The org.hamcrest.Matchers hasSize() method is part of the Hamcrest library, which is a framework for writing unit tests in Java. This method is used to determine the size of a collection or map, and can be useful for checking that the expected number of entries are present in a data structure.
Example 1: Checking the Size of a List
List names = Arrays.asList("Alice", "Bob", "Charlie"); assertThat(names, hasSize(3));
This code creates a list of three names and uses the hasSize() method to check that the list contains exactly three elements. If the list had a different number of elements, the assertion would fail.
This code creates a map of three entries, with the names of the players as the keys and their scores as the values. The hasSize() method is used to check that the map contains exactly three entries.
The org.hamcrest.Matchers package is part of the Hamcrest library, which is an extension to the JUnit testing framework. It provides a range of utility methods for writing more expressive and readable unit tests in Java.
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