Assert regex matches in JUnit

Question

Ruby\'s Test::Unit has a nice assert_matches method that can be used in unit tests to assert that a regex matches a string.

Is there anythi

Answer 1

There is corresponding matcher in Hamcrest: org.hamcrest.Matchers.matchesPattern(String regex).

As development of Hamcrest stalled you can't use latest available v1.3:

testCompile("org.hamcrest:hamcrest-library:1.3")

Instead you need to use new dev series (but still dated by Jan 2015):

testCompile("org.hamcrest:java-hamcrest:2.0.0.0")

or even better:

configurations {
    testCompile.exclude group: "org.hamcrest", module: "hamcrest-core"
    testCompile.exclude group: "org.hamcrest", module: "hamcrest-library"
}
dependencies {
    testCompile("org.hamcrest:hamcrest-junit:2.0.0.0")
}

In test:

Assert.assertThat("123456", Matchers.matchesPattern("^[0-9]+$"));