Merge pull request functionaljava#381 from gliptak/coverage21

gliptak · web-flow · commit 33a1e5d59107 · 2019-03-29T10:57:20.000-04:00
Add Integers tests
diff --git a/core/src/test/java/fj/function/IntegersTest.java b/core/src/test/java/fj/function/IntegersTest.java
@@ -0,0 +1,62 @@
+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);
+        }
+    }
+
+}
