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XMLUnit for Java 2.x

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XMLUnit for Java 2.x
====================

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XMLUnit is a library that supports testing XML output in several ways.

XMLUnit 2.x is a complete rewrite of XMLUnit and actually doesn't
share any code with XMLUnit for Java 1.x.

Some goals for XMLUnit 2.x:

* create .NET and Java versions that are compatible in design while
  trying to be idiomatic for each platform
* remove all static configuration (the old XMLUnit class setter methods)
* focus on the parts that are useful for testing
  - XPath
  - (Schema) validation
  - comparisons
* be independent of any test framework

XMLUnit 1.x is no longer maintained, you can still find the old forum over at
[sourceforge](https://sourceforge.net/projects/xmlunit/) and we still use the
sourceforge provided mailing list.

## Documentation

* [Developer Guide](https://github.com/xmlunit/xmlunit/wiki)
* [User's Guide](https://github.com/xmlunit/user-guide/wiki)

## Help Wanted!

If you are looking for something to work on, we've compiled a
[list](HELP_WANTED.md) of known issues.

Please see the [contributing guide](CONTRIBUTING.md) for details on
how to contribute.

## Latest Release

The latest releases are available as
[GitHub releases](https://github.com/xmlunit/xmlunit/releases) or via
[Maven Central](https://central.sonatype.com/search?q=org.xmlunit).

The core library is

```xml
<dependency>
  <groupId>org.xmlunit</groupId>
  <artifactId>xmlunit-core</artifactId>
  <version>x.y.z</version>
</dependency>
```

## SNAPSHOT builds

We are providing SNAPSHOT builds from
[Sonatype's Central Portal Snapshots](https://central.sonatype.com/service/rest/repository/browse/maven-snapshots/org/xmlunit/),
you need to add

```xml
<repository>
  <name>Central Portal Snapshots</name>
  <id>central-portal-snapshots</id>
  <url>https://central.sonatype.com/repository/maven-snapshots/</url>
  <releases><enabled>false</enabled></releases>
  <snapshots><enabled>true</enabled></snapshots>
</repository>
```

to your Maven settings.

## Examples

These are some really small examples, more is available as part of the
[user guide](https://github.com/xmlunit/user-guide/wiki)

### Comparing Two Documents

```java
Source control = Input.fromFile("test-data/good.xml").build();
Source test = Input.fromByteArray(createTestDocument()).build();
DifferenceEngine diff = new DOMDifferenceEngine();
diff.addDifferenceListener(new ComparisonListener() {
        public void comparisonPerformed(Comparison comparison, ComparisonResult outcome) {
            Assert.fail("found a difference: " + comparison);
        }
    });
diff.compare(control, test);
```

or using the fluent builder API

```java
Diff d = DiffBuilder.compare(Input.fromFile("test-data/good.xml"))
             .withTest(createTestDocument()).build();
assert !d.hasDifferences();
```

or using Hamcrest with `CompareMatcher`

```java
import static org.xmlunit.matchers.CompareMatcher.isIdenticalTo;
...

assertThat(createTestDocument(), isIdenticalTo(Input.fromFile("test-data/good.xml")));
```

or using AssertJ with `XmlAssert` of the `xmlunit-assertj` module

```java

import static org.xmlunit.assertj.XmlAssert.assertThat;
...

assertThat(createTestDocument())
            .and(Input.fromFile("test-data/good.xml"))
            .areIdentical();
```

or using AssertJ with `XmlAssert` of the `xmlunit-assertj3` module

```java

import static org.xmlunit.assertj3.XmlAssert.assertThat;
...

assertThat(createTestDocument())
            .and(Input.fromFile("test-data/good.xml"))
            .areIdentical();
```

