test(strs_tools): Finalize split test coverage and workspace verification

Author: Wandalen

module/core/strs_tools/-plan.md

@@ -10,8 +10,8 @@
 *   Ultimately, ensure all tests within `module/core/strs_tools/tests/inc/split_test/` pass, and subsequently, all tests for the `strs_tools` crate pass.
 
 ### Progress
-*   Overall progress summary: ✅ Increment 1-3.2 Complete, ✅ Increment 4 Complete (No action needed). ⏳ Planning for Increment 5.
-*   Key Milestones Achieved: ✅ Initial Plan Approved, ✅ Increment 1, ✅ Increment 2, ✅ Increment 3.1, ✅ Increment 3.2 Test Expectations Updated & Re-baselined.
+*   Overall progress summary: ✅ All Increments Complete.
+*   Key Milestones Achieved: ✅ Initial Plan Approved, ✅ Increment 1, ✅ Increment 2, ✅ Increment 3.1, ✅ Increment 3.2, ✅ Increment 4, ✅ Increment 5.
 
 ### Relevant Context
 *   **Primary Language(s):** Rust
@@ -47,66 +47,26 @@
     *   (Details as before)
     *   Commit Message: `feat(strs_tools): Default preserving_delimeters to true in SplitOptionsFormer`
 *   ✅ Increment 3.2: Update Test Expectations for New Default and Re-baseline Failures
-    *   Target Component(s): All test files in `module/core/strs_tools/tests/inc/split_test/`.
-        *   `basic_split_tests.rs`
-        *   `preserving_options_tests.rs`
-        *   `stripping_options_tests.rs`
-        *   `quoting_options_tests.rs`
-        *   `combined_options_tests.rs`
-        *   `edge_case_tests.rs`
-        *   `indexing_options_tests.rs`
-    *   Pre-Analysis: `preserving_delimeters` now defaults to `true` in `SplitOptionsFormer::new()`. Many existing test assertions (both those that were passing with the old default and those that were failing) might now be incorrect if they relied on the implicit `preserving_delimeters: false`.
-    *   Detailed Plan Steps:
-        1.  **Systematically Review and Update `basic_split_tests.rs`:** (Completed)
-        2.  **Systematically Review and Update `preserving_options_tests.rs`:** (Completed)
-        3.  **Systematically Review and Update `stripping_options_tests.rs`:** (Completed)
-        4.  **Systematically Review and Update `quoting_options_tests.rs`:** (Completed)
-        5.  **Systematically Review and Update `combined_options_tests.rs`:** (Completed)
-        6.  **Systematically Review and Update `edge_case_tests.rs`:** (Completed)
-        7.  **Systematically Review and Update `indexing_options_tests.rs`:** (Completed)
-        8.  **Initial Full Test Run & Analysis:** (Completed - All tests passed)
-        9.  **Identify and Comment Out Failures:** (Completed - No new failures)
-        10. **Update Plan File with Failing Tests:** (Completed - No new failing tests to list)
-    *   Crucial Design Rules: Critical Log Analysis, Minimal necessary change (to test expectations).
-    *   Relevant Behavior Rules: Adherence to the new default for `preserving_delimeters`.
-    *   Verification Strategy:
-        1.  User reviews a sample of updated test expectations during the modification phase. (Completed implicitly)
-        2.  User provides the full test output from Detailed Plan Step 8. (Completed - All tests passed)
-        3.  After commenting out newly failing tests (Detailed Plan Step 9), request the user to run the tests again. (Completed - No tests needed commenting)
-        4.  User reviews the updated list of failing tests in the plan file. (Completed - List is empty)
+    *   (Details as before)
     *   Commit Message: "test(strs_tools): Update expectations for new default preserving_delimeters=true, re-baseline failures"
 *   ✅ Increment 4: Systematically Re-enable and Fix Failing/Commented Tests (Iterative)
-    *   Target Component(s): `strs_tools` (source and/or test code)
-    *   Pre-Analysis: List of commented-out tests from Increment 3.2 is empty.
-    *   Detailed Plan Steps: No action needed as all tests in `inc::split_test` passed after Increment 3.2.
+    *   (Details as before)
     *   Commit Message: N/A (No changes made in this increment)
-*   ⏳ Increment 5: Final Test Suite Review, Add Missing Coverage, and Workspace Verification
+*   ✅ Increment 5: Final Test Suite Review, Add Missing Coverage, and Workspace Verification
     *   Target Component(s): `strs_tools` crate, especially `tests/inc/split_test/` and `src/string/split.rs`.
     *   Pre-Analysis: All tests in `inc::split_test` are currently passing with the new default for `preserving_delimeters`. The Test Matrix drafted in Increment 1 needs to be reviewed against the current test suite.
     *   Detailed Plan Steps:
-        1.  **Review Test Matrix vs. Current Tests:** (In Progress - Test Matrix ID comments added to all files in `inc::split_test`)
-            *   Load the Test Matrix from Increment 1 (or its latest version if it was updated).
-            *   For each combination in the Test Matrix:
-                *   Verify if a corresponding test exists in `tests/inc/split_test/`.
-                *   Ensure the test name clearly reflects the matrix combination it covers.
-                *   Ensure the test logic correctly implements the options and checks the expected outcome as per the matrix and the new `preserving_delimeters: true` default.
-                *   Ensure `// Test Matrix ID: [Matrix_Row_ID]` comment is present and correct.
-        2.  **Identify Coverage Gaps:**
-            *   List any Test Matrix combinations that do not have a corresponding test or where the existing test is insufficient.
-        3.  **Implement Missing Tests (if any):**
-            *   For each identified gap, create a new test function in the appropriate test file.
-            *   Name the test clearly, referencing the Test Matrix ID.
-            *   Implement the test logic according to the matrix specification.
-        4.  **Code Review (Self-Critique):**
-            *   Review `src/string/split.rs` for any obvious logical flaws, unhandled edge cases not covered by the matrix, or areas where clarity could be improved (e.g., comments, variable names).
-            *   Review all test files in `tests/inc/split_test/` for clarity, correctness, and adherence to the Test Matrix.
-        5.  **Run All `strs_tools` Tests:** Request user to run `cargo test -p strs_tools --features string_split --all-targets`.
-        6.  **Analyze Results:** If any tests fail, apply Critical Log Analysis and propose fixes (this would likely mean iterating on this increment or adding a sub-increment).
+        1.  **Review Test Matrix vs. Current Tests:** (Completed - Test Matrix ID comments added/verified)
+        2.  **Identify Coverage Gaps:** (Completed - No gaps identified based on current matrix)
+        3.  **Implement Missing Tests (if any):** (Completed - No missing tests identified)
+        4.  **Code Review (Self-Critique):** (Completed)
+        5.  **Run All `strs_tools` Tests:** (Completed - All tests passed)
+        6.  **Analyze Results:** (Completed - All tests passed)
     *   Crucial Design Rules: Testing: Plan with a Test Matrix When Writing Tests.
     *   Relevant Behavior Rules: All relevant behavior rules for `split`.
     *   Verification Strategy:
-        *   User confirms all Test Matrix rows are covered by a test with a corresponding ID comment.
-        *   User provides output of `cargo test -p strs_tools --features string_split --all-targets`. All tests must pass.
+        *   User confirms all Test Matrix rows are covered by a test with a corresponding ID comment. (Confirmed)
+        *   User provides output of `cargo test -p strs_tools --features string_split --all-targets`. All tests must pass. (Confirmed)
     *   Commit Message: "test(strs_tools): Finalize split test coverage and workspace verification"
 
 ### Task Requirements