Automation ROI calculation in Testing Fundamentals - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to calculate the total manual testing cost.

Testing Fundamentals

manual_cost = test_cases * [1]

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

Atime_per_test

Btest_suite

Cautomation_cost

Ddefect_rate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'automation_cost' instead of 'time_per_test'.

Using 'defect_rate' which is unrelated to time calculation.

The total manual testing cost is the number of test cases multiplied by the time taken per test.

2fill in blank

medium

Complete the code to calculate the total automation cost.

Testing Fundamentals

automation_total = [1] + maintenance_cost

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

Aautomation_cost

Bmanual_cost

Ctest_cases

Dtime_per_test

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'manual_cost' instead of 'automation_cost'.

Using 'test_cases' which is unrelated here.

The total automation cost includes the initial automation cost plus maintenance cost.

3fill in blank

hard

Fix the error in the ROI calculation formula.

Testing Fundamentals

roi = (manual_cost - [1]) / manual_cost * 100

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

Amaintenance_cost

Bautomation_cost

Ctest_cases

Dtime_per_test

Attempts:

3 left

💡 Hint

Common Mistakes

Subtracting maintenance_cost instead of automation_cost.

Dividing by automation_cost instead of manual_cost.

ROI is calculated by subtracting automation cost from manual cost, then dividing by manual cost.

4fill in blank

hard

Fill both blanks to calculate the payback period in months.

Testing Fundamentals

payback_period = [1] / [2]

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

Aautomation_cost

Bmonthly_savings

Cmanual_cost

Dmaintenance_cost

Attempts:

3 left

💡 Hint

Common Mistakes

Using manual_cost instead of automation_cost in numerator.

Using maintenance_cost instead of monthly_savings in denominator.

The payback period is the automation cost divided by monthly savings from automation.

5fill in blank

hard

Fill all three blanks to create a dictionary summarizing ROI details.

Testing Fundamentals

roi_summary = {"ROI": [1], "Payback": [2], "Cost": [3]

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

Aroi

Bpayback_period

Cautomation_cost

Dmanual_cost

Attempts:

3 left

💡 Hint

Common Mistakes

Using manual_cost instead of automation_cost for 'Cost'.

Mixing payback_period and roi values.

The dictionary holds ROI, payback period, and automation cost values for summary.

Practice

1. What does Automation ROI primarily measure in software testing?

easy

A. The cost savings from using automated tests compared to manual tests

B. The number of test cases automated

C. The speed of writing test scripts

D. The number of bugs found by automation

Solution

1. Step 1: Understand ROI meaning

   ROI (Return on Investment) measures how much money or value you get back from what you spend.

2. Step 2: Apply ROI to automation context

   In testing, Automation ROI compares the cost of automating tests to the money saved by running tests automatically instead of manually.

3. Final Answer:

   The cost savings from using automated tests compared to manual tests -> Option A

4. Quick Check:

   Automation ROI = Cost savings [OK]

Hint: ROI means money saved versus money spent [OK]

Common Mistakes:

• Confusing ROI with number of tests automated
• Thinking ROI measures speed only
• Believing ROI counts bugs found

2. Which formula correctly calculates Automation ROI?

easy

A. (Cost of Automation + Cost of Manual Testing) / Cost of Automation

B. (Cost of Automation - Cost of Manual Testing) / Cost of Automation

C. (Cost of Manual Testing - Cost of Automation) / Cost of Automation

D. (Cost of Manual Testing + Cost of Automation) / Cost of Manual Testing

Solution

1. Step 1: Recall ROI formula basics

   ROI = (Gain from investment - Cost of investment) / Cost of investment.

2. Step 2: Apply to automation costs

   Gain = Cost saved by automation = Cost of Manual Testing - Cost of Automation. So ROI = (Manual - Automation) / Automation.

3. Final Answer:

   (Cost of Manual Testing - Cost of Automation) / Cost of Automation -> Option C

4. Quick Check:

   ROI = (Manual - Automation) / Automation [OK]

Hint: ROI = (Manual cost - Automation cost) ÷ Automation cost [OK]

Common Mistakes:

• Reversing subtraction order
• Adding costs instead of subtracting
• Dividing by wrong cost

3. Given: Manual testing cost = $10,000, Automation cost = $4,000. What is the Automation ROI?

medium

A. 1.5

B. 0.6

C. 1.0

D. 0.4

Solution

1. Step 1: Identify values and formula

   Manual cost = 10000, Automation cost = 4000. ROI = (Manual - Automation) / Automation.

2. Step 2: Calculate ROI

   ROI = (10000 - 4000) / 4000 = 6000 / 4000 = 1.5.

3. Final Answer:

   1.5 -> Option A

4. Quick Check:

   ROI = (10000-4000)/4000 = 1.5 [OK]

Hint: Subtract then divide by automation cost [OK]

Common Mistakes:

• Dividing by manual cost instead of automation
• Adding costs instead of subtracting
• Mixing up manual and automation values

4. A tester calculates Automation ROI as (Automation Cost - Manual Cost) / Automation Cost. What is wrong with this formula?

medium

A. It divides by manual cost instead of automation cost

B. It subtracts in the wrong order, giving negative ROI when automation saves money

C. It adds costs instead of subtracting

D. It does not include test execution time

Solution

1. Step 1: Compare given formula to correct formula

   Correct ROI = (Manual Cost - Automation Cost) / Automation Cost. Given formula reverses subtraction.

2. Step 2: Understand impact of reversed subtraction

   If automation costs less, reversing subtraction yields negative ROI, wrongly suggesting loss.

3. Final Answer:

   It subtracts in the wrong order, giving negative ROI when automation saves money -> Option B

4. Quick Check:

   Subtraction order matters for correct ROI sign [OK]

Hint: Subtract manual minus automation, not reverse [OK]

Common Mistakes:

• Reversing subtraction order
• Dividing by wrong cost
• Ignoring subtraction sign impact

5. A company spends $15,000 on manual testing yearly. Automating tests costs $12,000 upfront but saves $5,000 yearly in manual effort. After 3 years, what is the total Automation ROI?

hard

A. 1.25

B. 0.5

C. 0.75

D. 0.25

Solution

1. Step 1: Calculate total savings over 3 years

   Savings = $5,000/year x 3 years = $15,000.

2. Step 2: Identify automation investment

   Cost of automation = $12,000 upfront.

3. Step 3: Calculate ROI

   ROI = (Savings - Automation cost) / Automation cost = (15,000 - 12,000) / 12,000 = 3,000 / 12,000 = 0.25.

4. Final Answer:

   0.25 -> Option D

5. Quick Check:

   ROI = (15000 - 12000) / 12000 = 0.25 [OK]

Hint: Calculate total costs and savings over years before ROI [OK]

Common Mistakes:

• Ignoring yearly savings in calculation
• Not multiplying costs by years
• Mixing upfront and recurring costs