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+            <element signature="e#1571#1572#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/MySet.java">
+    <entry file="file://$PROJECT_DIR$/src/test/java/MySetTest.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="212">
-          <caret line="82" column="11" lean-forward="true" selection-start-line="82" selection-start-column="11" selection-end-line="82" selection-end-column="11" />
+        <state relative-caret-position="2265">
+          <caret line="151" column="32" selection-start-line="151" selection-start-column="32" selection-end-line="151" selection-end-column="32" />
           <folding>
             <element signature="imports" expanded="true" />
-            <element signature="e#242#243#0" expanded="true" />
-            <element signature="e#286#287#0" expanded="true" />
-            <element signature="e#310#311#0" expanded="true" />
-            <element signature="e#350#351#0" expanded="true" />
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-            <element signature="e#1429#1430#0" expanded="true" />
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-            <element signature="e#1566#1567#0" expanded="true" />
-            <element signature="e#5170#5171#0" expanded="true" />
-            <element signature="e#5207#5208#0" expanded="true" />
+            <element signature="e#1872#1880#0" expanded="true" />
+            <element signature="e#9076#9084#0" expanded="true" />
+            <element signature="e#9579#9587#0" expanded="true" />
           </folding>
         </state>
       </provider>

src/main/java/MySet.java

 
     @Override
     public boolean containsAll(Collection c) {
-        return this.addAll(c);
-    }
-
+        boolean returnValue = true;
 
+        for (Object elem: c) {
+            if (!this.contains(elem)){
+                returnValue = false;
+                break;
+            }
+        }
+        return returnValue;
+    }
 
 }

src/test/java/MySetTest.java

     @Test
     public void containsAllLongBooleanTest() {
         // Given
-        boolean expected = true;
+        boolean expected = false;
         Long[] inputArray = {1L, 2L, 3L, 4L};
         ArrayList<Long> addAllArray = new ArrayList<>();
         addAllArray.add(5L); addAllArray.add(6L); addAllArray.add(7L);  addAllArray.add(1L); addAllArray.add(7L);
     }
 
     @Test
-    public void retainAllStringBooleanTest1() {
+    public void containAllStringBooleanTest() {
         // Given
-        boolean expected = false;
+        boolean expected = true;
         String[] inputArray = {"a", "2", "3", "4"};
-        ArrayList<String> retainAllArray = new ArrayList<>();
-        retainAllArray.add("5"); retainAllArray.add("b");
+
+        ArrayList<String> containAllArray = new ArrayList<>();
+        containAllArray.add("2"); containAllArray.add("4");
 
         MySet<String> mySet = new MySet<String>(inputArray);
 
         // When
-        boolean actual = mySet.retainAll(retainAllArray);
+        boolean actual = mySet.containsAll(containAllArray);
+
+        // Then
+        Assert.assertEquals(expected, actual);
+    }
+
+    @Test
+    public void containAllStringBooleanTest2() {
+        // Given
+        boolean expected = false;
+        String[] inputArray = {"4"};
+
+        ArrayList<String> containAllArray = new ArrayList<>();
+        containAllArray.add("2"); containAllArray.add("4");
+
+        MySet<String> mySet = new MySet<String>(inputArray);
+
+        // When
+        boolean actual = mySet.containsAll(containAllArray);
 
         // Then
         Assert.assertEquals(expected, actual);