JUnit5 Jupiter (9) @ParameterizedTest, @NullSource, @EmptySource, @NullAndEmptySource, @EnumSource

@NullSource, @EmptySource, @NullAndEmptySource

public class NullEmptyBlanksStringsTest {

    @ParameterizedTest 

    @NullSource     

    void nullString( String text) {
        assertTrue( text == null ); 

    }

    @ParameterizedTest 

    @EmptySource 

    @ValueSource( strings = {""," ","\t","\n"})
    void EmptyStrings(String text) {
        assertTrue( text.isEmpty() );     

    }

    @ParameterizedTest 

    @NullAndEmptySource 

    void nullAndEmptySourceNull( String text) {
        assertTrue( text == null ); 

    }

    @ParameterizedTest 

    @NullAndEmptySource 

    void nullAndEmptySourceEmpty( String text) {
        assertTrue( text.isEmpty() ); 

    }
}

 Run Test

@EnumSource

public class EnumSourceDemoTest {

    @ParameterizedTest 

    @EnumSource(TimeUnit.class)
    void testWithEnumSource( TimeUnit timeUnit){
        assertNotNull( timeUnit); 

    }

    @ParameterizedTest 

    @EnumSource( value = TimeUnit.class, names = { "DAYS", "HOURS" })
    void testWithEnumSourceInclude( TimeUnit timeUnit) {
        assertTrue( EnumSet.of( TimeUnit.DAYS, TimeUnit.HOURS).contains( timeUnit)); 

    }

    @ParameterizedTest 

    @EnumSource( value = TimeUnit.class, mode = EXCLUDE, names = {"DAYS","HOURS"})
    void testWithEnumSourceExclude( TimeUnit timeUnit) {
       assertFalse( EnumSet.of( TimeUnit.DAYS, TimeUnit.HOURS).contains( timeUnit)); 

       assertTrue( timeUnit.name().length() > 5); 

    }

    @ParameterizedTest 

    @EnumSource( value = TimeUnit.class, mode = MATCH_ALL, names = {"^(M|N).+SECONDS$"})
    void testWithEnumSourceRegEx( TimeUnit timeUnit) {
        String name = timeUnit.name(); 

        assertTrue( name.startsWith("M") || name.startsWith("N")); 

        assertTrue( name.endsWith("SECONDS")); 

    }
}

Run Test

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