nh: mock tests, VM tests and other testing infra

.clippy.toml

@@ -0,0 +1,4 @@
+avoid-breaking-exported-api = false
+allowed-idents-below-min-chars = ["x", "y", "z", "r", "g", "b", "c", "s"]
+absolute-paths-allowed-crates = ["cstree"]
+allowed-wildcard-imports = ["super", "Kind"]

.github/workflows/check.yaml

@@ -0,0 +1,22 @@
+name: "Check Flake"
+
+on:
+  pull_request:
+  push:
+    branches-ignore:
+      - "update-*"
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: cachix/install-nix-action@master
+        with:
+          github_access_token: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: actions/checkout@v4
+
+      - run: nix flake check
+        name: Test Flake Outputs

.gitignore

@@ -2,3 +2,4 @@
 result*
 target
 report*
+proptest-regressions

.rustfmt.toml

@@ -0,0 +1,27 @@
+group_imports = "StdExternalCrate"
+edition = "2024"                   # keep this in sync with Cargo.toml
+condense_wildcard_suffixes = true
+doc_comment_code_block_width = 100
+enum_discrim_align_threshold = 60
+force_explicit_abi = false
+force_multiline_blocks = true
+format_code_in_doc_comments = true
+format_macro_matchers = true
+format_strings = true
+hard_tabs = false
+indent_style = "Block"
+hex_literal_case = "Upper"
+imports_granularity = "Crate"
+imports_layout = "Vertical"
+inline_attribute_width = 60
+match_block_trailing_comma = true
+max_width = 110
+newline_style = "Unix"
+normalize_comments = true
+normalize_doc_attributes = true
+overflow_delimited_expr = true
+struct_field_align_threshold = 60
+unstable_features = true
+use_field_init_shorthand = true
+use_try_shorthand = true
+wrap_comments = true