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godot-testing

Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#

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Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#

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Godot Testing

This skill covers test-driven development (TDD) for Godot 4.3+ projects using GUT (Godot Unit Testing) and gdUnit4. It includes framework selection, full RED-GREEN-REFACTOR examples, test structure, running tests in CI, and common testing patterns.

Related skills: godot-code-review for review checklists, dependency-injection for test-friendly architecture, export-pipeline for CI/CD test automation.

Framework Selection

Feature	GUT	gdUnit4
Language	GDScript-first, limited C#	GDScript + C# (first-class)
Install	AssetLib or git submodule	AssetLib or git submodule
Editor integration	Built-in GUT panel	Built-in inspector + panel
Mocking	`double()` / `stub()` API	`mock()` / `spy()` API
Scene testing	`add_child_autofree()`	`auto_free()` + scene runner
CI support	`gut_cmdln.gd` CLI script	`gdunit4_runner` CLI script
C# support	Minimal (GDScript wrappers only)	Native C# assertions + lifecycle
Maturity	Established (Godot 3 + 4)	Godot 4 focused, actively updated
Best for	Pure GDScript projects	Mixed GDScript/C# or C#-only

Rule of thumb: Use GUT for GDScript-only projects. Use gdUnit4 for C# projects or when you need first-class C# support and scene runner utilities.

TDD Workflow: RED-GREEN-REFACTOR

The standard Test-Driven Development cycle: write a failing test (RED), write minimal code to pass (GREEN), then refactor without breaking the test. Each step has its own discipline — don't skip RED (you'll write tests that pass trivially), and don't skip REFACTOR (technical debt compounds).

See references/tdd-workflow.md for a worked GDScript + C# example walking through all three steps on a HealthComponent.

Test Directory Structure

res://
├── src/
│   └── components/
│       ├── health_component.gd
│       └── HealthComponent.cs
└── tests/
    ├── unit/
    │   ├── test_health_component.gd      # GUT: test_ prefix required
    │   └── HealthComponentTest.cs        # gdUnit4 C#: [TestSuite] attribute
    ├── integration/
    │   ├── test_player_scene.gd
    │   └── PlayerSceneTest.cs
    └── gut_config.json                   # GUT configuration (optional)

Naming conventions

Framework	GDScript file	C# file	Test method prefix/attribute
GUT	`test_*.gd`	N/A	`func test_*()`
gdUnit4	`test_*.gd`	`*Test.cs`	`func test_*()` / `[TestCase]`

Running Tests

Both frameworks ship a CLI runner. GUT: addons/gut/gut_cmdln.gd invoked via godot --headless --path . -s addons/gut/gut_cmdln.gd. gdUnit4: --add-gdunit-test-runner argument, or via the editor "GdUnit Tests" dock. CI: tag-triggered or PR-triggered GitHub Action that installs Godot, runs the suite, exits non-zero on failure.

See references/running-tests.md for full GUT and gdUnit4 CLI invocations + a copy-pasteable GitHub Actions workflow.

Testing Patterns

Four common patterns: scenes with nodes (instantiate via add_child in before_each, free in after_each), signal testing (assert that emitting works and connect-then-emit fires), mocking/doubling (gdUnit4 Mock<T> or hand-rolled fakes via @export injection), async (await yields, signals, frames in tests).

See references/testing-patterns.md for full code on each pattern (GDScript + C# where applicable).

Common Assertions

GUT assertions

Assertion	Description
`assert_eq(actual, expected)`	Equality
`assert_ne(actual, expected)`	Not equal
`assert_true(value)`	Is truthy
`assert_false(value)`	Is falsy
`assert_null(value)`	Is null
`assert_not_null(value)`	Is not null
`assert_gt(actual, expected)`	Greater than
`assert_lt(actual, expected)`	Less than
`assert_gte(actual, expected)`	Greater than or equal
`assert_lte(actual, expected)`	Less than or equal
`assert_has(collection, item)`	Collection contains item
`assert_does_not_have(collection, item)`	Collection does not contain item
`assert_string_contains(str, sub)`	String contains substring
`assert_almost_eq(actual, expected, margin)`	Float equality within margin
`assert_signal_emitted(obj, signal_name)`	Signal was emitted
`assert_signal_not_emitted(obj, signal_name)`	Signal was not emitted

gdUnit4 assertions (GDScript + C#)

