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Improve diskann-disk test coverage#1193

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Improve diskann-disk test coverage#1193
arrayka wants to merge 1 commit into
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u/arrayka/diskann-disk-tests3

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@arrayka

@arrayka arrayka commented Jun 20, 2026

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Adds 18 targeted unit tests to the diskann-disk crate covering previously
untested error paths, control flow branches, and pure functions.

Files with missing lines
Coverage Δ
.../checkpoint/checkpoint_record_manager_with_file.rs
96.20% <100.00%> (+1.81%)
diskann-disk/src/search/pq/pq_scratch.rs
100.00% <100.00%> (+10.00%)
...kann-disk/src/search/provider/disk_sector_graph.rs
97.70% <100.00%> (+0.75%)
diskann-disk/src/storage/quant/generator.rs
94.31% <100.00%> (+1.64%)
diskann-disk/src/utils/kmeans.rs
96.61% <100.00%> (+5.62%)
diskann-disk/src/utils/partition.rs
92.85% <100.00%> (+0.34%)
...kann-disk/src/build/chunking/continuation/utils.rs
93.90% <97.87%> (+3.61%)

Add 18 targeted unit tests covering previously untested error paths,
control flow branches, and pure functions across 7 files.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
@codecov-commenter

codecov-commenter commented Jun 20, 2026

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Codecov Report

❌ Patch coverage is 99.30556% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.15%. Comparing base (6681a62) to head (02c3fb6).

Files with missing lines Patch % Lines
...kann-disk/src/build/chunking/continuation/utils.rs 97.87% 2 Missing ⚠️
Additional details and impacted files

Impacted file tree graph

@@            Coverage Diff             @@
##             main    #1193      +/-   ##
==========================================
+ Coverage   90.08%   90.15%   +0.07%     
==========================================
  Files         487      487              
  Lines       92325    92613     +288     
==========================================
+ Hits        83167    83492     +325     
+ Misses       9158     9121      -37     
Flag Coverage Δ
miri 90.15% <99.30%> (+0.07%) ⬆️
unittests 89.80% <99.30%> (+0.07%) ⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines Coverage Δ
.../checkpoint/checkpoint_record_manager_with_file.rs 96.20% <100.00%> (+1.81%) ⬆️
diskann-disk/src/search/pq/pq_scratch.rs 100.00% <100.00%> (+10.00%) ⬆️
...kann-disk/src/search/provider/disk_sector_graph.rs 97.70% <100.00%> (+0.75%) ⬆️
diskann-disk/src/storage/quant/generator.rs 94.31% <100.00%> (+1.64%) ⬆️
diskann-disk/src/utils/kmeans.rs 96.61% <100.00%> (+5.62%) ⬆️
diskann-disk/src/utils/partition.rs 92.85% <100.00%> (+0.34%) ⬆️
...kann-disk/src/build/chunking/continuation/utils.rs 93.90% <97.87%> (+3.61%) ⬆️

... and 2 files with indirect coverage changes

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@arrayka arrayka marked this pull request as ready for review June 20, 2026 01:09
@arrayka arrayka requested review from a team and Copilot June 20, 2026 01:09
@arrayka arrayka enabled auto-merge (squash) June 20, 2026 01:09
@arrayka arrayka changed the title Improve diskann-disk test coverage: 94.4% → 95.0% Improve diskann-disk test coverage Jun 20, 2026

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Pull request overview

This PR increases unit test coverage in the diskann-disk crate by adding targeted tests for previously untested branches and error paths across utilities, PQ scratch handling, sector graph reconfiguration, quantization generator validation, continuation helpers, and checkpoint record management.

Changes:

  • Add unit tests for partition-count estimation edge cases (clamping, odd rounding, k_base multiplier).
  • Add tests covering error-path and basic-success behavior in k-means clustering, PQScratch query validation, quant generator parameter validation, sector graph reconfiguration/defaulting, continuation processing behavior, and checkpoint invalidation.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file
File Description
diskann-disk/src/utils/partition.rs Adds tests for estimate_initial_partition_count edge cases.
diskann-disk/src/utils/kmeans.rs Adds tests for successful clustering output shape and cancellation error path.
diskann-disk/src/storage/quant/generator.rs Adds test for missing compressed-file validation when resuming with offset.
diskann-disk/src/search/provider/disk_sector_graph.rs Adds tests for reconfigure growth/no-op and block-size defaulting.
diskann-disk/src/search/pq/pq_scratch.rs Adds tests for rejecting undersized queries and accepting oversized queries.
diskann-disk/src/build/chunking/continuation/utils.rs Adds tests for early stop, yield-then-continue, and error propagation (sync/async).
diskann-disk/src/build/chunking/checkpoint/checkpoint_record_manager_with_file.rs Adds tests for fresh-state behavior, missing-file completion state, and invalidation semantics.

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Comment on lines +137 to +141
// Query shorter than dim should fail
let short_query: Vec<f32> = (1..dim).map(|i| i as f32).collect(); // dim-1 elements
let err = pq_scratch.set(&short_query).unwrap_err();
assert!(err.to_string().contains("expected query of length"));
}
Comment on lines +630 to +634
let err = generator.validate_params(num_points, &storage_provider);
assert!(err.is_err());
let err_msg = format!("{:?}", err.unwrap_err());
assert!(err_msg.contains("expected compressed file"));

Comment on lines +209 to +212
if !*yielded {
*yielded = true;
ContinuationGrant::Yield(std::time::Duration::from_millis(1))
} else {
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3 participants