.TestSuite.run(TestSuite.java:238)
at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:55)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:42)
at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:75)
at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:49)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
at $Proxy2.processTestClass(Unknown Source)
at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:103)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
at org.gradle.messaging.remote.internal.TypeCastDispatch.dispatch(TypeCastDispatch.java:30)
at org.gradle.messaging.remote.internal.WorkerProtocol.handleIncoming(WorkerProtocol.java:53)
at org.gradle.messaging.remote.internal.WorkerProtocol.handleIncoming(WorkerProtocol.java:31)
at org.gradle.messaging.remote.internal.ProtocolStack$ProtocolStage.handleIncoming(ProtocolStack.java:167)
at org.gradle.messaging.remote.internal.ProtocolStack$BottomStage.handleIncoming(ProtocolStack.java:277)
at org.gradle.messaging.remote.internal.ProtocolStack$BottomConnection$1.run(ProtocolStack.java:299)
at org.gradle.messaging.remote.internal.ProtocolStack$ExecuteRunnable.dispatch(ProtocolStack.java:120)
at org.gradle.messaging.remote.internal.ProtocolStack$ExecuteRunnable.dispatch(ProtocolStack.java:116)
at org.gradle.messaging.dispatch.AsyncDispatch.dispatchMessages(AsyncDispatch.java:132)
at org.gradle.messaging.dispatch.AsyncDispatch.access$000(AsyncDispatch.java:33)
at org.gradle.messaging.dispatch.AsyncDispatch$1.run(AsyncDispatch.java:72)
at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:66)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
No ------ EDIT HERE ----- comments, unsure really what to do here. Also, getting undefined class Person/Cartoon -- is this test about package/other file inclusion, or the subject is switch.isCase()?
Hi
Link http://naleid.com/blog/2009/04/07/groovy-161-released-with-new-find-and-findall-regexp-methods-on-string/ doesn't work.
Test description needs to be changed
FAILURE: Build failed with an exception.
1 error
BUILD FAILED
On the asserts... why not just use groovy power asserts? They're more readable (IMO), and produce the nice power assert messages when they fail. You can always tack on your desired message as a 2nd param:
assertEquals('Modify "Hola" to "Hello" to proceed', "Hello", hello)
can just be
assert hello == "Hello", 'Modify "Hola" to "Hello" to proceed'
Why learn nasty old JUnit syntax if not necessary? :)
(reported by @winkler1)
Not really an issue but, is there a way to prevent the file window to open (I'm on linux) every time I run a test?
http://groovykoans.org/ is no longer accessible as of 5/7/2015
Hi,
I'm having problems running this with Intellij. It seems the libraries may need to be updated or I need better instructions on how to get this project running.
I would appreciate the documents being updated. Please and thanks!
I don't consider myself a Groovy expert but not a novice either and I found quite a tricky behauvior that may need some extra clarification in test05.
I wrote the following solution, which may seem correct:
message = 'Hello ' + userService.getLoggedInUser()?.getFirstName()?:'Anonymous' + '!'
However, unless parenthesis are added as follows it does not work
message = 'Hello ' + (userService.getLoggedInUser()?.getFirstName()?:'Anonymous') + '!'
Seeing why in one case it returns "Hello null" is easy, but understanding why on the other the result is "Hello Ronaldo" is not.
Seeing the missleading behauviour of elvis operator, ¿wouln'd it be nice to add a test for it, or some extra information?
Thanks
Solution is wrong, it misses 10 as nextInt(n) is not inclusive.
Should be maxInt+1
// ------------ START EDITING HERE ----------------------
def random = new Random()
[random.nextInt(maxInt+1), random.nextInt(maxInt+1)]
// ------------ STOP EDITING HERE ----------------------
I was having issues with Koan04.
As I am new to Groovy closures, my first thought for filtering was break file into lines and loop through with a for loop and only append the StringWriter with lines that don't start with "#".
List<String> unfilteredLines = new File("$prefix/exercise.txt").readLines()
for (String unfilteredLine : unfilteredLines){
if(!unfilteredLine.startsWith("#")){
filteredResult.append(unfilteredLine)
}
}This worked correctly but the test was failed when compared against ‘answer’, I added println to see what 'answer' was and what 'result' was.