GDScript	C#	Description
`assert_that(val).is_equal(exp)`	`AssertThat(val).IsEqual(exp)`	Equality
`assert_that(val).is_not_equal(exp)`	`AssertThat(val).IsNotEqual(exp)`	Not equal
`assert_that(val).is_true()`	`AssertThat(val).IsTrue()`	Is true
`assert_that(val).is_false()`	`AssertThat(val).IsFalse()`	Is false
`assert_that(val).is_null()`	`AssertThat(val).IsNull()`	Is null
`assert_that(val).is_not_null()`	`AssertThat(val).IsNotNull()`	Is not null
`assert_that(val).is_greater(exp)`	`AssertThat(val).IsGreater(exp)`	Greater than
`assert_that(val).is_less(exp)`	`AssertThat(val).IsLess(exp)`	Less than
`assert_that(val).is_between(min, max)`	`AssertThat(val).IsBetween(min, max)`	In range (inclusive)
`assert_that(arr).contains([a, b])`	`AssertThat(arr).Contains(a, b)`	Array contains elements
`assert_that(str).contains("sub")`	`AssertThat(str).Contains("sub")`	String contains substring
`assert_that(val).is_approximately(exp, margin)`	`AssertThat(val).IsApproximately(exp, margin)`	Float within margin
`assert_signal(mon).is_emitted("name")`	`AssertSignal(mon).IsEmitted("name")`	Signal emitted

What NOT to Test

Avoid testing things that add noise without catching real bugs:

Godot engine internals — do not assert that Node.add_child() works or that @export variables show up in the editor
Private implementation details — test behavior through the public API; if a refactor breaks a test that covers only private state, the test is wrong
Visual/rendering output — pixel-level rendering results are brittle; test the data driving the visuals instead
Timing-sensitive floats without margins — use assert_almost_eq / IsApproximately for physics values
One-liners that wrap a built-in — a property getter that just returns a field needs no test
Every possible invalid input — test the documented contract, not every imaginable misuse

Checklist

Each test file matches the naming convention for the chosen framework (test_*.gd / *Test.cs)
Tests extend the correct base class (GutTest / GdUnit4.GdUnitTestSuite)
Nodes added to the scene tree use add_child_autofree or auto_free — never manual queue_free()
Signals are watched before the action that triggers them
Mocks/doubles are used for external dependencies, not for the unit under test
Each test covers exactly one behavior (one logical assertion per test)
CI workflow runs tests headlessly on every push and PR
Flaky async tests use explicit timeouts, not arbitrary sleep durations
Tests pass before merging (RED is only acceptable while actively implementing)

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File metadata

name: godot-testing
description: Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#

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---
name: godot-testing
description: Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#
---

# Godot Testing

This skill covers test-driven development (TDD) for Godot 4.3+ projects using GUT (Godot Unit Testing) and gdUnit4. It includes framework selection, full RED-GREEN-REFACTOR examples, test structure, running tests in CI, and common testing patterns.

> **Related skills:** **godot-code-review** for review checklists, **dependency-injection** for test-friendly architecture, **export-pipeline** for CI/CD test automation.

## Framework Selection

| Feature               | GUT                              | gdUnit4                           |
|-----------------------|----------------------------------|-----------------------------------|
| Language              | GDScript-first, limited C#       | GDScript + C# (first-class)       |
| Install               | AssetLib or git submodule        | AssetLib or git submodule         |
| Editor integration    | Built-in GUT panel               | Built-in inspector + panel        |
| Mocking               | `double()` / `stub()` API        | `mock()` / `spy()` API            |
| Scene testing         | `add_child_autofree()`           | `auto_free()` + scene runner      |
| CI support            | `gut_cmdln.gd` CLI script        | `gdunit4_runner` CLI script       |
| C# support            | Minimal (GDScript wrappers only) | Native C# assertions + lifecycle  |
| Maturity              | Established (Godot 3 + 4)        | Godot 4 focused, actively updated |
| Best for              | Pure GDScript projects           | Mixed GDScript/C# or C#-only      |

**Rule of thumb:** Use GUT for GDScript-only projects. Use gdUnit4 for C# projects or when you need first-class C# support and scene runner utilities.

---

## TDD Workflow: RED-GREEN-REFACTOR

The standard Test-Driven Development cycle: write a failing test (RED), write minimal code to pass (GREEN), then refactor without breaking the test. Each step has its own discipline — don't skip RED (you'll write tests that pass trivially), and don't skip REFACTOR (technical debt compounds).

