BAEL-2725 Lists in Groovy

core-groovy/src/test/groovy/com/baeldung/lists/ListTest.groovy

@@ -0,0 +1,170 @@
+package com.baeldung.groovy.lists
+
+import static groovy.test.GroovyAssert.*
+import org.junit.Test
+
+class ListTest{
+
+    @Test
+    void testCreateList() {
+
+        def list = [1, 2, 3]
+        assertNotNull(list)
+
+        def listMix = ['A', "b", 1, true]
+        assertTrue(listMix == ['A', "b", 1, true])
+
+        def linkedList = [1, 2, 3] as LinkedList
+        assertTrue(linkedList instanceof LinkedList)
+
+        ArrayList arrList = [1, 2, 3]
+        assertTrue(arrList.class == ArrayList)
+
+        def list2 = new ArrayList(arrList)
+        assertTrue(list2 == arrList)
+
+        def list3 = arrList.clone()
+        assertTrue(list3 == arrList)
+    }
+
+    @Test
+    void testCreateEmptyList() {
+
+        def emptyList = []
+        assertTrue(emptyList.size() == 0)
+    }
+
+    @Test
+    void testCompareTwoLists() {
+
+        def list1 = [5, 6.0, 'p']
+        def list2 = [5, 6.0, 'p']
+        assertTrue(list1 == list2)
+    }
+
+    @Test
+    void testGetItemsFromList(){
+
+        def list = ["Hello", "World"]
+
+        assertTrue(list.get(1) == "World")
+        assertTrue(list[1] == "World")
+        assertTrue(list[-1] == "World")
+        assertTrue(list.getAt(1) == "World")
+        assertTrue(list.getAt(-2) == "Hello")
+    }
+
+    @Test
+    void testAddItemsToList() {
+
+        def list = []
+
+        list << 1
+        list.add("Apple")
+        assertTrue(list == [1, "Apple"])
+
+        list[2] = "Box"
+        list[4] = true
+        assertTrue(list == [1, "Apple", "Box", null, true])
+
+        list.add(1, 6.0)
+        assertTrue(list == [1, 6.0, "Apple", "Box", null, true])
+
+        def list2 = [1, 2]
+        list += list2
+        list += 12
+        assertTrue(list == [1, 6.0, "Apple", "Box", null, true, 1, 2, 12])
+    }
+
+    @Test
+    void testUpdateItemsInList() {
+
+        def list =[1, "Apple", 80, "App"]
+        list[1] = "Box"
+        list.set(2,90)
+        assertTrue(list == [1, "Box", 90, "App"])
+    }
+
+    @Test
+    void testRemoveItemsFromList(){
+
+        def list = [1, 2, 3, 4, 5, 5, 6, 6, 7]
+
+        list.remove(3)
+        assertTrue(list == [1, 2, 3, 5, 5, 6, 6, 7])
+
+        list.removeElement(5)
+        assertTrue(list == [1, 2, 3, 5, 6, 6, 7])
+
+        assertTrue(list - 6 == [1, 2, 3, 5, 7])
+    }
+
+    @Test
+    void testIteratingOnAList(){
+
+        def list = [1, "App", 3, 4]
+        list.each{ println it * 2}
+
+        list.eachWithIndex{ it, i -> println "$i : $it" }
+    }
+
+    @Test
+    void testCollectingToAnotherList(){
+
+        def list = ["Kay", "Henry", "Justin", "Tom"]
+        assertTrue(list.collect{"Hi " + it} == ["Hi Kay", "Hi Henry", "Hi Justin", "Hi Tom"])
+    }
+
+    @Test
+    void testJoinItemsInAList(){
+        assertTrue(["One", "Two", "Three"].join(",") == "One,Two,Three")
+    }
+
+    @Test
+    void testFilteringOnLists(){
+        def list = [2, 1, 3, 4, 5, 6, 76]
+
+        assertTrue(list.find{it > 3} == 4)
+
+        assertTrue(list.findAll{it > 3} == [4, 5, 6, 76])
+
+        assertTrue(list.findAll{ it instanceof Number} == [2, 1, 3, 4, 5, 6, 76])
+
+        assertFalse(list.every{ it < 6})
+
+        assertTrue(list.any{ it%2 == 0})
+
+        assertTrue(list.grep( Number )== [2, 1, 3, 4, 5, 6, 76])
+
+        assertTrue(list.grep{ it> 6 }== [76])
+    }
+
+    @Test
+    void testGetUniqueItemsInAList(){
+        assertTrue([1, 3, 3, 4].toUnique() == [1, 3, 4])
+
+        def list = [1, 3, 3, 4]
+        list.unique()
+        assertTrue(list == [1, 3, 4])
+
+        assertTrue(["A", "B", "Ba", "Bat", "Cat"].toUnique{ it.size()} == ["A", "Ba", "Bat"])
+    }
+
+    @Test
+    void testSorting(){
+
+        assertTrue([1, 2, 1, 0].sort() == [0, 1, 1, 2])
+        Comparator mc = {a,b -> a == b? 0: a < b? 1 : -1}
+
+        def list = [1, 2, 1, 0]
+        list.sort(mc)
+        assertTrue(list == [2, 1, 1, 0])
+
+        def list1 = ["na", "ppp", "as"]
+        assertTrue(list1.max() == "ppp")
+        
+        Comparator minc = {a,b -> a == b? 0: a < b? -1 : 1}
+        def list2 = [3, 2, 0, 7]
+        assertTrue(list2.min(minc) == 0)
+    }
+}