Tests - GZIP Compression Module

Overview

These tests verify that the GZIP compression module correctly compresses HTTP responses and preserves the original response data.

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Test 1: GZIP Compression Enabled

testInput: 'Client requests a text file with Accept-Encoding: gzip'

expectedBehavior: 'Server responds successfully and includes the Content-Encoding: gzip header'

This verifies that GZIP compression is enabled when the client advertises support for it.

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Test 2: GZIP Response Decompression

testInput: 'Client requests a text file with Accept-Encoding: gzip and saves the response body'

expectedBehavior: 'The received response can be successfully decompressed as a GZIP stream'

This verifies that the server generates a valid GZIP stream.

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Test 3: Decompressed Content Matches Original

testInput: 'Client requests a file with Accept-Encoding: gzip, decompresses the response, and compares it with the original file'

expectedBehavior: 'The decompressed response is identical to the original file'

The comparison should be byte-for-byte to ensure that compression does not corrupt or modify the response.

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Test 4: Client Does Not Support GZIP

testInput: 'Client requests a text file without advertising GZIP support'

expectedBehavior: 'Server sends the normal uncompressed response and does not include Content-Encoding: gzip'

This verifies that the server does not send compressed data to clients that have not requested or accepted it.

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Test 5: Large File Compression

testInput: 'Client requests a large text file with Accept-Encoding: gzip'

expectedBehavior: 'Server returns a valid GZIP response that can be completely decompressed and matches the original large file'

This test is important because the compressed output may be larger than a single output buffer.

The compressor must therefore correctly handle multiple calls to deflate() and multiple output buffers.

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Test 6: GZIP Stream Finalization

testInput: 'Client requests a file with Accept-Encoding: gzip and waits until the complete response is received'

expectedBehavior: 'The complete response can be decompressed successfully, including the final bytes of the file'

This verifies that the compression stream is correctly finalized when the input ends.

The expected flow is:

This test is particularly important for ensuring that the GZIP trailer and any remaining compressed data are generated correctly.