> See [references/tdd-workflow.md](references/tdd-workflow.md) for a worked GDScript + C# example walking through all three steps on a HealthComponent.

---

## Test Directory Structure

```
res://
├── src/
│   └── components/
│       ├── health_component.gd
│       └── HealthComponent.cs
└── tests/
    ├── unit/
    │   ├── test_health_component.gd      # GUT: test_ prefix required
    │   └── HealthComponentTest.cs        # gdUnit4 C#: [TestSuite] attribute
    ├── integration/
    │   ├── test_player_scene.gd
    │   └── PlayerSceneTest.cs
    └── gut_config.json                   # GUT configuration (optional)
```

### Naming conventions

| Framework | GDScript file       | C# file              | Test method prefix/attribute |
|-----------|---------------------|----------------------|------------------------------|
| GUT       | `test_*.gd`         | N/A                  | `func test_*()`              |
| gdUnit4   | `test_*.gd`         | `*Test.cs`           | `func test_*()` / `[TestCase]` |

---

## Running Tests

Both frameworks ship a CLI runner. **GUT:** `addons/gut/gut_cmdln.gd` invoked via `godot --headless --path . -s addons/gut/gut_cmdln.gd`. **gdUnit4:** `--add-gdunit-test-runner` argument, or via the editor "GdUnit Tests" dock. CI: tag-triggered or PR-triggered GitHub Action that installs Godot, runs the suite, exits non-zero on failure.

> See [references/running-tests.md](references/running-tests.md) for full GUT and gdUnit4 CLI invocations + a copy-pasteable GitHub Actions workflow.

---

## Testing Patterns

Four common patterns: **scenes with nodes** (instantiate via `add_child` in `before_each`, free in `after_each`), **signal testing** (assert that emitting works and connect-then-emit fires), **mocking/doubling** (gdUnit4 `Mock<T>` or hand-rolled fakes via `@export` injection), **async** (await yields, signals, frames in tests).

> See [references/testing-patterns.md](references/testing-patterns.md) for full code on each pattern (GDScript + C# where applicable).

---

## Common Assertions

### GUT assertions

| Assertion                                    | Description                        |
|----------------------------------------------|------------------------------------|
| `assert_eq(actual, expected)`                | Equality                           |
| `assert_ne(actual, expected)`                | Not equal                          |
| `assert_true(value)`                         | Is truthy                          |
| `assert_false(value)`                        | Is falsy                           |
| `assert_null(value)`                         | Is null                            |
| `assert_not_null(value)`                     | Is not null                        |
| `assert_gt(actual, expected)`                | Greater than                       |
| `assert_lt(actual, expected)`                | Less than                          |
| `assert_gte(actual, expected)`               | Greater than or equal              |
| `assert_lte(actual, expected)`               | Less than or equal                 |
| `assert_has(collection, item)`               | Collection contains item           |
| `assert_does_not_have(collection, item)`     | Collection does not contain item   |
| `assert_string_contains(str, sub)`           | String contains substring          |
| `assert_almost_eq(actual, expected, margin)` | Float equality within margin       |
| `assert_signal_emitted(obj, signal_name)`    | Signal was emitted                 |
| `assert_signal_not_emitted(obj, signal_name)`| Signal was not emitted             |

### gdUnit4 assertions (GDScript + C#)

| GDScript                                           | C#                                              | Description                     |
|----------------------------------------------------|-------------------------------------------------|---------------------------------|
| `assert_that(val).is_equal(exp)`                   | `AssertThat(val).IsEqual(exp)`                  | Equality                        |
| `assert_that(val).is_not_equal(exp)`               | `AssertThat(val).IsNotEqual(exp)`               | Not equal                       |
| `assert_that(val).is_true()`                       | `AssertThat(val).IsTrue()`                      | Is true                         |
| `assert_that(val).is_false()`                      | `AssertThat(val).IsFalse()`                     | Is false                        |
| `assert_that(val).is_null()`                       | `AssertThat(val).IsNull()`                      | Is null                         |
| `assert_that(val).is_not_null()`                   | `AssertThat(val).IsNotNull()`                   | Is not null                     |
| `assert_that(val).is_greater(exp)`                 | `AssertThat(val).IsGreater(exp)`                | Greater than                    |
| `assert_that(val).is_less(exp)`                    | `AssertThat(val).IsLess(exp)`                   | Less than                       |
| `assert_that(val).is_between(min, max)`            | `AssertThat(val).IsBetween(min, max)`           | In range (inclusive)            |
| `assert_that(arr).contains([a, b])`                | `AssertThat(arr).Contains(a, b)`                | Array contains elements         |
| `assert_that(str).contains("sub")`                 | `AssertThat(str).Contains("sub")`               | String contains substring       |
| `assert_that(val).is_approximately(exp, margin)`   | `AssertThat(val).IsApproximately(exp, margin)`  | Float within margin             |
| `assert_signal(mon).is_emitted("name")`            | `AssertSignal(mon).IsEmitted("name")`           | Signal emitted                  |

