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Add JUnit for Doubles #226

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Merged
mperry merged 1 commit into from
Feb 13, 2016
Merged

Add JUnit for Doubles #226

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61 changes: 61 additions & 0 deletions core/src/test/java/fj/function/DoublesTest.java
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Original file line number Diff line number Diff line change
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package fj.function;

import static org.junit.Assert.*;

import fj.F;
import org.junit.Test;

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

import static org.hamcrest.core.Is.is;

import static fj.data.List.list;

public class DoublesTest {

@Test
public void testSum() {
assertThat(Doubles.sum(list(3.0, 4.0, 5.0)), is(12.0));
}

@Test
public void testProduct() {
assertThat(Doubles.product(list(3.0, 4.0, 5.0)), is(60.0));
}

@Test
public void testAdd() {
assertThat(Doubles.add.f(10.0).f(20.0), is(30.0));
}

@Test
public void testMultiply() {
assertThat(Doubles.multiply.f(3.0).f(5.0), is(15.0));
}

@Test
public void testAbs() {
assertThat(Doubles.abs.f(-5.0), is(5.0));
}

@Test
public void testFromString() {
assertThat(Doubles.fromString().f("-123.45").some(), is(-123.45));
}

@Test
public void testCannotInstantiate() throws NoSuchMethodException, InvocationTargetException,
IllegalAccessException, InstantiationException {
Constructor<Doubles> constructor = Doubles.class.getDeclaredConstructor(new Class[0]);
constructor.setAccessible(true);
try {
constructor.newInstance(new Object[0]);
fail("expected InvocationTargetException");
} catch (InvocationTargetException ite) {
assertTrue(ite.getCause() instanceof UnsupportedOperationException);
}
}

}