Verify a text in the dropdown - selenium

Question

I am trying to verify if the text is present in the dropdown menu. My assertion shows all the items, but with an error...expected[]but found[]. Please find below my script and the test failure message. Thanks in advance for the help!
My Script:
driver.findElement(By.cssSelector("#s2id_autogen4 > a.select2-choice > span")).click();;
ArrayList<String> expectedDropDownItems = new ArrayList<String>();
expectedDropDownItems.add("keysearch");
expectedDropDownItems.add("short");
expectedDropDownItems.add("standard");
expectedDropDownItems.add("to-date");
Assert.assertEquals(expectedDropDownItems, driver.findElement(By.xpath(".//*[#id='select2-drop']/ul")).getText());
ERROR MESSAGE:
java.lang.AssertionError: expected [keysearch
short
standard
to-date] but found [[keysearch, short, standard, to-date]]
HTML:
<div style="top: 1973px; left: 261px; width: 500px; display: block;" class="select2-drop select2-with-searchbox select2-drop-active" id="select2-drop">
<div class="select2-search">
<input type="text" class="select2-input" autocomplete="off" tabindex="0">
</div>
<ul class="select2-results" style="">
<li class="select2-results-dept-0 select2-result select2-result-selectable">
<div class="select2-result-label">
<span class="select2-match"></span>keysearch</div></li>
<li class="select2-results-dept-0 select2-result select2-result-selectable">
<div class="select2-result-label">
<span class="select2-match"></span>short</div></li>
<li class="select2-results-dept-0 select2-result select2-result-selectable">
<div class="select2-result-label">
<span class="select2-match"></span>standard</div></li>
<li class="select2-results-dept-0 select2-result select2-result-selectable" style="">
<div class="select2-result-label">
<span class="select2-match"></span>to-date</div></li></ul>
</div>

Answer 1

What you can do is,
1- First get all the elements of the dropdown.
2- Put it in a List
3- Iterate over the list, get texts of each element and then put it in a new ArrayList of Strings.
4- Assert using this ArrayList and the Original ArrayList of items.
Below code will help you out:
//Putting actual items in the Arraylist of expectedDropDownItems
ArrayList<String> expectedDropDownItems = new ArrayList<String>();
expectedDropDownItems.add("keysearch");
expectedDropDownItems.add("short");
expectedDropDownItems.add("standard");
expectedDropDownItems.add("to-date");
//Iterating over expected items and printing
System.out.println("\n--- Expected Items");
for(int i=0;i<expectedDropDownItems.size();i++)
System.out.println(expectedDropDownItems.get(i));
System.out.println("\n");
ArrayList<String> actualDropDownItems = new ArrayList<String>();
//Getting the list of all items in dropdown
List<WebElement> elements = driver.findElements(By.xpath("//div[#class='select2-result-label']"));
//Iterating over the list of dropdown, getting text of each element and adding the text to the Arraylist of actualDropDownItems
for(WebElement element : elements){
System.out.println("Adding element: "+ element.getText());
actualDropDownItems.add(element.getText());
}
//Iterating over actual items and printing
System.out.println("\n--- Actual Items");
for(int i=0;i<actualDropDownItems.size();i++)
System.out.println(actualDropDownItems.get(i));
//Asserting the ArrayLists if they are equal or not
Assert.assertEquals(expectedDropDownItems, actualDropDownItems);
System.out.println("Asserted text match");

Answer 2

According to assertion i can suppose and suggest to do next on attempt to fix your problem (p.s. i'm not good at java, but according my exp in C#):
1. Try to print data returned from driver.findElement(By.xpath(".//*[#id='select2-drop']/ul")).getText() code and make sure that this data really equals to your data from arrayList.
2. If data seem equal, try another assertion methods (such as Assert.That(object, matcher) (e.g. in C# in could be Assert.That(new[]{1}, Is.EquivalentTo(new[]{1}));), Assert.arrayEquals etc)
If both arrays are equal and asserts not help, please provide sample of html and we will try to solve that problem in other way.