Enable code coverage with 90% patch requirement for Rust changes

.codecov.yml

@@ -0,0 +1,35 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT license.
+
+# Codecov configuration for DiskANN Rust code coverage
+# See: https://docs.codecov.com/docs/codecov-yaml
+
+coverage:
+  status:
+    # Project coverage (overall) - informational only
+    project:
+      default:
+        target: auto
+        threshold: 1%
+        informational: true
+
+    # Patch coverage (changed lines only) - this will block PRs
+    patch:
+      default:
+        target: 90%
+        threshold: 0%
+        informational: false
+
+comment:
+  layout: "reach,diff,flags,tree"
+  behavior: default
+  require_changes: false
+  require_base: false
+  require_head: true
+
+ignore:
+  - "test_data/**"
+  - "**/*_test.rs"
+  - "**/tests/**"
+  - "**/benches/**"
+  - "**/examples/**"

.github/workflows/ci.yml

@@ -158,51 +158,47 @@ jobs:
 
           cargo test --doc --workspace --profile ci
 
-  # coverage:
-  #   needs: basics
-  #   name: code coverage
-  #   runs-on: ubuntu-latest
-  #   steps:
-  #     - uses: actions/checkout@v4
-  #       with:
-  #         lfs: true
+  coverage:
+    needs: basics
+    name: code coverage
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          lfs: true
+          fetch-depth: 0
 
-  #     - name: Install Rust ${{ env.rust_stable }}
-  #       uses: dtolnay/rust-toolchain@stable
-  #       with:
-  #         toolchain: ${{ env.rust_stable }}
-  #         components: llvm-tools-preview
+      - name: Install Rust ${{ env.rust_stable }}
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: ${{ env.rust_stable }}
+          components: llvm-tools-preview
 
-  #     - name: Install cargo-llvm-cov
-  #       uses: taiki-e/install-action@v2
-  #       with:
-  #         tool: cargo-llvm-cov
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-llvm-cov
 
-  #     - name: Install cargo-nextest
-  #       uses: taiki-e/install-action@v2
-  #       with:
-  #         tool: cargo-nextest
+      - name: Install cargo-nextest
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cargo-nextest
 
-  #     - uses: Swatinem/rust-cache@v2
-  #     - name: Generate code coverage
-  #       run: |
-  #         cargo llvm-cov nextest --cargo-profile ci \
-  #           --package diskann-wide \
-  #           --package diskann-vector \
-  #           --package diskann-quantization \
-  #           --package diskann \
-  #           --package diskann-linalg \
-  #           --package diskann-utils \
-  #           --package diskann-disk \
-  #           --lcov --output-path lcov.info
-
-  #     - name: Upload coverage to Codecov
-  #       uses: codecov/codecov-action@v4
-  #       with:
-  #         files: lcov.info
-  #         fail_ci_if_error: false
-  #       env:
-  #         CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      - uses: Swatinem/rust-cache@v2
+
+      - name: Generate code coverage
+        run: |
+          cargo llvm-cov nextest --cargo-profile ci \
+            --workspace \
+            --lcov --output-path lcov.info
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          files: lcov.info
+          fail_ci_if_error: true
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
 
   # miri:
   #   needs: basics