auto_loan_calulator-test

Test plan, test cases, and automated test scripts for auto load calculator found at https://www.bankrate.com/calculators/auto/auto-loan-calculator.aspx. The automated scripts are written in Cypress, a javascript test framework.

Test conditions

page load

• loads defaults

page refresh

• loads defaults

principal

• alpha
• less than 1000
• more than 100000

term

• select length

new/used

• select type

rate

• alpha
• multiple "."
• negative
• 99% or greater

find rate

• click

help

• principal
• term

output

• payment
• total princ
• total interest

algorithm

• 36 new/used
• 48 new/used
• 60 new/used
• 72 new

Test Cases

Verify that the web app loads with default values

Steps:

• Load page from URL.

Expect results:

• Fields should be filled in and outputs displays.
  • principal = 15000
  • term = 60 months
  • type = used
  • rate = 3

Verify that reloading the web app resets the values to the default values after changing them.

Steps:

• Load page from URL.
• Change values.
• Reload page.

Expect results:

• Fields should be filled in and outputs displays.
  • principal = 15000
  • term = 60 months
  • type = used
  • rate = 3

Verify that the principal field takes a number between 1000 and 100000

Steps:

• Load page from URL
• Enter a number from 1000 to 100000 (inclusive) in the "How much are you looking to borrow?" field.

Expected results:

• Value is displayed in black font color with blue line under text box

Verify that the principal field rejects any other input

Steps:

• Load page from URL
• Enter invalid input in the "How much are you looking to borrow?" field.

Expected results:

• Non-numerical characters are not displayed. A number less that 1000 or greater than 100000 is displayed in orange font color and bar under text entry box is orange.

Verify that the term can be selected.

Steps:

• Load page from URL
• Click on entry field for "For how long?"
• Click on any value

Expected results:

• Value is displayed in the field

Verify that the type of loan is selectable.

Steps:

• Load page from URL
• Click on the entry field for "Is your vehicle new or used?"
• Click on any value.

Expected results:

• Value is displayed in the field

Verify that the interest takes decimal number between 0.0 and 99.0.

Steps:

• Load page from URL
• Enter a decimal number between 0.0 and 99.0 in the "Interest rate" text input box.
• Hit enter of click outside the text input box

Expected results:

• Entered value is displayed in black font with a blue line under the text box

Verify that the interest field rejects all other values

Steps:

• Load page from URL
• Enter a non-numerical number, more than one "." (decimal point), a value 0 or less, or a value 99 or greater.

Expected results:

• Entered value is displayed in orange font color, orange line is under the text box, and "Invalid rate" is displayed under the text box.

Verify "Find rate box" displays text

Steps:

• Load page from URL
• Click on "Find rate box"

Expected results: Dropdown is displayed with "Choose an available rate from a lender below"

Verify the help for principal displays text

Steps:

• Load page from URL
• Click on "i" to the right of "How much are you looking to borrow?"

Expected results:

• Text box is displayed with the help text

Verify the help for term displays text

Steps:

• Load page from URL
• Click on "i" to the right of "For how long?"

Expected results:

• Text box is displayed with the help text

Verify any change to principal, term, type, rate updates the outputs

Steps:

• Load page from URL
• Change any of the principal, term, type, or rate fields to a new value

Expected results:

• Monthly payment, Total principal paid, and Total interest paid, should update.

Verify the algorithm to calculate outputs is correct

Steps: Enter values for inputs. Compare results with output from the following formulae:

• Monthly payment: A=P*(r(1+r)^{n})/((1+r)^{n}-1)}

One set of inputs:

• principal = 15000
• term = 60 months
• type = used
• rate = 3

Expected results:

• payment = 270
• princ paid = 15000
• intereset paid = 1172