cactoos-matchers is an object-oriented wrapper around hamcrest's matchers.
Design principles behind cactoos-matchers.
This library depends on cactoos and hamcrest. Get the latest version here:
<dependency>
<groupId>org.llorllale</groupId>
<artifactId>cactoos-matchers</artifactId>
<version>${version}</version>
</dependency>
Java version required: 1.8+.
cactoos-matchers | Hamcrest (static method) | Hamcrest (object) | JUnit |
---|---|---|---|
Assertion |
MatcherAssert.assertThat |
- | Assert.assertThat |
Throws |
- | - | @expected + ExpectedException |
EndsWith |
Matchers.endsWith |
StringEndsWith |
- |
StartsWith |
Matcers.startsWith |
StringStartsWith |
- |
TextIs |
Matchers.is |
IsEqual |
- |
HasLines |
- | - | - |
MatchesRegex |
- | - | - |
TextHasString |
Matchers.stringContainsInOrder |
StringContains |
- |
FuncApplies |
- | - | - |
HasValues |
Matchers.containsInAnyOrder |
IsIterableContainingInAnyOrder |
- |
HasValuesMatching |
Matchers.containsInAnyOrder |
IsIterableContainingInAnyOrder |
- |
InputHasContent |
- | - | - |
IsTrue |
- | - | Assert.assertTrue |
Matches |
- | - | - |
RunsInThreads |
- | - | - |
ScalarHasValue |
- | - | - |
Use our matchers inside your JUnit @Test
case. We also provide Assertion<T>
in which you can compose the behavior under test and the test case's matcher, and attempt to affirm it.
We provide matchers for several different domains:
Examples:
@Test
public void textHasPrefix() {
final String prefix = "Application startup";
new Assertion<>(
"must have the prefix",
() -> new TextOf(new File("some.log")),
new StartsWith(prefix)
).affirm();
}
@Test
public void csvLineHasCorrectFormat() throws Exception {
final String fields = "^[^|]+|[^|]+|[^|]+$";
new Assertion<>(
"must match the expected pattern",
() -> new FirstOf<>(
line -> true,
new SplitText(
new TextOf(new File("report.csv")),
"\n"
)
).value(),
new MatchesRegex(fields)
).affirm();
}
@Test
public void textIsBlank() {
new Assertion<>(
"must be blank",
() -> new TextOf(new File("records.txt")),
new IsBlank()
).affirm();
}
Examples:
RunsInThreads
/**
* Want some assurance that your object is thread-safe?
*/
@Test
public void threadSafety() {
new Assertion<>(
"must be able to modify the map concurrently",
() -> map -> {
boolean success = true;
try {
map.forEach(
(key, value) -> {
map.remove(key);
final Random r = new Random();
map.put(r.nextInt(), r.nextInt());
}
);
} catch (ConcurrentModificationException ex) {
success = false;
}
return success;
},
new RunsInThreads<>(new ConcurrentHashMap<>(), 100)
).affirm();
}
Examples:
@Test
public void throwIllegalArgumentExceptionIfLessThan10() throws Exception {
final Func<Integer, Integer> test = input -> {
if (input < 10) {
throw new IllegalArgumentException();
}
return input * 10;
};
new Assertion<>(
"must throw illegalargumentexception if input is less than 10",
() -> test.apply(5),
new Throws(IllegalArgumentException.class)
).affirm();
}
Examples:
Use Matches
to test matchers themselves:
@Test
public void matchExactString() {
new Assertion<>(
"must match the exact text",
() -> new TextIs("abc"), // matcher being tested
new Matches<>(new TextOf("abc")) // reference against which the matcher is tested
).affirm();
}
Just fork the repo and send us a pull request.
Make sure your branch builds without any warnings/issues:
mvn clean install -Pqulice
Note: Checkstyle is used as a static code analyze tool with checks list in GitHub precommits.
- @llorllale as George Aristy
- @yegor256 as Yegor Bugayenko (Blog)
- @proshin-roman as Roman Proshin
- Nikita Salomatin
- @dgroup as Yurii Dubinka
Copyright (c) for portions of project cactoos-matchers are held by Yegor Bugayenko, 2017-2018, as part of project cactoos. All other copyright for project cactoos-matchers are held by George Aristy, 2018.
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.