20 of the best prompts for diagnosing Always-Passing tests, step by step across 4 stages. Works with ChatGPT, Claude, and Gemini.
20 of the best prompts for diagnosing Always-Passing tests, step by step across 4 stages. Works with ChatGPT, Claude, and Gemini.
Published July 2, 2026
Tests that always pass can lead to false confidence in your code's correctness, making it difficult to identify real issues. If this problem persists, it may result in deploying flawed applications that fail in production. By following this guide, you will gain clarity on your test implementations and ensure they accurately reflect your code's behavior. Built across 4 distinct stages covering Diagnose the Wall, Isolate and Fix, Verify the Resolution and more, this guide gives you one expert prompt per step so you never have to write from scratch or guess what the AI needs. The prompts work in ChatGPT, Claude, and Gemini and are designed to get usable output on the first try.
Before attempting any fixes, check the output of your test suite to identify tests that are incorrectly passing. Look for any specific test cases that should fail but do not.
Quote the Test Output
Quote the output of the test suite for the function 'calculateSum' when the inputs are (2, 3). Compare this output with the expected result of 5. Identify any discrepancies between the actual output and the expected output, and provide a brief explanation for each discrepancy found. Format your response as a list of discrepancies, including the actual output and the expected output for clarity.
Paste the Test File
Please analyze the following test file: [TEST FILE NAME]. I need you to identify the structure of the test cases defined within it and evaluate whether they correspond correctly to the implementation of the function being tested. Provide a summary of your findings, including any discrepancies or areas for improvement in the test coverage.
Interpret the Test Instruction
Please interpret the test instruction for creating tests for the 'calculateSum' function. Explain what specific behaviors you aim to validate with these tests, including edge cases and expected outcomes. Provide a detailed breakdown of the different scenarios you will cover in your tests and how each scenario contributes to ensuring the function works correctly.
Expected vs. Actual Test Behavior
Compare the expected output and the actual output of the 'calculateSum' function for the inputs (2, 3). Clearly outline what the expected result should be and what the function is currently returning. Additionally, provide an analysis of any discrepancies between the expected and actual behavior, and suggest potential reasons for these differences. Format your response as a structured table with columns for Input, Expected Output, Actual Output, and Notes.
Identify Violated Constraints
Please analyze the test cases for the function 'calculateSum' and identify any specific rules or constraints that are being violated. For each violation, quote the exact clause from the documentation that outlines the expected behavior of the tests. Present your findings in a structured format, including the nature of the violation, the relevant clause, and any suggestions for correcting the test cases.
Target the specific test cases that are incorrectly passing and the logic that leads to this behavior. Focus on correcting the assertions or the test setup.
Correct the Assertion Logic
Please review the assertion logic in the file 'test_calculateSum.js', specifically at line 10. The current assertion checks if the result is greater than 0, which is incorrect. Update this assertion to check for equality with the expected output instead. Provide the corrected line of code and explain why this change is necessary for accurate testing.
Rewrite Test with Explicit Constraints
Rewrite the test case for the function 'calculateSum' located in the file 'test_calculateSum.js'. Ensure that the test explicitly checks for edge cases, including negative numbers and zero. The test should assert that the output from 'calculateSum' matches the expected sum for various input scenarios, including both positive and negative integers. Format the test case to clearly document each scenario being tested and the expected outcomes.
Scoped Change in Test Setup
Modify the setup function in the 'test_calculateSum.js' file to include edge cases for inputs such as (0, 0) and (-1, 1). Ensure that these cases are explicitly tested to prevent the tests from always passing. Provide the updated code snippet and explain how these edge cases impact the overall test coverage and reliability.
Enforce Test Format
Please update the file 'test_calculateSum.js' to enforce a consistent test format. Ensure that all tests follow the structure: 'expect(calculateSum(input)).toEqual(expectedOutput);'. Provide the complete updated code for the file, highlighting any changes made to achieve this consistency.
Check Test Dependencies
Please review the dependencies in the file 'test_calculateSum.js' to identify any that may impact the test outcomes. List all libraries that are imported, check their versions, and confirm that they are functioning as expected. Provide a summary of any issues found, along with recommendations for resolving them to ensure all tests pass consistently.