---

## What NOT to Test

Avoid testing things that add noise without catching real bugs:

- **Godot engine internals** — do not assert that `Node.add_child()` works or that `@export` variables show up in the editor
- **Private implementation details** — test behavior through the public API; if a refactor breaks a test that covers only private state, the test is wrong
- **Visual/rendering output** — pixel-level rendering results are brittle; test the data driving the visuals instead
- **Timing-sensitive floats without margins** — use `assert_almost_eq` / `IsApproximately` for physics values
- **One-liners that wrap a built-in** — a property getter that just returns a field needs no test
- **Every possible invalid input** — test the documented contract, not every imaginable misuse

---

## Checklist

- [ ] Each test file matches the naming convention for the chosen framework (`test_*.gd` / `*Test.cs`)
- [ ] Tests extend the correct base class (`GutTest` / `GdUnit4.GdUnitTestSuite`)
- [ ] Nodes added to the scene tree use `add_child_autofree` or `auto_free` — never manual `queue_free()`
- [ ] Signals are watched before the action that triggers them
- [ ] Mocks/doubles are used for external dependencies, not for the unit under test
- [ ] Each test covers exactly one behavior (one logical assertion per test)
- [ ] CI workflow runs tests headlessly on every push and PR
- [ ] Flaky async tests use explicit timeouts, not arbitrary sleep durations
- [ ] Tests pass before merging (RED is only acceptable while actively implementing)

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Source repository: jame581/GodotPrompter
License: MIT
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Last GitHub push: Sep 20, 2026
Registry updated: Sep 29, 2026
Instruction path: skills/godot-testing/SKILL.md @ 3e8d0f005f96

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godot-testing

Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#

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Price unconfirmed★ 768 GitHub starsRegistry updated · Sep 29, 2026agent-skill

Overview

Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#

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Godot Testing

Related skills: godot-code-review for review checklists, dependency-injection for test-friendly architecture, export-pipeline for CI/CD test automation.

Framework Selection

Feature	GUT	gdUnit4
Language	GDScript-first, limited C#	GDScript + C# (first-class)
Install	AssetLib or git submodule	AssetLib or git submodule
Editor integration	Built-in GUT panel	Built-in inspector + panel
Mocking	`double()` / `stub()` API	`mock()` / `spy()` API
Scene testing	`add_child_autofree()`	`auto_free()` + scene runner
CI support	`gut_cmdln.gd` CLI script	`gdunit4_runner` CLI script
C# support	Minimal (GDScript wrappers only)	Native C# assertions + lifecycle
Maturity	Established (Godot 3 + 4)	Godot 4 focused, actively updated
Best for	Pure GDScript projects	Mixed GDScript/C# or C#-only

Rule of thumb: Use GUT for GDScript-only projects. Use gdUnit4 for C# projects or when you need first-class C# support and scene runner utilities.

TDD Workflow: RED-GREEN-REFACTOR

See references/tdd-workflow.md for a worked GDScript + C# example walking through all three steps on a HealthComponent.

Test Directory Structure

res://
├── src/
│   └── components/
│       ├── health_component.gd
│       └── HealthComponent.cs
└── tests/
    ├── unit/
    │   ├── test_health_component.gd      # GUT: test_ prefix required
    │   └── HealthComponentTest.cs        # gdUnit4 C#: [TestSuite] attribute
    ├── integration/
    │   ├── test_player_scene.gd
    │   └── PlayerSceneTest.cs
    └── gut_config.json                   # GUT configuration (optional)

Naming conventions

Framework	GDScript file	C# file	Test method prefix/attribute
GUT	`test_*.gd`	N/A	`func test_*()`
gdUnit4	`test_*.gd`	`*Test.cs`	`func test_*()` / `[TestCase]`

Running Tests

See references/running-tests.md for full GUT and gdUnit4 CLI invocations + a copy-pasteable GitHub Actions workflow.

