{"manifest":{"name":"Table-Driven Test Generator","version":"1.0.0","description":"Generate complete Vitest/Jest/pytest table-driven tests for any function. Covers happy path, boundary values, null/undefined, async rejection, and type edge cases. Ready to run, zero placeholder text.","tags":["testing","vitest","jest","pytest","tdd","code-quality"],"standard":"agentskills.io","standard_version":"1.0","content_checksum":"54d2b0b67b2826588cc2bfadea75e21633a37f01a313d220209668ff9b106d29","bundle_checksum":null,"metadata":{},"files":[]},"files":{"SKILL.md":"# Table-Driven Test Generator\n\n> **Purpose:** Generate a complete, runnable test file for any function using table-driven tests (`it.each` / `test.each` in Vitest/Jest, parametrize in pytest). Covers: happy path, boundary values, null/undefined inputs, empty collections, async rejection, and type coercion edge cases. Output can be pasted directly into a `.test.ts` or `_test.py` file and run immediately.\n\n---\n\n## Invocation\n\n```\n/test \n```\n\n**Examples:**\n- `/test function add(a: number, b: number): number { return a + b }`\n- `/test async function fetchUser(id: string): Promise`\n- `/test def calculate_discount(price: float, pct: float) -> float:`\n\n---\n\n## Process\n\n### Step 1: Analyze the Function\n\nIdentify:\n- **Inputs**: types, constraints, optional vs required\n- **Output**: return type, possible return values\n- **Side effects**: async operations, mutations, I/O\n- **Failure modes**: throws, returns null, rejects, etc.\n\n---\n\n### Step 2: Design Test Cases\n\nFor every function, generate tests covering:\n\n| Category | Examples |\n|----------|---------|\n| Happy path | Typical inputs, expected output |\n| Boundary — low | 0, -1, empty string, empty array |\n| Boundary — high | MAX_SAFE_INTEGER, very long string, large array |\n| Null / undefined | null, undefined, missing optional param |\n| Type edge cases | NaN, Infinity, 0.1 + 0.2 floating point |\n| Async rejection | