test: bring tarpaulin coverage back up

.github/workflows/ci.yml

@@ -126,20 +126,20 @@ jobs:
       - name: Run all examples
         run: ./scripts/run_examples.sh
 
-  # coverage:
-  #   name: Code Coverage
-  #   runs-on: ubuntu-latest
-  #   steps:
-  #     - uses: actions/checkout@v4
+  coverage:
+    name: Code Coverage
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
 
-  #     - name: Install Rust
-  #       uses: dtolnay/rust-toolchain@stable
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
 
-  #     - name: Install cargo-tarpaulin
-  #     - uses: taiki-e/install-action@cargo-tarpaulin
+      - name: Install cargo-tarpaulin
+      - uses: taiki-e/install-action@cargo-tarpaulin
 
-  #     - name: Generate code coverage
-  #       run: cargo tarpaulin --lib --all-features --out Xml --out Lcov --output-dir coverage --fail-under 80
+      - name: Generate code coverage
+        run: cargo tarpaulin --out Xml --out Lcov --output-dir coverage --fail-under 80
 
   security:
     name: Security Audit

scripts/release_check.sh

@@ -218,12 +218,12 @@ check_pass "LICENSE files present in both crates"
 section "COVERAGE CHECK"
 
 echo "→ Running coverage analysis..."
-COVERAGE=$(cargo tarpaulin --lib --all-features --out Stdout 2>&1 | grep -oP '^\d+\.\d+%' | head -1 | sed 's/%//')
+COVERAGE=$(cargo tarpaulin --out Stdout 2>&1 | grep -oP '^\d+\.\d+%' | head -1 | sed 's/%//')
 if [ -z "$COVERAGE" ]; then
 	check_warn "Could not determine coverage percentage"
 else
 	echo "  Current coverage: ${COVERAGE}%"
-  if (( $(echo "$COVERAGE < 80" | bc -l) )); then
+	if (($(echo "$COVERAGE < 80" | bc -l))); then
 		check_warn "Coverage is ${COVERAGE}% (below 80% target)"
 	else
 		check_pass "Coverage is ${COVERAGE}% (meets 80% target)"

src/runner/tests.rs

@@ -1,7 +1,10 @@
 //! Unit tests for runner module
 
+use std::collections::HashMap;
+use std::hash::Hasher;
+
 use crate::error::DagError;
-use crate::runner::DagRunner;
+use crate::runner::{DagRunner, PassThroughHasher};
 use crate::types::TaskHandle;
 
 // Initialize tracing subscriber for tests (idempotent)
@@ -240,3 +243,16 @@ async fn test_task_panic_in_multi_task_layer() {
     // The run should fail due to the panic
     assert!(result.is_err());
 }
+
+#[test]
+fn test_passthrough_hasher() {
+    let mut passthrough_hashmap = HashMap::with_hasher(PassThroughHasher::default());
+    passthrough_hashmap.insert(64u32, "test string");
+}
+
+#[test]
+#[should_panic]
+fn test_passthrough_hasher_only_u32() {
+    let mut passthrough_hasher = PassThroughHasher::default();
+    passthrough_hasher.write(&[0; 4]);
+}

src/task/tests.rs

@@ -33,3 +33,9 @@ async fn test_custom_task_implementation() {
     // Can't call run again since task was consumed
     // This demonstrates the ownership model
 }
+
+#[test]
+fn test_empty_task_input() {
+    let empty = TaskInput::empty();
+    assert_eq!(empty.inputs.len(), 0);
+}

tarpaulin.toml

@@ -0,0 +1,13 @@
+
+[test_config]
+manifest-path = "./Cargo.toml"
+skip-clean = true
+engine = "Llvm"
+# cargo-tarpaulin already reports tracing lines incorrectly when the feature is turned off,
+# and this is exacerbated when building with all-features.
+all-features = false
+run-types = ["Tests"]
+command = "Test"
+locked = true
+frozen = true
+fail-under = 80.0