add code coverage and initial test infrastructure

Author: pthurlow

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+
+      - name: Install cargo-llvm-cov
+        uses: taiki-e/install-action@cargo-llvm-cov
+
+      - name: Run tests with coverage
+        run: cargo llvm-cov --lcov --output-path lcov.info
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          files: lcov.info
+          fail_ci_if_error: false
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

Cargo.lock

@@ -36,11 +36,16 @@ tar = "0.4"
 semver = "1"
 sqlformat = "0.5.0"
 
+[dev-dependencies]
+mockito = "1"
+tempfile = "3"
+
 [package.metadata.release]
 pre-release-hook = ["git", "cliff", "-o", "CHANGELOG.md", "--tag", "{{version}}" ]
 publish = false
 pre-release-replacements = [
   { file = "skills/hotdata-cli/SKILL.md", search = "^version: .+", replace = "version: {{version}}", exactly = 1 },
+  { file = "README.md", search = "version-[0-9.]+-blue", replace = "version-{{version}}-blue", exactly = 1 },
 ]
 
 # The profile that 'dist' will build with

Cargo.toml

@@ -1,5 +1,11 @@
 # hotdata-cli
 
+<p align="center">
+  <img src="https://img.shields.io/badge/version-0.1.8-blue" alt="version">
+  <a href="https://github.com/hotdata-dev/hotdata-cli/actions/workflows/ci.yml"><img src="https://github.com/hotdata-dev/hotdata-cli/actions/workflows/ci.yml/badge.svg" alt="build"></a>
+  <a href="https://codecov.io/gh/hotdata-dev/hotdata-cli"><img src="https://codecov.io/gh/hotdata-dev/hotdata-cli/branch/main/graph/badge.svg" alt="coverage"></a>
+</p>
+
 Command line interface for [Hotdata](https://www.hotdata.dev).
 
 ## Install