Merge #1658: fix(wallet)!: Improve test utilities

b0dc3dd feat(wallet)!: make `seen_at` mandatory for `Wallet::apply_update_at` (志宇)
00c568d revert(wallet)!: rm `Wallet::unbroadcast_transactions` (志宇)
200a16d fix(wallet)!: delete method `insert_tx` (valued mammal)
ab27884 test(wallet): improve usage of test utils (valued mammal)
9bdf4cb chore: fix imports (valued mammal)
28d8061 test(wallet): fix test descriptor getters (valued mammal)
3135e29 test(wallet): add helpers to `test_utils` (valued mammal)
823bb39 feat(wallet): add module `test_utils` (valued mammal)
297bd9a test(wallet): refactor helper `insert_anchor_from_conf` (valued mammal)

Pull request description:

  Follow up to #1643, refactor `insert_anchor_from_conf` to just insert an anchor of type `ConfirmationBlockTime`

  ### Notes to the reviewers

  The PR introduces a public `test_utils` module and "test-utils" cargo feature that exposes common helpers such as `get_funded_wallet`. Credit to #1492 for inspiring that idea. Usage of test utilities is enhanced overall, and tests are less dependent on problematic APIs that may be removed in the future.

  ### Changelog notice

  - `bdk_wallet`: Added "test-utils" feature flag that exposes common helpers for testing and development
  - Removed methods `Wallet::insert_tx`, `Wallet::insert_checkpoint`, `Wallet::unbroadcast_transactions`

  ### Checklists

  #### All Submissions:

  * [x] I've signed all my commits
  * [x] I followed the [contribution guidelines](https://github.com/bitcoindevkit/bdk/blob/master/CONTRIBUTING.md)
  * [x] I ran `cargo fmt` and `cargo clippy` before committing
  * [x] I've added docs for the new feature
  * [x] This pull request breaks the existing API

Top commit has no ACKs.

Tree-SHA512: 561757595c65b4531dbf8b81f44387af6ac60114ecca493693cd975188741b5ff7b75a0dcf1dafc9d5750566baad81c644e7463c3c412a8331ad73de29601016

crates/wallet/Cargo.toml

@@ -35,13 +35,14 @@ all-keys = ["keys-bip39"]
 keys-bip39 = ["bip39"]
 rusqlite = ["bdk_chain/rusqlite"]
 file_store = ["bdk_file_store"]
+test-utils = ["std"]
 
 [dev-dependencies]
 lazy_static = "1.4"
 assert_matches = "1.5.0"
 tempfile = "3"
 bdk_chain = { path = "../chain", features = ["rusqlite"] }
-bdk_wallet = { path = ".", features = ["rusqlite", "file_store"] }
+bdk_wallet = { path = ".", features = ["rusqlite", "file_store", "test-utils"] }
 bdk_file_store = { path = "../file_store" }
 anyhow = "1"
 rand = "^0.8"

crates/wallet/src/lib.rs

@@ -28,6 +28,8 @@ pub extern crate serde_json;
 pub mod descriptor;
 pub mod keys;
 pub mod psbt;
+#[cfg(feature = "test-utils")]
+pub mod test_utils;
 mod types;
 mod wallet;