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Implements local Python SDK replacement functionality for testing Pulumi providers and programs with unpublished Python SDK builds. This feature enables developers to test against local Python SDKs using pip install -e (editable mode), following the same pattern as existing YarnLink (Node.js) and GoModReplacement (Go) features.
1. **pulumitest/opttest/opttest.go**: - Added `PythonLinks []string` field to `Options` struct to store local Python package paths - Created `PythonLink()` function to accept one or more local Python package paths - Updated `Defaults()` function to initialize `PythonLinks` slice 2. **pulumitest/newStack.go**: - Implemented pip install logic to execute `python -m pip install -e <path>` for each Python package - Uses absolute paths (consistent with GoModReplacement pattern) - Executes after YarnLink and before GoModReplacement for logical ordering - Includes proper error handling and logging 3. **pulumitest/opttest/opttest_test.go** (new file): - `TestPythonLinkOption`: Verifies single package path is appended - `TestPythonLinkMultiplePackages`: Verifies multiple package paths can be specified - `TestPythonLinkAccumulates`: Verifies packages accumulate across multiple calls - `TestDefaultsResetsPythonLinks`: Verifies Defaults() resets PythonLinks 4. **pulumitest/README.md**: - Added "Python - Local Package Installation" section - Documented PythonLink usage with examples - Followed same documentation pattern as YarnLink and GoModReplacement sections - **Editable Mode**: Uses `pip install -e` for symlinked/editable installation (same behavior as yarn link) - **Multiple Packages**: Supports installing multiple local Python packages in a single test - **Absolute Paths**: Converts relative paths to absolute paths for reliability - **Error Handling**: Clear error messages if pip install fails or paths don't exist - **Environment Aware**: Uses `python -m pip` for better virtual environment compatibility - ✅ All unit tests for PythonLink option pass (4/4 tests) - ✅ Code formatting passes (go fmt) - ✅ Code vetting passes (go vet) - ✅ Linting passes - ✅ Implementation follows existing architectural patterns for YarnLink and GoModReplacement ```go import ( "filepath" "testing" "github.com/pulumi/providertest/pulumitest" "github.com/pulumi/providertest/pulumitest/opttest" ) func TestWithLocalPythonSDK(t *testing.T) { // Use local Python SDK build test := pulumitest.NewPulumiTest(t, "test_dir", opttest.PythonLink("../sdk/python")) // Or multiple packages test2 := pulumitest.NewPulumiTest(t, "test_dir", opttest.PythonLink("../sdk/python", "../other-sdk/python")) test.Up(t) } ```
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CONTRIBUTING.md

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@@ -29,7 +29,7 @@ The `pulumitest` module is the core testing library for Pulumi programs and prov
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**Options System** (`opttest/opttest.go`)
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- Functional options pattern via `opttest.Option` interface
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- Key options: `AttachProvider`, `AttachProviderServer`, `AttachProviderBinary`, `TestInPlace`, `SkipInstall`, `SkipStackCreate`, `YarnLink`, `GoModReplacement`, `DotNetReference`, `LocalProviderPath`
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- Key options: `AttachProvider`, `AttachProviderServer`, `AttachProviderBinary`, `TestInPlace`, `SkipInstall`, `SkipStackCreate`, `YarnLink`, `PythonLink`, `GoModReplacement`, `DotNetReference`, `LocalProviderPath`
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- Options are deeply copied to allow independent modification when using `CopyToTempDir()`
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- Default passphrase: "correct horse battery staple" for deterministic encryption
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@@ -152,3 +152,31 @@ The library supports multiple ways to configure providers for testing:
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- `pulumi install` fails: Check .csproj package versions are available on NuGet
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- Build fails with missing types: Verify all project references are correctly added
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- Stack creation hangs: Check for `PULUMI_AUTOMATION_API_SKIP_VERSION_CHECK=true` in CI environments
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### Python Issues
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**PythonLink Path Resolution**
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- Relative paths in `PythonLink()` are converted to absolute paths automatically
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- Use paths relative to the test working directory
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- The test framework resolves paths before passing to `pip install -e`
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**Python Environment Detection**
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- The library prefers `python3` command, then falls back to `python`
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- Uses `python3 -m pip install -e <path>` for installation
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- Ensure the Python interpreter used matches the one configured in your Pulumi program
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**Package Not Found After PythonLink**
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- Error: Pulumi program fails with `ModuleNotFoundError` despite `PythonLink()`
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- Solution: Verify the test Python environment matches the Pulumi program's Python environment
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- Check installed packages: `python3 -m pip list | grep <package-name>`
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- Ensure virtual environment is activated before running tests if your program uses one
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**Editable Install Issues**
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- Error: `error: invalid command 'develop'` or setup.py errors
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- Solution: Ensure the package directory has a valid `setup.py` or `pyproject.toml`
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- `PythonLink()` expects a package directory, not a Python file
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**Common Test Failures**
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- `pulumi install` fails: Unrelated to `PythonLink`; check `requirements.txt` in your Pulumi program
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- Import errors with local SDK: The editable install creates symlinks; ensure no version conflicts
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- Test passes but program fails: Python environments differ between test and Pulumi execution