String result = filteredResult.toString().trim().replaceAll(/[\n\r]+/, /\n/)
String answer = new File("$prefix/exercise-solved.txt").text.replaceAll(/[\n\r]+/, /\n/)
println result
println answer
assert answer == resultResult output:
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque fringilla lacus ut diam laoreet fermentum.Ut ornare turpis vitae est auctor sit amet tincidunt nisi feugiat. Donec nec ligula ut nibh convallis mollissollicitudin et lacus. Phasellus odio erat, consectetur vitae dictum ac, varius consectetur dolor.Aenean pretium volutpat nisi vel laoreet. Nulla facilisi. Phasellus sed nisi nibh. Curabitur auctor erat vel arcubibendum id auctor lacus fermentum. Suspendisse cursus volutpat feugiat. Suspendisse sed urna lectus,molestie fermentum augue.Donec mauris diam, mattis quis posuere at, pharetra ac libero. Mauris a lacus id lorem tempus dapibus. Ut viverraimperdiet sapien, vel rhoncus mauris cursus eu. Donec bibendum feugiat ultrices. Vivamus facilisis nisi et lectusEtiam id leo vitae nibh bibendum semper vel sed velit. Etiam tristique urna auctor arcu feugiat nec vehicula nequevulputate. Pellentesque nunc leo, tincidunt sed dapibus sed, pulvinar nec nunc. Mauris vel urna vitae ipsum mattiscongue accumsan a tellus. Donec adipiscing arcu quis enim iaculis ut commodo nisl lacinia. Mauris turpis justo,congue quis sed urna. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.Morbi sagittis tincidunt quam, ac tristique elit rhoncus id. In sem sem, tempus venenatis faucibus eu, dictum accongue eu laoreet ac, porttitor non magna. Mauris imperdiet aliquam nisi sed scelerisque. Maecenas egetconvallis sapien. Mauris convallis sapien ut tellus condimentum volutpat. Nunc nec velit nisl, aliquet gravida felis.
Answer output:
Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque fringilla lacus ut diam laoreet fermentum.nUt ornare turpis vitae est auctor sit amet tincidunt nisi feugiat. Donec nec ligula ut nibh convallis mollisnsollicitudin et lacus. Phasellus odio erat, consectetur vitae dictum ac, varius consectetur dolor.nAenean pretium volutpat nisi vel laoreet. Nulla facilisi. Phasellus sed nisi nibh. Curabitur auctor erat vel arcunbibendum id auctor lacus fermentum. Suspendisse cursus volutpat feugiat. Suspendisse sed urna lectus,nmolestie fermentum augue.nDonec mauris diam, mattis quis posuere at, pharetra ac libero. Mauris a lacus id lorem tempus dapibus. Ut viverranimperdiet sapien, vel rhoncus mauris cursus eu. Donec bibendum feugiat ultrices. Vivamus facilisis nisi et lectusnEtiam id leo vitae nibh bibendum semper vel sed velit. Etiam tristique urna auctor arcu feugiat nec vehicula nequenvulputate. Pellentesque nunc leo, tincidunt sed dapibus sed, pulvinar nec nunc. Mauris vel urna vitae ipsum mattisncongue accumsan a tellus. Donec adipiscing arcu quis enim iaculis ut commodo nisl lacinia. Mauris turpis justo,ncongue quis sed urna. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus.nMorbi sagittis tincidunt quam, ac tristique elit rhoncus id. In sem sem, tempus venenatis faucibus eu, dictum acncongue eu laoreet ac, porttitor non magna. Mauris imperdiet aliquam nisi sed scelerisque. Maecenas egetnconvallis sapien. Mauris convallis sapien ut tellus condimentum volutpat. Nunc nec velit nisl, aliquet gravida felis.```
If you notice, there is a "n" added at what is the first line break.
fringilla lacus ut diam laoreet fermentum.Ut ornare
fringilla lacus ut diam laoreet fermentum.nUt ornare
Notice the "n" inserted between the "." and "Ut ornare", this should not be here.
After switching to Groovy closure.
File file = new File("$prefix/exercise.txt")
file.filterLine(filteredResult) { String line ->
!line.startsWith('#')
}The "n" is now present in both "result" and "answer". Unfortunately, though this now passes it is not correct, the "n" should not be there.
fringilla lacus ut diam laoreet fermentum.nUt ornare
fringilla lacus ut diam laoreet fermentum.nUt ornare
I am working on Groovy Koans via IntelliJ on a MacBook Pro. I have suspected that this may have something to do with line endings, but is an issue in either way.
