Custom expected conditions in Selenium Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a custom expected condition that waits for an element to be visible.

Selenium Python

class element_visible:
    def __init__(self, locator):
        self.locator = locator

    def __call__(self, driver):
        element = driver.find_element(*self.locator)
        return element if element.is_displayed() [1] None

Drag options to blanks, or click blank then click option'

Aelse

Bor

Cand

Dif

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'if' instead of 'or' causes syntax errors.

Returning the element without checking visibility.

Returning True/False instead of element or None.

The 'or' operator returns the element if it is displayed; otherwise, it returns None, which is the expected behavior for a custom expected condition.

2fill in blank

medium

Complete the code to define a custom expected condition that waits for the page title to contain a specific word.

Selenium Python

class title_contains_word:
    def __init__(self, word):
        self.word = word

    def __call__(self, driver):
        return self.word in driver.title [1] False

Drag options to blanks, or click blank then click option'

Aand

Bor

Cif

Delse

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or False' which always returns True.

Returning the expression without ensuring a boolean result.

Using 'if' or 'else' incorrectly in a return statement.

Using 'and False' ensures the expression returns True if the word is in the title, otherwise False, which is required for expected conditions.

3fill in blank

hard

Fix the error in the custom expected condition that waits for an element's text to equal a given value.

Selenium Python

class text_to_be_equal:
    def __init__(self, locator, text):
        self.locator = locator
        self.text = text

    def __call__(self, driver):
        element = driver.find_element(*self.locator)
        return element.text == self.text [1] element

Drag options to blanks, or click blank then click option'

Aelse

Bor

Cif

Dand

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or element' which returns element even if text does not match.

Returning True/False instead of element or False.

Using 'if' or 'else' incorrectly in return.

Using 'and element' returns the element if the text matches, otherwise returns False, which is the expected behavior for expected conditions.

4fill in blank

hard

Fill both blanks to create a custom expected condition that waits for an element to be clickable.

Selenium Python

from selenium.webdriver.support import expected_conditions as EC

class element_to_be_clickable_custom:
    def __init__(self, locator):
        self.locator = locator

    def __call__(self, driver):
        element = driver.find_element(*self.locator)
        return element.is_enabled() [1] element.is_displayed() [2] element

Drag options to blanks, or click blank then click option'

Aand

Bor

Cif

Delse

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'or' which returns element if only one condition is true.

Using 'if' or 'else' in return statement.

Returning True/False instead of element or None.

Both conditions must be true for the element to be clickable, so 'and' is used to combine them and return the element if true.

5fill in blank

hard

Fill all three blanks to create a custom expected condition that waits for an element's attribute to have a specific value.

Selenium Python

class attribute_value_is:
    def __init__(self, locator, attribute, value):
        self.locator = locator
        self.attribute = attribute
        self.value = value

    def __call__(self, driver):
        element = driver.find_element(*self.locator)
        attr_value = element.get_attribute([1])
        return attr_value == [2] [3] element

Drag options to blanks, or click blank then click option'

Aself.attribute

Bself.value

Cand

Dor

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names for attribute or value.

Using 'or' which returns element even if values don't match.

Returning True/False instead of element or None.

We get the attribute using self.attribute, compare it to self.value, and use 'and' to return the element if the condition is true.

Practice

1. What is the main purpose of creating a custom expected condition in Selenium Python?

easy

A. To change the browser window size automatically

B. To speed up the browser loading time

C. To wait for a specific condition that is not covered by built-in expected conditions

D. To generate test reports automatically

Solution

1. Step 1: Understand built-in expected conditions

   Built-in expected conditions cover common waits like element visibility or clickability.

2. Step 2: Identify the need for custom conditions

   When a specific wait is not available, custom expected conditions let you define exactly what to wait for.

3. Final Answer:

   To wait for a specific condition that is not covered by built-in expected conditions -> Option C

4. Quick Check:

   Custom expected conditions = wait for custom needs [OK]

Hint: Custom conditions handle waits built-ins can't cover [OK]

Common Mistakes:

• Thinking custom conditions speed up browser loading
• Confusing custom conditions with browser resizing
• Assuming custom conditions generate reports

2. Which of the following is the correct way to define a custom expected condition class in Selenium Python?

easy

A. class MyCondition:
def __call__(self, driver):
return driver.title == 'Home'

B. def MyCondition(driver):
return driver.title == 'Home'

C. class MyCondition:
def call(self, driver):
return driver.title == 'Home'

D. class MyCondition:
def __init__(self, driver):
return driver.title == 'Home'

Solution

1. Step 1: Recall the special method for callable classes

   The method __call__ makes an instance callable like a function.