pulumitest/README.md

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@@ -159,6 +159,23 @@ test := NewPulumiTest(t,
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)
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```
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### Python - Local Package Installation
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For Python, we support installing local packages in editable mode via `pip install -e`. This allows using a local build of the Python SDK during testing. Before running your test, ensure your Python environment is properly configured (typically within a virtual environment).
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The local package installation can be specified using the `PythonLink` test option:
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```go
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NewPulumiTest(t, "test_dir", opttest.PythonLink("../sdk/python"))
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```
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Multiple packages can be specified:
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```go
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NewPulumiTest(t, "test_dir",
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opttest.PythonLink("../sdk/python", "../other-sdk/python"))
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```
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## Additional Operations
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### Update Source

pulumitest/newStack.go

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@@ -148,6 +148,29 @@ func (pt *PulumiTest) NewStack(t PT, stackName string, opts ...optnewstack.NewSt
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}
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}
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if options.PythonLinks != nil && len(options.PythonLinks) > 0 {
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// Determine which Python interpreter to use. Try python3 first for better
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// compatibility with modern systems, then fall back to python.
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pythonCmd := "python"
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if _, err := exec.LookPath("python3"); err == nil {
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pythonCmd = "python3"
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}
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for _, pkgPath := range options.PythonLinks {
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absPath, err := filepath.Abs(pkgPath)
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if err != nil {
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ptFatalF(t, "failed to get absolute path for %s: %s", pkgPath, err)
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}
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cmd := exec.Command(pythonCmd, "-m", "pip", "install", "-e", absPath)
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cmd.Dir = pt.workingDir
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ptLogF(t, "installing python package: %s", cmd)
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out, err := cmd.CombinedOutput()
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if err != nil {
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ptFatalF(t, "failed to install python package %s: %s\n%s", pkgPath, err, out)
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}
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}
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}
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if options.GoModReplacements != nil && len(options.GoModReplacements) > 0 {
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orderedReplacements := make([]string, 0, len(options.GoModReplacements))
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for old := range options.GoModReplacements {

pulumitest/opttest/opttest.go

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@@ -105,6 +105,14 @@ func YarnLink(packages ...string) Option {
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})
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}
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// PythonLink specifies packages which should be installed from a local path via `pip install -e` (editable mode).
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// Each package path is installed with `pip install -e <path>` on stack creation.
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func PythonLink(packagePaths ...string) Option {
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return optionFunc(func(o *Options) {
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o.PythonLinks = append(o.PythonLinks, packagePaths...)
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})
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}
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// GoModReplacement specifies replacements to be add to the go.mod file when running the program under test.
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// Each replacement is added to the go.mod file with `go mod edit -replace <replacement>` on stack creation.
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func GoModReplacement(packageSpecifier string, replacementPathElem ...string) Option {
@@ -175,6 +183,7 @@ type Options struct {
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Providers map[providers.ProviderName]ProviderConfigUnion
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UseAmbientBackend bool
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YarnLinks []string
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PythonLinks []string
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GoModReplacements map[string]string
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DotNetReferences map[string]string
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CustomEnv map[string]string
@@ -210,6 +219,7 @@ func Defaults() Option {
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o.Providers = make(map[providers.ProviderName]ProviderConfigUnion)
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o.UseAmbientBackend = false
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o.YarnLinks = []string{}
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o.PythonLinks = []string{}
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o.GoModReplacements = make(map[string]string)
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o.DotNetReferences = make(map[string]string)
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o.CustomEnv = make(map[string]string)