Confirm that the tests are now accurately reflecting the functionality of the code. Check the output of the test suite after making changes.
Run the Updated Test Suite
Please run the updated test suite for the function 'calculateSum'. Verify that all tests are passing and provide a detailed report of any failures, including their corresponding outputs and the reasons for the failures if applicable. Format the results in a clear table with columns for Test Name, Status (Pass/Fail), and Output.
Show the Diff of Changes
Please provide a detailed diff of the file 'test_calculateSum.js' that outlines the changes made before and after your modifications. Specifically, highlight the alterations in the assertions and test cases, and present the output in a clear format that distinguishes between the original and updated lines. Include comments explaining the purpose of each modification for better understanding.
Replay the Failing Scenario
Replay the scenario where the test for 'calculateSum' was previously passing incorrectly. Verify that the test now fails when the implementation of 'calculateSum' is incorrect. Provide a detailed explanation of the test case, including the input values used, the expected output, and the actual output when the implementation is faulty. Additionally, summarize any changes made to the implementation that may have affected the test results.
Check Edge Case Handling
Please verify the handling of edge cases for the input values (0, 0) and (-1, 1) in the code. Check that the outputs for these inputs match the expected results. Provide a detailed explanation of the test results, including any discrepancies found and suggestions for adjustments if the outputs do not align with expectations.
Confirm Test Output State
Please verify the output state of the test suite after implementing the changes. Confirm that all tests are passing and provide a detailed report of the final output, including any relevant logs or error messages if applicable. Format the report to clearly indicate the number of tests run, passed, and failed, along with any additional context that may be useful for understanding the results.
Create artefacts that ensure this issue does not recur in future test implementations. Focus on guidelines and checks for writing tests.
Test Coverage Requirement Prompt
Please generate a guideline for test coverage requirements in software development. The guideline should state: "All tests for functions must cover edge cases and expected outputs. Before any test is finalized, verify that it includes at least one edge case scenario." Format this as a clear and concise document that can be shared with the development team.
Test Assertion Format Guard
Please create a comment guard for the file 'test_calculateSum.js' that enforces the use of 'toEqual' for strict equality checks in all assertions. The comment should clearly state: "Ensure all assertions use 'toEqual' for strict equality checks. Avoid using 'toBe' unless necessary." Provide the final output in a format that can be directly pasted into the code.
Test Case Review Template
Please create a review template for test cases that ensures thorough validation before merging. The template should include sections for expected outputs, edge cases, and a list of cases covered. Additionally, include a section for any assumptions made during the test case development. Format the output as a structured document with clear headings for each section.
Self-Check Request for Tests
Please create a self-check request for tests that includes the following instructions: Before running tests, verify that all test cases include assertions for expected behavior and edge cases. If any assertions are missing, flag them for review. Format the output as a clear checklist that can be easily followed.
Test Implementation Convention Message
Draft a project convention message that outlines the required structure for test files. Specify that all test files must use 'describe()' for grouping related tests, 'it()' for defining individual test cases, and 'expect()' for making assertions. Emphasize the importance of adhering to this format strictly to ensure consistency and reliability in testing. Provide the finalized message in a clear and concise format.
Replit may not be correctly interpreting the expected outputs in your test cases, leading to false positives. Check the assertions in your test files to ensure they are validating the correct conditions.
Use Replit's built-in test runner to validate your tests. If tests are not failing when they should, review the setup and assertions for correctness.
Investigate the test cases to ensure they are correctly asserting the expected behavior. Replit may not be catching logical errors if the tests are not structured properly.
In Replit, you can modify your test files to include edge cases by using 'it()' blocks to define specific scenarios. Ensure that each edge case is covered with appropriate assertions.
If Replit's test runner is not reflecting changes, ensure that your test files are correctly linked to the code being tested. Check for any caching issues or stale test results.
AI Prompts for Diagnosing Always-Passing Tests
Tests that always pass can lead developers to believe their code is functioning correctly when it is not.
See promptsAI Prompts for Ensuring Tests Validate Correctly
Tests that always pass can mask underlying issues in the codebase.
See promptsAI Prompts for Correcting Always-Passing Tests
Tests that always pass can mask critical issues in your codebase, leading to undetected bugs.
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