2. Step 2: Check method signature and return

   The __call__ method takes driver and returns a boolean or element to wait for.

3. Final Answer:

   class MyCondition:\n def __call__(self, driver):\n return driver.title == 'Home' -> Option A

4. Quick Check:

   Custom condition class needs __call__ method [OK]

Hint: Use __call__ method to make class callable [OK]

Common Mistakes:

• Using call instead of __call__ method
• Defining __init__ to return a value
• Defining a function instead of a class

3. Given this custom expected condition class, what will WebDriverWait(driver, 10).until(MyCondition()) return if the page title is 'Dashboard'?

class MyCondition:
    def __call__(self, driver):
        if driver.title == 'Dashboard':
            return True
        else:
            return False

medium

A. It will raise a TimeoutException immediately

B. It will return the driver object

C. It will return False immediately without waiting

D. It will wait until the title is 'Dashboard' and then return True

Solution

1. Step 1: Understand WebDriverWait with custom condition

   WebDriverWait calls the condition repeatedly until it returns a truthy value or timeout.

2. Step 2: Analyze the condition's return value

   If the title is 'Dashboard', __call__ returns True, so wait ends and returns True.

3. Final Answer:

   It will wait until the title is 'Dashboard' and then return True -> Option D

4. Quick Check:

   Condition returns True -> wait ends successfully [OK]

Hint: Wait ends when condition returns True [OK]

Common Mistakes:

• Thinking it raises TimeoutException immediately
• Assuming it returns False immediately
• Confusing return value with driver object

4. Identify the error in this custom expected condition class:

class ElementHasText:
    def __call__(self, driver):
        element = driver.find_element(By.ID, 'msg')
        if element.text:
            return element.text
        else:
            return False

medium

A. Missing import for By from selenium.webdriver.common.by

B. The __call__ method should return True or False only, not text

C. The class should inherit from WebDriverWait

D. The find_element method should be find_elements

Solution

1. Step 1: Check usage of By.ID in the code

   The code uses By.ID but does not import By, causing a NameError.

2. Step 2: Verify other parts of the code

   Returning element.text is valid for expected conditions; inheritance from WebDriverWait is not required.

3. Final Answer:

   Missing import for By from selenium.webdriver.common.by -> Option A

4. Quick Check:

   Using By requires importing it first [OK]

Hint: Always import By before using it [OK]

Common Mistakes:

• Assuming __call__ must return only True/False
• Thinking class must inherit WebDriverWait
• Confusing find_element with find_elements

5. You want to create a custom expected condition that waits until an element with ID 'status' has text containing the word 'Complete'. Which of these implementations is correct and efficient?

hard

A. class StatusComplete:
def __call__(self, driver):
element = driver.find_element(By.ID, 'status')
return element.text.startswith('Complete')

B. class StatusComplete:
def __call__(self, driver):
element = driver.find_element(By.ID, 'status')
return 'Complete' in element.text

C. class StatusComplete:
def __call__(self, driver):
element = driver.find_element(By.ID, 'status')
if element.text == 'Complete':
return True
else:
return False

D. class StatusComplete:
def __call__(self, driver):
element = driver.find_element(By.ID, 'status')
return element.text != ''

Solution

1. Step 1: Understand the requirement

   We want to wait until the text contains the word 'Complete' anywhere inside.

2. Step 2: Analyze each option's condition

   class StatusComplete: def __call__(self, driver): element = driver.find_element(By.ID, 'status') return 'Complete' in element.text checks if 'Complete' is in element.text, which matches the requirement exactly and returns a boolean.

3. Step 3: Compare other options

   class StatusComplete: def __call__(self, driver): element = driver.find_element(By.ID, 'status') if element.text == 'Complete': return True else: return False checks exact equality, which is too strict. class StatusComplete: def __call__(self, driver): element = driver.find_element(By.ID, 'status') return element.text.startswith('Complete') checks startswith, which is partial. class StatusComplete: def __call__(self, driver): element = driver.find_element(By.ID, 'status') return element.text != '' only checks non-empty text, which is too broad.

4. Final Answer:

   class StatusComplete:\n def __call__(self, driver):\n element = driver.find_element(By.ID, 'status')\n return 'Complete' in element.text -> Option B

5. Quick Check:

   Use 'in' to check substring presence [OK]

Hint: Use 'in' operator to check substring in text [OK]

Common Mistakes:

• Checking exact equality instead of substring
• Using startswith instead of contains
• Checking only for non-empty text