Create a dummy file of a requested size for testing file uploads, storage limits, validators, APIs, and other file-handling code.

Examples: 1 byte file, 500 KB, 20 MB, 1 GB (within configured limits). Content can be random bytes, zeros, or repeating text.

Generate a test image (JPEG, PNG, WEBP, BMP) with configurable dimensions, patterns, and approximate target file size.

Examples: 8000x8000 JPEG, approximately 20 MB JPEG, checkerboard PNG.

Generate a PDF test fixture with a specified number of pages.

Examples: 100 blank pages, 200-page PDF with sample text, ~30 MB PDF.

Generate a CSV test fixture with synthetic data, streamed to disk.

Examples: 0 rows, 100,000 rows, 1,000,000 rows (within configured limits).

Generate a JSON test fixture. Set malformed=true for intentionally invalid JSON.

Examples: valid JSON array, malformed JSON with trailing comma or missing bracket.

Generate a ZIP archive test fixture.

Examples: empty ZIP, ZIP with 100 files, nested directory structure.

Generate a WAV audio test fixture.

Examples: 30-second silent WAV, 5-second 440 Hz tone.

Create a corrupted copy of a file for testing error handling. Never modifies the original.

Examples: corrupted JPEG, PDF truncated at 70%, ZIP with random bytes, PNG with wrong extension.

Generate a file with an edge-case filename for upload/path testing.

Cases: spaces, unicode, very_long, multiple_dots, uppercase_extension, no_extension, hidden.

Inspect a generated test file and return metadata (size, MIME type, SHA256, etc.).