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Add test for IO #272

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Merged
mperry merged 1 commit into from
Jun 19, 2016
Merged

Add test for IO #272

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30 changes: 30 additions & 0 deletions core/src/test/java/fj/IOTest.java
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package fj;

import fj.data.IO;
import fj.data.IOFunctions;
import org.junit.Test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;

import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;


public class IOTest {

@Test
public void testLift() throws IOException {
final IO<String> readName = () -> new BufferedReader(new StringReader("foo")).readLine();
final F<String, IO<String>> upperCaseAndPrint = F1Functions.<String, IO<String>, String>o(this::println).f(String::toUpperCase);
final IO<String> readAndPrintUpperCasedName = IOFunctions.bind(readName, upperCaseAndPrint);
assertThat(readAndPrintUpperCasedName.run(), is("FOO"));
}

public IO<String> println(final String s) {
return () -> {
return s;
};
}
}