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Merged
jbgi merged 1 commit into from
Jul 28, 2018
Merged

Add IOFunctions tests #340

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30 changes: 0 additions & 30 deletions core/src/test/java/fj/IOTest.java
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69 changes: 63 additions & 6 deletions core/src/test/java/fj/data/IOFunctionsTest.java
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Original file line number Diff line number Diff line change
@@ -1,14 +1,17 @@
package fj.data;

import fj.Unit;
import org.hamcrest.core.Is;
import fj.*;
import org.junit.Assert;
import org.junit.Test;

import java.io.*;
import java.io.Reader;
import java.util.concurrent.atomic.AtomicBoolean;

import static fj.data.IOFunctions.*;
import static fj.data.Stream.cons;
import static fj.data.Stream.nil_;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.*;

public class IOFunctionsTest {
Expand All @@ -30,8 +33,8 @@ public void close() {
r -> () -> new BufferedReader(r).readLine()
);

Assert.assertThat(bracketed.run(), Is.is("Read OK"));
Assert.assertThat(closed.get(), Is.is(true));
Assert.assertThat(bracketed.run(), is("Read OK"));
Assert.assertThat(closed.get(), is(true));
}

@Test
Expand All @@ -56,9 +59,63 @@ public void close() {
bracketed.run();
fail("Exception expected");
} catch (IllegalArgumentException e) {
Assert.assertThat(e.getMessage(), Is.is("OoO"));
Assert.assertThat(e.getMessage(), is("OoO"));
}
Assert.assertThat(closed.get(), Is.is(true));
Assert.assertThat(closed.get(), is(true));
}

@Test
public void testTraverseIO() throws IOException {
String[] as = {"foo1", "bar2", "foobar3"};
Stream<String> stream = Stream.arrayStream(as);
ByteArrayOutputStream outContent = new ByteArrayOutputStream();
PrintStream originalOut = System.out;
System.setOut(new PrintStream(outContent));
stream.traverseIO(IOFunctions::stdoutPrint).run();
System.setOut(originalOut);
assertThat(outContent.toString(), is("foobar3bar2foo1"));
}

@Test
public void testSequenceWhile() throws IOException {
BufferedReader r = new BufferedReader(new StringReader("foo1\nbar2\nfoobar3"));
Stream<IO<String>> s1 = Stream.repeat(() -> r.readLine());
IO<Stream<String>> io = sequenceWhile(s1, s -> !s.equals("foobar3"));
assertThat(io.run(), is(cons("foo1", () -> cons("bar2", () -> Stream.nil()))));
}

@Test
public void testForeach() throws IOException {
Stream<IO<String>> s1 = Stream.repeat(() -> "foo1");
IO<Stream<String>> io = sequence(s1.take(2));
ByteArrayOutputStream outContent = new ByteArrayOutputStream();
PrintStream originalOut = System.out;
System.setOut(new PrintStream(outContent));
runSafe(io).foreach(s -> runSafe(stdoutPrint(s)));
System.setOut(originalOut);
assertThat(outContent.toString(), is("foo1foo1"));
}


@Test
public void testReplicateM() throws IOException {
final IO<String> is = () -> new BufferedReader(new StringReader("foo")).readLine();
assertThat(replicateM(is, 3).run(), is(List.list("foo", "foo", "foo")));
}


@Test
public void testLift() throws IOException {
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@jbgi jbgi Jul 27, 2018

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is lift tested?

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@gliptak gliptak Jul 27, 2018

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just moved this code from the other Test.java I deleted

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"));
}

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

}