Gemini Unit Test Generator

Analyzes source code files (JavaScript, Python, Java, PHP, etc.) and generates complete unit test suites using Gemini 2.0's code understanding. The extension parses the active editor's code context, sends it to Gemini's API with framework-specific prompts, and returns test code formatted for the detected or user-selected testing framework (Jest, Pytest, Mocha, PHPUnit, etc.). Uses VS Code's language detection and file extension matching to infer the appropriate test syntax and assertion library.

Extracts function signatures, parameters, and return types from source code and uses Gemini 2.0 to generate multiple test scenarios covering happy paths, edge cases, error conditions, and boundary values. The extension parses the AST or uses regex-based pattern matching to identify function definitions, then constructs a prompt that includes parameter types and docstrings to guide Gemini toward comprehensive test case generation. Returns multiple test cases per function organized by scenario type (normal, error, boundary).

Integrates with VS Code's editor API to insert generated test code directly into the active editor or create new test files following framework conventions (e.g., `*.test.js`, `*_test.py`, `*Test.java`). The extension detects the project structure, identifies the appropriate test directory (e.g., `__tests__`, `test/`, `tests/`), and uses VS Code's file system API to create or append test code. Supports both inline insertion (for quick edits) and separate file creation (for organized test suites).

Analyzes the project's package.json, requirements.txt, pom.xml, or other dependency files to detect installed testing frameworks, then adapts generated test code to match the detected framework's syntax and conventions. The extension uses regex and JSON parsing to identify framework versions and configurations, then passes this metadata to Gemini 2.0 to ensure generated tests use the correct assertion library, mocking approach, and test structure. Falls back to language-specific defaults if no framework is detected.

Analyzes existing test files and source code to identify untested functions, uncovered branches, and missing test scenarios. The extension parses the source code AST to extract all functions and compares them against test file imports and function calls to identify gaps. Uses Gemini 2.0 to reason about which untested functions are highest-priority based on complexity and public API exposure, then recommends test generation for those functions. Returns a prioritized list of functions to test with suggested test scenarios.

Analyzes generated test code using Gemini 2.0 to assess quality, identify potential issues (e.g., flaky tests, missing assertions, poor naming), and suggest improvements. The extension sends generated test code to Gemini with a prompt asking for code review feedback, then returns a structured assessment including quality score, identified issues, and specific recommendations. Provides inline VS Code diagnostics highlighting problematic test patterns.

Extends single-function test generation to process entire source files or directory trees, generating test suites for all functions in batch. The extension iterates through source files, extracts all function definitions, and submits them to Gemini 2.0 in optimized batches (respecting API rate limits and context window constraints). Organizes generated tests by source file and creates corresponding test files in the project structure. Includes progress tracking and error handling for partial failures.