Testing Patterns

See references/testing-patterns.md for full code on each pattern (GDScript + C# where applicable).

Common Assertions

GUT assertions

Assertion	Description
`assert_eq(actual, expected)`	Equality
`assert_ne(actual, expected)`	Not equal
`assert_true(value)`	Is truthy
`assert_false(value)`	Is falsy
`assert_null(value)`	Is null
`assert_not_null(value)`	Is not null
`assert_gt(actual, expected)`	Greater than
`assert_lt(actual, expected)`	Less than
`assert_gte(actual, expected)`	Greater than or equal
`assert_lte(actual, expected)`	Less than or equal
`assert_has(collection, item)`	Collection contains item
`assert_does_not_have(collection, item)`	Collection does not contain item
`assert_string_contains(str, sub)`	String contains substring
`assert_almost_eq(actual, expected, margin)`	Float equality within margin
`assert_signal_emitted(obj, signal_name)`	Signal was emitted
`assert_signal_not_emitted(obj, signal_name)`	Signal was not emitted

gdUnit4 assertions (GDScript + C#)

GDScript	C#	Description
`assert_that(val).is_equal(exp)`	`AssertThat(val).IsEqual(exp)`	Equality
`assert_that(val).is_not_equal(exp)`	`AssertThat(val).IsNotEqual(exp)`	Not equal
`assert_that(val).is_true()`	`AssertThat(val).IsTrue()`	Is true
`assert_that(val).is_false()`	`AssertThat(val).IsFalse()`	Is false
`assert_that(val).is_null()`	`AssertThat(val).IsNull()`	Is null
`assert_that(val).is_not_null()`	`AssertThat(val).IsNotNull()`	Is not null
`assert_that(val).is_greater(exp)`	`AssertThat(val).IsGreater(exp)`	Greater than
`assert_that(val).is_less(exp)`	`AssertThat(val).IsLess(exp)`	Less than
`assert_that(val).is_between(min, max)`	`AssertThat(val).IsBetween(min, max)`	In range (inclusive)
`assert_that(arr).contains([a, b])`	`AssertThat(arr).Contains(a, b)`	Array contains elements
`assert_that(str).contains("sub")`	`AssertThat(str).Contains("sub")`	String contains substring
`assert_that(val).is_approximately(exp, margin)`	`AssertThat(val).IsApproximately(exp, margin)`	Float within margin
`assert_signal(mon).is_emitted("name")`	`AssertSignal(mon).IsEmitted("name")`	Signal emitted

What NOT to Test

Avoid testing things that add noise without catching real bugs:

Godot engine internals — do not assert that Node.add_child() works or that @export variables show up in the editor
Private implementation details — test behavior through the public API; if a refactor breaks a test that covers only private state, the test is wrong
Visual/rendering output — pixel-level rendering results are brittle; test the data driving the visuals instead
Timing-sensitive floats without margins — use assert_almost_eq / IsApproximately for physics values
One-liners that wrap a built-in — a property getter that just returns a field needs no test
Every possible invalid input — test the documented contract, not every imaginable misuse

Checklist

Each test file matches the naming convention for the chosen framework (test_*.gd / *Test.cs)
Tests extend the correct base class (GutTest / GdUnit4.GdUnitTestSuite)
Nodes added to the scene tree use add_child_autofree or auto_free — never manual queue_free()
Signals are watched before the action that triggers them
Mocks/doubles are used for external dependencies, not for the unit under test
Each test covers exactly one behavior (one logical assertion per test)
CI workflow runs tests headlessly on every push and PR
Flaky async tests use explicit timeouts, not arbitrary sleep durations
Tests pass before merging (RED is only acceptable while actively implementing)

View source ↗

File metadata

name: godot-testing
description: Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#

View original text

---
name: godot-testing
description: Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#
---

# Godot Testing

This skill covers test-driven development (TDD) for Godot 4.3+ projects using GUT (Godot Unit Testing) and gdUnit4. It includes framework selection, full RED-GREEN-REFACTOR examples, test structure, running tests in CI, and common testing patterns.

> **Related skills:** **godot-code-review** for review checklists, **dependency-injection** for test-friendly architecture, **export-pipeline** for CI/CD test automation.

