provider-test-patterns

Files (4)

• SKILL.md
• checks.md · references/
• ephemeral.md · references/
• sweepers.md · references/

SKILL.md (first lines)

# Provider Acceptance Test Patterns

Patterns for writing acceptance tests using
[terraform-plugin-testing](https://github.com/hashicorp/terraform-plugin-testing)
with the [Plugin Framework](https://github.com/hashicorp/terraform-plugin-framework).

Source: [HashiCorp Testing Patterns](https://developer.hashicorp.com/terraform/plugin/testing/testing-patterns)

**References** (load when needed):
- `references/checks.md` — statecheck, plancheck, knownvalue types, tfjsonpath, comparers
- `references/sweepers.md` — sweeper setup, TestMain, dependencies
- `references/ephemeral.md` — ephemeral resource testing, echoprovider, multi-step patterns

---

## Test Lifecycle

The framework runs each TestStep through: **plan → apply → refresh → final
plan**. If the final plan shows a diff, the test fails (unless
`ExpectNonEmptyPlan` is set). After all steps, destroy runs followed by
`CheckDestroy`. This means every test automatically verifies that
configurations apply cleanly and produce no drift — no assertions needed for
that.

---

## Test Function Structure

```go
func TestAccExample_basic(t *testing.T) {
    var widget example.Widget
    rName := acctest.RandStringFromCharSet(10, acctest.CharSetAlphaNum)
    resourceName := "example_widget.test"

    resource.ParallelTest(t, resource.TestCase{
        PreCheck:                 func() { testAccPreCheck(t) },
        ProtoV6ProviderFactories: testAccProtoV6ProviderFactories,
        CheckDestroy:             testAccCheckExampleDestroy,
        Steps: []resource.TestStep{
            {
                Config: testAccExampleConfig_basic(rName),
                ConfigStateChecks: []statecheck.StateCheck{
                    stateCheckExampleExists(resourceName, &widget),
                    statecheck.ExpectKnownValue(resourceName,
                        tfjsonpath.New("name"), knownvalue.StringExact(rName)),
                    statecheck.ExpectKnownValue(resourceName,
                        tfjsonpath.New("id"), knownvalue.NotNull()),
                },
            },
        },
    })
}
```

Use `resource.ParallelTest` by default. Use `resource.Test` only when tests
share state or cannot run concurrently.

---

## Provider Factory

```go
// provider_test.go — Plugin Framework with Protocol 6 (use Protocol5 variant if needed)
var testAccProtoV6ProviderFactories = map[string]func() (tfprotov6.ProviderServer, error){
    "example": providerserver.NewProtocol6WithError(New("test")()),
}
```

---

## TestCase Fields

| Field | Purpose |
|-------|---------|
| `PreCheck` | `func()` — verify prerequisites (env vars, API access) |
| `ProtoV6ProviderFactories` | Plugin Framework provider factories |
| `CheckDestroy` | `TestCheckFunc` — verify resources destroyed after all steps |
| `Steps` | `[]TestStep` — sequential test operations |
| `TerraformVersionChecks` | `[]tfversion.TerraformVersionCheck` — gate by CLI version |

---

## TestStep Fields

### Config Mode

| Field | Purpose |
|-------|---------|
| `Config` | Inline HCL string to apply |
| `ConfigStateChecks` | `[]statecheck.StateCheck` — modern assertions (preferred) |
| `ConfigPlanChecks` | `resource.ConfigPlanChecks{PreApply: []plancheck.PlanCheck{...}}` |
| `ExpectError` | `*regexp.Regexp` — expect failure matching pattern |
| `ExpectNonEmptyPlan` | `bool` — expect non-empty plan after apply |
| `PlanOnly` | `bool` — plan without applying |
| `Destroy` | `bool` — run destroy step |
| `PreConfig` | `func()` — setup before step |

### Import Mode

| Field | Purpose |
|-------|---------|
| `ImportState` | `true` to enable import mode |
| `ImportStateVerify` | Verify imported state matches prior state |
| `ImportStateVerifyIgnore` | `[]string` — attributes to skip during verify |
| `ImportStateKind` | `resource.ImportBlockWithID` — import block generation |
| `ResourceName` | Resource address to import |
| `ImportStateId` | Override the ID used for import |

---

## Check Functions

### Modern: ConfigStateChecks (preferred)

Type-safe with aggregated error reporting. Compose built-in checks with custom
`statecheck.StateCheck` implementations. See `references/checks.md` for full
knownvalue types, tfjsonpath navigation, and comparers.

```go

From hashicorp/agent-skills, MPL-2.0.

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