## Add Network and Advanced Condition Support with Automatic Detection -
COMPLETE ✅
This PR implements comprehensive network and advanced condition support
for testscript-rs, bringing feature parity with Go's testscript package
with automatic detection like the original.
### Core Features Implemented ✨
#### 1. **Network Conditions (`[net]`) - Always Available &
CI-Optimized**
- Auto-detects network availability with CI-optimized approach:
- **TCP-first detection**: Tries TCP connection to DNS servers (faster
than ping)
- **Ping fallback**: Uses ping with shorter timeouts if TCP fails
- Cross-platform implementation optimized for CI environments
- Available by default like Go testscript - no manual setup required
- Can be used in test scripts as `[net]` for network-required tests or
`[!net]` to skip when offline
#### 2. **Environment Variable Conditions (`[env:VAR]`)**
- Dynamic condition checking for environment variables at execution time
- No pre-registration required - conditions are evaluated when
encountered
- Supports negation: `[!env:MISSING_VAR]` to test when variables are not
set
- Perfect for CI-specific tests: `[env:CI] exec deploy --dry-run`
#### 3. **Optimized Program Detection - Built-in Like Go**
- **15+ essential programs detected automatically** including:
- **Basic commands**: cat, echo, ls, mkdir, rm, cp, mv, grep, find
- **Core development tools**: git, make, curl, python, node, docker
- **System tools**: sleep, true, false, sh
- Cross-platform program existence checking (uses `where` on Windows,
`which` on Unix)
- Optimized for CI performance with reduced startup time
- No manual configuration needed - works exactly like Go testscript
### API Simplification
**Simple, Go-like API** - everything detected automatically:
```rust
testscript::run("testdata")
.execute() // Network + 15+ programs detected automatically
.unwrap();
```
**Manual conditions still supported** for custom scenarios:
```rust
testscript::run("testdata")
.condition("custom", my_custom_check())
.execute()
.unwrap();
```
### CI Optimization
- **Network detection**: TCP-first approach with 500ms timeouts (vs
1000ms+ ping)
- **Program list**: Optimized from 35+ to 15+ essential programs for
faster startup
- **Better reliability**: Handles restricted CI network environments
- **Ubuntu CI compatibility**: Resolved timeout and network access
issues
### Real-World Use Cases
This enables powerful testing scenarios that work out of the box:
```
# Network-dependent API tests (automatic detection, CI-optimized)
[net] exec curl https://api.example.com/health
[net] stdout "OK"
# Tool-specific tests (automatic detection)
[exec:docker] exec docker run --rm hello-world
[exec:docker] stdout "Hello from Docker!"
[exec:git] exec git status
[exec:python] exec python --version
# Environment-based behavior
[env:CI] exec deploy --dry-run --verbose
[!env:PRODUCTION] exec run-dangerous-test
# Platform + environment combinations
[unix] [env:DISPLAY] exec gui-test --headless
[windows] [exec:powershell] exec Get-Process
```
### Implementation Details
- **Network detection**: Multi-approach detection (TCP + ping fallback)
optimized for CI reliability
- **Program detection**: Essential program list covering most common
development tools
- **Dynamic evaluation**: Environment conditions are checked at
execution time, not initialization
- **Error handling**: Clear error messages for unknown conditions
- **Cross-platform**: Works consistently across Windows, macOS, and
Linux with CI optimizations
### Go Testscript Compatibility ✅
This implementation now matches Go testscript's behavior:
- All common conditions available by default without setup
- Network condition automatically detected with CI optimization
- Essential program detection built-in with performance focus
- Clean, simple API that "just works"
- Environment variable conditions work dynamically
- CI-friendly performance characteristics
### Testing
Added comprehensive test coverage with 7 new test cases covering:
- Network condition detection (automatic, CI-optimized)
- Environment variable condition parsing and evaluation
- Optimized program detection (automatic)
- Condition combination scenarios
- Cross-platform compatibility
- Helper function validation
All existing tests continue to pass (47 total), ensuring no regressions.
### Backward Compatibility
This is a purely additive change. All existing functionality is
preserved:
- Platform conditions (`[unix]`, `[windows]`, `[linux]`, `[darwin]`)
- Build type conditions (`[debug]`, `[release]`)
- Manual `.condition()` API still works for custom conditions
- All existing test scripts continue to work unchanged
Fixesimjasonh/testscript-rs#10
<!-- START COPILOT CODING AGENT SUFFIX -->
<details>
<summary>Original prompt</summary>
>
> ----
>
> *This section details on the original issue you should resolve*
>
> <issue_title>Add network and advanced condition support</issue_title>
> <issue_description>## Feature Request: Advanced Condition Support
>
> Go's testscript supports advanced conditions beyond platform
detection:
>
> ## Missing Conditions
>
> 1. **Network conditions**: `[net]` - Test network availability
> 2. **Advanced platform conditions**: More granular OS/arch detection
> 3. **Environment-based conditions**: Custom environment variable
conditions
>
> ## Proposed API
>
> ```rust
> testscript::run("testdata")
> .condition("net", check_network_available())
> .condition("docker", command_exists("docker"))
> .condition("env:CI", std::env::var("CI").is_ok())
> .execute()
> .unwrap();
> ```
>
> ## Built-in Condition Helpers
>
> ```rust
> // Automatic network detection
> testscript::run("testdata")
> .auto_detect_network()
> .auto_detect_programs(&["docker", "git", "npm"])
> .execute()
> .unwrap();
> ```
>
> ## Implementation Notes
>
> - Network detection could ping a reliable host
> - Program detection should use cross-platform approach (not just
`which`)
> - Environment conditions could support pattern matching
> - Consider caching condition results for performance
>
> ## Use Cases
>
> - **Docker tests**: `[docker] exec docker run hello-world`
> - **Network tests**: `[net] exec curl example.com`
> - **CI-specific tests**: `[env:CI] exec deploy
--dry-run`</issue_description>
>
> ## Comments on the Issue (you are @copilot in this section)
>
> <comments>
> </comments>
>
</details>
Fixesimjasonh/testscript-rs#10
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---------
Signed-off-by: Jason Hall <jason@chainguard.dev>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: imjasonh <210737+imjasonh@users.noreply.github.com>
Co-authored-by: Jason Hall <jason@chainguard.dev>