## Framework Selection

| Feature               | GUT                              | gdUnit4                           |
|-----------------------|----------------------------------|-----------------------------------|
| Language              | GDScript-first, limited C#       | GDScript + C# (first-class)       |
| Install               | AssetLib or git submodule        | AssetLib or git submodule         |
| Editor integration    | Built-in GUT panel               | Built-in inspector + panel        |
| Mocking               | `double()` / `stub()` API        | `mock()` / `spy()` API            |
| Scene testing         | `add_child_autofree()`           | `auto_free()` + scene runner      |
| CI support            | `gut_cmdln.gd` CLI script        | `gdunit4_runner` CLI script       |
| C# support            | Minimal (GDScript wrappers only) | Native C# assertions + lifecycle  |
| Maturity              | Established (Godot 3 + 4)        | Godot 4 focused, actively updated |
| Best for              | Pure GDScript projects           | Mixed GDScript/C# or C#-only      |

**Rule of thumb:** Use GUT for GDScript-only projects. Use gdUnit4 for C# projects or when you need first-class C# support and scene runner utilities.

---

## TDD Workflow: RED-GREEN-REFACTOR

The standard Test-Driven Development cycle: write a failing test (RED), write minimal code to pass (GREEN), then refactor without breaking the test. Each step has its own discipline — don't skip RED (you'll write tests that pass trivially), and don't skip REFACTOR (technical debt compounds).

> See [references/tdd-workflow.md](references/tdd-workflow.md) for a worked GDScript + C# example walking through all three steps on a HealthComponent.

---

## Test Directory Structure

```
res://
├── src/
│   └── components/
│       ├── health_component.gd
│       └── HealthComponent.cs
└── tests/
    ├── unit/
    │   ├── test_health_component.gd      # GUT: test_ prefix required
    │   └── HealthComponentTest.cs        # gdUnit4 C#: [TestSuite] attribute
    ├── integration/
    │   ├── test_player_scene.gd
    │   └── PlayerSceneTest.cs
    └── gut_config.json                   # GUT configuration (optional)
```

### Naming conventions

| Framework | GDScript file       | C# file              | Test method prefix/attribute |
|-----------|---------------------|----------------------|------------------------------|
| GUT       | `test_*.gd`         | N/A                  | `func test_*()`              |
| gdUnit4   | `test_*.gd`         | `*Test.cs`           | `func test_*()` / `[TestCase]` |

---

## Running Tests

Both frameworks ship a CLI runner. **GUT:** `addons/gut/gut_cmdln.gd` invoked via `godot --headless --path . -s addons/gut/gut_cmdln.gd`. **gdUnit4:** `--add-gdunit-test-runner` argument, or via the editor "GdUnit Tests" dock. CI: tag-triggered or PR-triggered GitHub Action that installs Godot, runs the suite, exits non-zero on failure.

> See [references/running-tests.md](references/running-tests.md) for full GUT and gdUnit4 CLI invocations + a copy-pasteable GitHub Actions workflow.

---

## Testing Patterns

Four common patterns: **scenes with nodes** (instantiate via `add_child` in `before_each`, free in `after_each`), **signal testing** (assert that emitting works and connect-then-emit fires), **mocking/doubling** (gdUnit4 `Mock<T>` or hand-rolled fakes via `@export` injection), **async** (await yields, signals, frames in tests).

> See [references/testing-patterns.md](references/testing-patterns.md) for full code on each pattern (GDScript + C# where applicable).

---

## Common Assertions

### GUT assertions

| Assertion                                    | Description                        |
|----------------------------------------------|------------------------------------|
| `assert_eq(actual, expected)`                | Equality                           |
| `assert_ne(actual, expected)`                | Not equal                          |
| `assert_true(value)`                         | Is truthy                          |
| `assert_false(value)`                        | Is falsy                           |
| `assert_null(value)`                         | Is null                            |
| `assert_not_null(value)`                     | Is not null                        |
| `assert_gt(actual, expected)`                | Greater than                       |
| `assert_lt(actual, expected)`                | Less than                          |
| `assert_gte(actual, expected)`               | Greater than or equal              |
| `assert_lte(actual, expected)`               | Less than or equal                 |
| `assert_has(collection, item)`               | Collection contains item           |
| `assert_does_not_have(collection, item)`     | Collection does not contain item   |
| `assert_string_contains(str, sub)`           | String contains substring          |
| `assert_almost_eq(actual, expected, margin)` | Float equality within margin       |
| `assert_signal_emitted(obj, signal_name)`    | Signal was emitted                 |
| `assert_signal_not_emitted(obj, signal_name)`| Signal was not emitted             |

