BlahBlahTest.java

@DataProvider(name = "testStringProvider")
public Object[][] testStringProvider() {
    return new Object[][] {
        { "blue", "BLUE" },
        { "red", "RED"}
    };
}

@Test(dataProvider = "testStringProvider")
public void shouldConvertToUpperCase(String inputString, String expected ) {
    final String actual = inputString.toUpperCase();
    assertThat(actual, is(expected));
}