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Merged
jbgi merged 1 commit into from
Aug 18, 2018
Merged

Add Reader/Writer tests #353

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16 changes: 15 additions & 1 deletion props-core/src/test/java/fj/data/ReaderTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@
import static fj.test.Cogen.cogenInteger;
import static fj.test.Property.prop;
import static fj.test.Property.property;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.assertTrue;

/**
Expand All @@ -24,7 +26,6 @@ public void testMap() {
// example taken from http://learnyouahaskell.com/for-a-few-monads-more
int x = Reader.unit((Integer i) -> i + 3).map(i -> i * 5).f(8);
assertTrue(x == 55);
// System.out.println(x); // 55
}

@Test
Expand Down Expand Up @@ -108,6 +109,19 @@ public void testAssociativity() {
PropertyAssert.assertResult(p);
}

@Test
public void testAndThen() {
final int y = Reader.unit((Integer i) -> i * 2).andThen(i -> i + 10).f(10);
assertThat(y, is(30));
}

@Test
public void testBind() {
final int y = Reader.unit((Integer i) -> i * 2)
.bind(a -> Reader.unit(i -> a + i + 11)).f(10);
assertThat(y, is(41));
}

public Gen<Reader<Integer, Integer>> arbReader() {
return Arbitrary.arbReader(cogenInteger, arbInteger);
}
Expand Down
14 changes: 10 additions & 4 deletions props-core/src/test/java/fj/data/WriterTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,7 @@

import fj.Equal;
import fj.F;
import fj.data.test.PropertyAssert;
import fj.test.Arbitrary;
import fj.P;
import fj.test.Gen;
import fj.test.Property;
import org.junit.Assert;
Expand All @@ -14,7 +13,8 @@
import static fj.test.Cogen.cogenInteger;
import static fj.test.Property.prop;
import static fj.test.Property.property;
import static org.junit.Assert.assertTrue;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.core.Is.is;

/**
* Created by MarkPerry on 17/12/2014.
Expand Down Expand Up @@ -107,7 +107,13 @@ public void testAssociativity() {
assertResult(p);
}


@Test
public void testUnit() {
Writer<String, String> w = Writer.unit("+").tell("foo").tell("bar");
assertThat(w.run(), is(P.p("foobar", "+")));
assertThat(w.log(), is("foobar"));
assertThat(w.value(), is("+"));
}


}