### gdUnit4 assertions (GDScript + C#)

| GDScript                                           | C#                                              | Description                     |
|----------------------------------------------------|-------------------------------------------------|---------------------------------|
| `assert_that(val).is_equal(exp)`                   | `AssertThat(val).IsEqual(exp)`                  | Equality                        |
| `assert_that(val).is_not_equal(exp)`               | `AssertThat(val).IsNotEqual(exp)`               | Not equal                       |
| `assert_that(val).is_true()`                       | `AssertThat(val).IsTrue()`                      | Is true                         |
| `assert_that(val).is_false()`                      | `AssertThat(val).IsFalse()`                     | Is false                        |
| `assert_that(val).is_null()`                       | `AssertThat(val).IsNull()`                      | Is null                         |
| `assert_that(val).is_not_null()`                   | `AssertThat(val).IsNotNull()`                   | Is not null                     |
| `assert_that(val).is_greater(exp)`                 | `AssertThat(val).IsGreater(exp)`                | Greater than                    |
| `assert_that(val).is_less(exp)`                    | `AssertThat(val).IsLess(exp)`                   | Less than                       |
| `assert_that(val).is_between(min, max)`            | `AssertThat(val).IsBetween(min, max)`           | In range (inclusive)            |
| `assert_that(arr).contains([a, b])`                | `AssertThat(arr).Contains(a, b)`                | Array contains elements         |
| `assert_that(str).contains("sub")`                 | `AssertThat(str).Contains("sub")`               | String contains substring       |
| `assert_that(val).is_approximately(exp, margin)`   | `AssertThat(val).IsApproximately(exp, margin)`  | Float within margin             |
| `assert_signal(mon).is_emitted("name")`            | `AssertSignal(mon).IsEmitted("name")`           | Signal emitted                  |

---

## What NOT to Test

Avoid testing things that add noise without catching real bugs:

- **Godot engine internals** — do not assert that `Node.add_child()` works or that `@export` variables show up in the editor
- **Private implementation details** — test behavior through the public API; if a refactor breaks a test that covers only private state, the test is wrong
- **Visual/rendering output** — pixel-level rendering results are brittle; test the data driving the visuals instead
- **Timing-sensitive floats without margins** — use `assert_almost_eq` / `IsApproximately` for physics values
- **One-liners that wrap a built-in** — a property getter that just returns a field needs no test
- **Every possible invalid input** — test the documented contract, not every imaginable misuse

---

## Checklist

- [ ] Each test file matches the naming convention for the chosen framework (`test_*.gd` / `*Test.cs`)
- [ ] Tests extend the correct base class (`GutTest` / `GdUnit4.GdUnitTestSuite`)
- [ ] Nodes added to the scene tree use `add_child_autofree` or `auto_free` — never manual `queue_free()`
- [ ] Signals are watched before the action that triggers them
- [ ] Mocks/doubles are used for external dependencies, not for the unit under test
- [ ] Each test covers exactly one behavior (one logical assertion per test)
- [ ] CI workflow runs tests headlessly on every push and PR
- [ ] Flaky async tests use explicit timeouts, not arbitrary sleep durations
- [ ] Tests pass before merging (RED is only acceptable while actively implementing)

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Source repository: jame581/GodotPrompter
License: MIT
Version: Unknown
Last GitHub push: Sep 20, 2026
Registry updated: Sep 29, 2026
Instruction path: skills/godot-testing/SKILL.md @ 3e8d0f005f96

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Permission surface may require sandboxing
AI review approval is missing
Quality score needs review
Permission surface needs review: shell or command execution, filesystem or document access
Permission surface: shell or command execution, filesystem or document access
Review status: AI review approval is missing

Verified installs: —
Outcomes: —

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    "description": "Use when writing tests for Godot projects — TDD workflow with GUT and gdUnit4, covers both GDScript and C#",
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      "documentation": "Strong README/SKILL.md context",
      "agentOutcomes": "No agent outcome data yet"
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    "High-risk permission hints: Shell or command execution",
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      "Audit: 80/100 Needs review",
      "Safety: 52/100 Avoid automatic install",
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}

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Creator: jame581
Source: jame581/GodotPrompter
Indexed by: OpenAgentSkill community index

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