Verify that the calculator performs basic arithmetic operations (addition, subtraction, multiplication, division) with two operands, each containing up to 15 digits, within 100 milliseconds, ensuring that the results are accurate.
Test the calculator with a large set of input values to ensure it can handle calculations efficiently without significant delays.
Measure the response time of the calculator when performing complex calculations, such as (50! / 25) * 3.14 + 1.618, to ensure it processes them without significant delays and delivers precise results.
Functional Test Cases:
Verify that the calculator correctly adds two positive numbers, for example, 123.45 + 67.89, and produces the expected result.
Test the calculator for accurate subtraction by performing operations like 1000 - (-200) and verifying the result.
Validate the calculator's multiplication functionality with various combinations of numbers, including a case like 12.345 * 0.1.
Ensure that the calculator accurately handles division, including division by zero, and produces clear messages for such cases.
Check if the calculator can perform calculations with decimal numbers and provide correct results, for instance, 3.14 * 2.5 or 1.0 / 3.
Non-Functional Test Cases:
Test the calculator's user interface for responsiveness and ease of use.
Verify that the calculator has appropriate error handling and displays clear error messages when invalid inputs are entered.
Evaluate the calculator's compatibility with different operating systems and devices.
Measure the memory usage of the calculator during complex calculations to ensure it is optimized.
Validate the calculator's accessibility features, such as support for screen readers or keyboard navigation.