Int tests (#685)

* Here's a commit message for this change:

refactor: Move mint tests to fake_wallet.rs and add descriptive comments

refactor: pure wallet/mint does not need arc

refactor: Consolidate NUT-06 test into single function and remove redundant module

docs: Add comments explaining test purposes in integration tests file

refactor: Remove anyhow and replace with expect for error handling

refactor: use expect in pure tests

feat: Add configurable database type via environment variable for test mint and wallet

refactor: Update database initialization in test mint and wallet creation

feat: Add temporary directory support for redb and sqlite databases in tests

feat: Add database type argument to test commands in justfile

ci: Add build matrix for pure-itest with memory, sqlite, and redb databases

refactor: use expect in pure tests

refactor: Move and refactor `test_swap_unbalanced` from mint to integration tests pure

refactor: move mint tests to pure tests

docs: Add detailed comments explaining test file purposes for mint and integration tests

refactor: Extract keyset ID retrieval into a reusable function

test: Add concurrent double-spend test with 3 swap transactions

refactor: Simplify concurrent swap request processing and error handling

test: Add check to verify all proofs are marked as spent in concurrent double-spend test

refactor: Optimize proof state retrieval in concurrent double-spend test

feat: Add test for concurrent melt race condition with same proofs

fix: Update concurrent melt test to use melt quote and handle errors

refactor: melt concurrrent

refactor: Rename test function for clarity in concurrent double-spend scenario

refactor: Modify test_concurrent_double_spend_melt to manually create melt requests in mint tasks

feat: con melt test

refactor: Optimize proof state handling and error recovery in check_spendable

refactor: Extract helper method to reset proofs to original state

fix: reset y states

fix: reset y states

* fix: acces of priv feilds

* fix: add extra migrate

.github/workflows/ci.yml

@@ -223,6 +223,14 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 15
     needs: [pre-commit-checks, clippy]
+    strategy:
+      matrix:
+        database: 
+          [
+          memory,
+          sqlite,
+          redb
+          ]
     steps:
       - name: checkout
         uses: actions/checkout@v4
@@ -233,6 +241,8 @@ jobs:
       - name: Rust Cache
         uses: Swatinem/rust-cache@v2
       - name: Test fake mint
+        run: nix develop -i -L .#stable --command just test-pure ${{ matrix.database }}
+      - name: Test mint
         run: nix develop -i -L .#stable --command just test