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interval-guided-regression-test-update

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Automatically updates regression tests based on interval analysis to maintain coverage of key program intervals. Use when code changes affect value ranges, conditionals, or control flow, and existing tests need updating to maintain interval coverage. Analyzes interval information from updated code, identifies coverage gaps, adjusts test inputs and assertions, removes redundant tests, and generates new tests for uncovered intervals. Supports Python, Java, JavaScript, and C/C++ with various test frameworks (pytest, JUnit, Jest, Google Test).

skills/interval-guided-regression-test-update/SKILL.md

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Aug 21, 2026
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# Interval-Guided Regression Test Update

Automatically update regression tests to maintain interval coverage when program code changes.

## Core Concept

**Intervals** represent ranges of values that variables can take during execution. When code changes, intervals may be added, removed, or modified. This skill ensures regression tests continue to cover all important intervals.

**Example:**
```python
# Old code
def process(x):
    if x < 10:
        return x * 2
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