AssertContains on strings in jUnit

问题:

Is there a nicer way to write in jUnit

String x = "foo bar";
Assert.assertTrue(x.contains("foo"));

回答1:

If you add in Hamcrest and JUnit4, you could do:

String x = "foo bar";
Assert.assertThat(x, CoreMatchers.containsString("foo"));

With some static imports, it looks a lot better:

assertThat(x, containsString("foo"));

The static imports needed would be:

import static org.junit.Assert.assertThat;
import static org.hamcrest.CoreMatchers.containsString;

回答2:

use fest assert 2.0 whenever possible EDIT: assertj may have more assertions (a fork)

assertThat(x).contains("foo");

回答3:

Use hamcrest Matcher containsString()

// Hamcrest assertion
assertThat(person.getName(), containsString("myName"));

// Error Message
java.lang.AssertionError:
Expected: a string containing "myName"
     got: "some other name"

You can optional add an even more detail error message.

// Hamcrest assertion with custom error message
assertThat("my error message", person.getName(), containsString("myName"));

// Error Message
java.lang.AssertionError: my error message
Expected: a string containing "myName"
     got: "some other name"

Posted my answer to a duplicate question here

回答4:

Use the new assertThat syntax together with Hamcrest.

It is available starting with JUnit 4.4.

回答5:

Another variant is

Assert.assertThat(actual, new Matches(expectedRegex));

Moreover in org.mockito.internal.matchers there are some other interesting matchers, like StartWith, Contains etc.

回答6:

I've tried out many answers on this page, none really worked:

• org.hamcrest.CoreMatchers.containsString does not compile, cannot resolve method.
• JUnitMatchers.containsString is depricated (and refers to CoreMatchers.containsString).
• org.hamcrest.Matchers.containsString: NoSuchMethodError

So I stopped trying to make nicely readable code, but used the simple and workable approach mentioned in the question instead.