When running the tests with the Gradle wrapper, e.g. ./gradlew koan01, it fails under Java 8 with an exception. The underlying exception is:
Caused by: java.lang.IllegalArgumentException
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
Turns out this is a bug in older versions of Gradle (see http://issues.gradle.org/browse/GRADLE-2667). This was fixed in Gradle 1.10, so the fix is trivial - just update the Gradle wrapper to 1.10 or later.
I'm new to Groovy -- so it was nice to find your koans. But...
The instructions should mention the necessity for installing Gradle. As it wasn't mentioned, I attempted to do things without running "./gradlew KoanN" without any success.
Is "gradlew" always to be installed (per the example) in the parent directory of the main Koans directory?
Thank you.
From the terminal, how can I run the test case from the test directory?
Example using Koan01.
I navigated to this location.
https://github.com/nadavc/groovykoans/tree/master/src/test/groovy/org/groovykoans/koan01
Ran this command.
javac *.java && groovy -cp . Koan01.groovy
Error:
unable to resolve class User
Command History:
Operators-MacBook-Pro:koan01 lbattle$ javac *.java && groovy -cp . Koan01.groovy
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
/groovykoans/src/test/groovy/org/groovykoans/koan01/Koan01.groovy: 102: unable to resolve class User
@ line 102, column 14.
User player = new User('Ronaldo', 'Nazário de Lima', 'ron', null)
^
/groovykoans/src/test/groovy/org/groovykoans/koan01/Koan01.groovy: 102: unable to resolve class User
@ line 102, column 23.
User player = new User('Ronaldo', 'Nazário de Lima', 'ron', null)
^
/groovykoans/src/test/groovy/org/groovykoans/koan01/Koan01.groovy: 103: unable to resolve class UserService
@ line 103, column 21.
UserService userServiceWithUserLoggedIn = [getLoggedInUser: { player }] as UserService
^
/groovykoans/src/test/groovy/org/groovykoans/koan01/Koan01.groovy: 103: unable to resolve class UserService
@ line 103, column 81.
[getLoggedInUser: { player }] as UserSer
^
/groovykoans/src/test/groovy/org/groovykoans/koan01/Koan01.groovy: 104: unable to resolve class UserService
@ line 104, column 21.
UserService userServiceWithoutLoggedInUser = [getLoggedInUser: { null }] as UserService
^
/groovykoans/src/test/groovy/org/groovykoans/koan01/Koan01.groovy: 104: unable to resolve class UserService
@ line 104, column 82.
= [getLoggedInUser: { null }] as UserSer
^
/groovykoans/src/test/groovy/org/groovykoans/koan01/Koan01.groovy: 131: unable to resolve class UserService
@ line 131, column 41.
e String createMessageForUser(UserServic
^
7 errors
Hey-
Not sure how to best contact you so trying this. First - awesome idea!
Issue - I downloaded the zip and did the first koan.
E:\downloads\nadavc-groovykoans-19dc5c1\nadavc-groovykoans-19dc5c1>gradlew koan01
Groovy Koans 0.1:
"When 900 years old, you reach, look as good, you will not." - Yoda
-------------------------------------------------------------------
Running exercises in test01_AssertionsAndSomeSyntax().......SUCCESS
Running exercises in test05_ElvisAndSafeNavigation()........SUCCESS
Running exercises in test04_Lists().........................SUCCESS
Running exercises in test02_GStrings()......................SUCCESS
Running exercises in test03_MapsInGroovy()..................SUCCESS
Koan is complete. Well done!
The code already has the answers in it!
On the asserts... why not just use groovy power asserts? They're more readable (IMO), and produce the nice power assert messages when they fail. You can always tack on your desired message as a 2nd param:
assertEquals('Modify "Hola" to "Hello" to proceed', "Hello", hello)
can just be
assert hello == "Hello", 'Modify "Hola" to "Hello" to proceed'
Why learn nasty old JUnit syntax if not necessary? :)
Solution: add the -Dhttp.proxyHost=[http proxy] -Dhttp.proxyPort=[http proxy port] parameters when you first run Gradle (add a troubleshooting section)
Upgraded to Gradle 2.0, running the koans results in an error:
FAILURE: Build failed with an exception.
Where:
Build file '/Users/joe/devel/projects/groovykoans/build.gradle' line: 32
What went wrong:
A problem occurred evaluating root project 'groovykoans'.
Could not find method groovy() for arguments [[org.codehaus.groovy:groovy:2.0.5, org.codehaus.groovy:groovy-ant:2.0.5, org.codehaus.groovy:groovy-sql:2.0.5, org.codehaus.groovy:groovy-test:2.0.5]] on root project 'groovykoans'.
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