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Mar 29, 2019
Merged

Add Integers tests #381

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62 changes: 62 additions & 0 deletions core/src/test/java/fj/function/IntegersTest.java
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Original file line number Diff line number Diff line change
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package fj.function;

import org.junit.Test;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

import static fj.data.List.list;
import static fj.data.Option.none;
import static org.hamcrest.core.Is.is;
import static org.junit.Assert.*;

public class IntegersTest {

@Test
public void testSum() {
assertThat(Integers.sum(list(3, 4, 5)), is(12));
}

@Test
public void testProduct() {
assertThat(Integers.product(list(3, 4, 5)), is(60));
}

@Test
public void testAdd() {
assertThat(Integers.add.f(10).f(20), is(30));
}

@Test
public void testMultiply() {
assertThat(Integers.multiply.f(3).f(5), is(15));
}

@Test
public void testAbs() {
assertThat(Integers.abs.f(-5), is(5));
}

@Test
public void testFromString() {
assertThat(Integers.fromString().f("-123").some(), is(-123));
}

@Test
public void testFromStringFail() {
assertThat(Integers.fromString().f("w"), is(none()));
}

@Test
public void testCannotInstantiate() throws NoSuchMethodException, IllegalAccessException, InstantiationException {
Constructor<Integers> constructor = Integers.class.getDeclaredConstructor();
constructor.setAccessible(true);
try {
constructor.newInstance();
fail("expected InvocationTargetException");
} catch (InvocationTargetException ite) {
assertTrue(ite.getCause() instanceof UnsupportedOperationException);
}
}

}