angabe ue09

uebung09/test/iterator/Array2dIteratorTest.java

@@ -0,0 +1,43 @@
+package iterator;
+
+import org.junit.Test;
+
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThrows;
+import static org.junit.Assert.assertTrue;
+
+public class Array2dIteratorTest {
+    @Test
+    public void testArray2dIterator() {
+        final String[][] array = {{}, {"foo", "bar"}, {"baz"}, {}};
+        final Iterator<String> it = new Array2dIterator<>(array);
+        assertTrue(it.hasNext());
+        assertEquals("foo", it.next());
+        assertTrue(it.hasNext());
+        assertEquals("bar", it.next());
+        assertTrue(it.hasNext());
+        assertEquals("baz", it.next());
+        assertFalse(it.hasNext());
+        assertThrows(NoSuchElementException.class, it::next);
+    }
+
+    @Test
+    public void testArray2dIteratorOnlyEmpty() {
+        final String[][] array = {{}, {}, {}};
+        final Iterator<String> it = new Array2dIterator<>(array);
+        assertFalse(it.hasNext());
+        assertThrows(NoSuchElementException.class, it::next);
+    }
+
+    @Test
+    public void testArray2dIteratorEmpty() {
+        final String[][] array = {};
+        final Iterator<String> it = new Array2dIterator<>(array);
+        assertFalse(it.hasNext());
+        assertThrows(NoSuchElementException.class, it::next);
+    }
+}