Add JUnit for Doubles

gliptak · gliptak · commit 7d0d1031ff21 · 2016-02-06T12:20:54.000-05:00
diff --git a/core/src/test/java/fj/function/DoublesTest.java b/core/src/test/java/fj/function/DoublesTest.java
@@ -0,0 +1,61 @@
+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);
+        }
+    }
+
+}