pulumitest/opttest/opttest_test.go

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package opttest_test
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import (
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"path/filepath"
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"testing"
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"github.com/pulumi/providertest/pulumitest/opttest"
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"github.com/stretchr/testify/assert"
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)
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func TestPythonLinkOption(t *testing.T) {
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t.Parallel()
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opts := opttest.DefaultOptions()
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assert.Empty(t, opts.PythonLinks, "expected PythonLinks to be empty by default")
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pythonLink := opttest.PythonLink("path/to/sdk")
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pythonLink.Apply(opts)
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assert.Equal(t, []string{"path/to/sdk"}, opts.PythonLinks, "expected PythonLink to append path")
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}
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func TestPythonLinkMultiplePackages(t *testing.T) {
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t.Parallel()
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opts := opttest.DefaultOptions()
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pythonLink := opttest.PythonLink("path/to/sdk1", "path/to/sdk2")
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pythonLink.Apply(opts)
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assert.Equal(t, []string{"path/to/sdk1", "path/to/sdk2"}, opts.PythonLinks,
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"expected PythonLink to append multiple paths")
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}
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func TestPythonLinkAccumulates(t *testing.T) {
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t.Parallel()
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opts := opttest.DefaultOptions()
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pythonLink1 := opttest.PythonLink("path/to/sdk1")
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pythonLink1.Apply(opts)
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pythonLink2 := opttest.PythonLink("path/to/sdk2")
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pythonLink2.Apply(opts)
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assert.Equal(t, []string{"path/to/sdk1", "path/to/sdk2"}, opts.PythonLinks,
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"expected PythonLinks to accumulate across multiple calls")
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}
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func TestDefaultsResetsPythonLinks(t *testing.T) {
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t.Parallel()
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opts := opttest.DefaultOptions()
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pythonLink := opttest.PythonLink("path/to/sdk")
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pythonLink.Apply(opts)
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assert.NotEmpty(t, opts.PythonLinks, "expected PythonLinks to be populated")
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defaults := opttest.Defaults()
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defaults.Apply(opts)
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assert.Empty(t, opts.PythonLinks, "expected Defaults to reset PythonLinks")
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}
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func TestPythonLinkIntegrationV1(t *testing.T) {
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t.Parallel()
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// Integration test: verify PythonLink can be used with a real test package (v1)
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// This test checks that the option correctly processes package paths
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pkgV1Path := filepath.Join("..", "testdata", "python_pkg_v1")
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// Verify the test package directory exists
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_, err := filepath.Abs(pkgV1Path)
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assert.NoError(t, err, "expected to resolve package path v1")
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// Create test with PythonLink pointing to v1 package
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opts := opttest.DefaultOptions()
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pythonLink := opttest.PythonLink(pkgV1Path)
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pythonLink.Apply(opts)
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// Verify the path was correctly added to options
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assert.Equal(t, 1, len(opts.PythonLinks), "expected one Python package path")
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assert.True(t, len(opts.PythonLinks[0]) > 0, "expected non-empty package path")
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}
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func TestPythonLinkIntegrationV2(t *testing.T) {
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t.Parallel()
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// Integration test: verify PythonLink can be used with a real test package (v2)
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pkgV2Path := filepath.Join("..", "testdata", "python_pkg_v2")
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// Verify the test package directory exists
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_, err := filepath.Abs(pkgV2Path)
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assert.NoError(t, err, "expected to resolve package path v2")
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// Create test with PythonLink pointing to v2 package
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opts := opttest.DefaultOptions()
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pythonLink := opttest.PythonLink(pkgV2Path)
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pythonLink.Apply(opts)
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// Verify the path was correctly added to options
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assert.Equal(t, 1, len(opts.PythonLinks), "expected one Python package path")
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assert.True(t, len(opts.PythonLinks[0]) > 0, "expected non-empty package path")
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}
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func TestPythonLinkUpgradePathGeneration(t *testing.T) {
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t.Parallel()
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// Integration test: verify PythonLink generates correct paths for version upgrades
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pkgV1Path := filepath.Join("..", "testdata", "python_pkg_v1")
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pkgV2Path := filepath.Join("..", "testdata", "python_pkg_v2")
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opts := opttest.DefaultOptions()
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// Add v1 package
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pythonLinkV1 := opttest.PythonLink(pkgV1Path)
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pythonLinkV1.Apply(opts)
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assert.Equal(t, 1, len(opts.PythonLinks), "expected one path after v1")
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// Add v2 package (simulating version upgrade)
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pythonLinkV2 := opttest.PythonLink(pkgV2Path)
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pythonLinkV2.Apply(opts)
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assert.Equal(t, 2, len(opts.PythonLinks), "expected two paths after adding v2")
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// Verify both paths are present
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assert.Contains(t, opts.PythonLinks, pkgV1Path, "expected v1 path to be present")
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assert.Contains(t, opts.PythonLinks, pkgV2Path, "expected v2 path to be present")
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}
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"""Test package for PythonLink integration tests."""
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__version__ = "0.0.1"
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def get_version():
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"""Return the package version."""
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return __version__
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def get_message():
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"""Return a version-specific message."""
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return f"pulumi-test-pkg version {__version__}"
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from setuptools import setup, find_packages
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setup(
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name="pulumi-test-pkg",
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version="0.0.1",
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packages=find_packages(),
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description="Test package for PythonLink integration tests",
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)
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"""Test package for PythonLink integration tests."""
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__version__ = "0.0.2"
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def get_version():
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"""Return the package version."""
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return __version__
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def get_message():
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"""Return a version-specific message."""
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return f"pulumi-test-pkg version {__version__}"
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from setuptools import setup, find_packages
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setup(
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name="pulumi-test-pkg",
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version="0.0.2",
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packages=find_packages(),
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description="Test package for PythonLink integration tests",
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)
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name: python-with-local-pkg
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runtime: python
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description: Test program for PythonLink integration tests

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