### Asserting an XPath Value

```java
Source source = Input.fromString("<foo>bar</foo>").build();
XPathEngine xpath = new JAXPXPathEngine();
Iterable<Node> allMatches = xpath.selectNodes("/foo", source);
assert allMatches.iterator().hasNext();
String content = xpath.evaluate("/foo/text()", source);
assert "bar".equals(content);
```

or using Hamcrest with `HasXPathMatcher`, `EvaluateXPathMatcher`

```java
assertThat("<foo>bar</foo>", HasXPathMatcher.hasXPath("/foo"));
assertThat("<foo>bar</foo>", EvaluateXPathMatcher.hasXPath("/foo/text()",
                                                           equalTo("bar")));
```

or using AssertJ with `XmlAssert` of the `xmlunit-assertj` module

```java

import static org.xmlunit.assertj.XmlAssert.assertThat;
...

assertThat("<foo>bar</foo>").hasXPath("/foo");
assertThat("<foo>bar</foo>").valueByXPath("/foo/text()").isEqualTo("bar");
```

or using AssertJ with `XmlAssert` of the `xmlunit-assertj3` module

```java

import static org.xmlunit.assertj3.XmlAssert.assertThat;
...

assertThat("<foo>bar</foo>").hasXPath("/foo");
assertThat("<foo>bar</foo>").valueByXPath("/foo/text()").isEqualTo("bar");
```

### Validating a Document Against an XML Schema

```java
Validator v = Validator.forLanguage(Languages.W3C_XML_SCHEMA_NS_URI);
v.setSchemaSources(Input.fromUri("http://example.com/some.xsd").build(),
                   Input.fromFile("local.xsd").build());
ValidationResult result = v.validateInstance(Input.fromDocument(createDocument()).build());
boolean valid = result.isValid();
Iterable<ValidationProblem> problems = result.getProblems();
```

or using Hamcrest with `ValidationMatcher`

```java
import static org.xmlunit.matchers.ValidationMatcher.valid;
...

assertThat(createDocument(), valid(Input.fromFile("local.xsd")));
```

or using AssertJ with `XmlAssert` of the `xmlunit-assertj` module

```java
import static org.xmlunit.assertj.XmlAssert.assertThat;
...

assertThat(createDocument()).isValidAgainst(Input.fromFile("local.xsd"));
```

or using AssertJ with `XmlAssert` of the `xmlunit-assertj3` module

```java
import static org.xmlunit.assertj3.XmlAssert.assertThat;
...

assertThat(createDocument()).isValidAgainst(Input.fromFile("local.xsd"));
```

## Requirements

Starting with version 2.8.0 XMLUnit requires Java 7, which has always
been the minimum requirement for the AssertJ module. All other modules
in versions 2.0.0 to 2.7.0 required Java 6. The `xmlunit-assertj3`
module requires Java 8 as does AssertJ 3.x itself.

The `core` library provides all functionality needed to test XML
output and hasn't got any dependencies.  It uses JUnit 4.x for its own
tests.

If you want to use `Input.fromJaxb` - i.e. you want to serialize plain Java objects to XML as input - then you may also
need to add a dependency on the JAXB implementation. For more details see the [User's
Guide](https://github.com/xmlunit/user-guide/wiki/JAXB).

The core library is complemented by Hamcrest 1.x matchers and AssertJ
assertions.  There also exists a `legacy` project that provides the
API of XMLUnit 1.x on top of the 2.x core library.

While the Hamcrest matchers are built against Hamcrest 1.x they are
supposed to work with Hamcrest 2.x as well.

Starting with XMLUnit 2.8.1 there are two different AssertJ modules,
`xmlunit-assertj` is the original implementation which is based on
AssertJ 2.x and also works for AssertJ 3.x but uses reflection to deal
with some changes in later versions of AssertJ. The `xmlunit-assertj3`
module requires at least AssertJ 3.18.1.

The `xmlunit-assertj` module depends on an internal package not
exported by AssertJ's OSGi module and thus doesn't work in an OSGi
context.

Another difference between the two AssertJ modules is the exception
thrown if a comparison fails. `xmlunit-assertj` will try to throw a
JUnit 4.x `ComparisonFailure` if the class is available and thus is
best suited for tests using JUnit 4.x. `xmlunit-assertj3` will try to
throw an [Open Test
Alliance](https://github.com/ota4j-team/opentest4j)
`AssertionFailedError` if the class is available and thus is better
suited for tests using JUnit 5.x.

## Checking out XMLUnit for Java

XMLUnit for Java uses a git submodule for test resources it shares
with XMLUnit.NET.  You can either clone this repository using `git
clone --recursive` or run `git submodule update --init` inside
your fresh working copy after cloning normally.

If you have checked out a working copy before we added the submodule,
you'll need to run `git submodule update --init` once.

## Building

XMLUnit for Java builds using Apache Maven 3.x, mainly you want to run

```sh
$ mvn install
```

in order to compile all modules and run the tests.

xmlunit

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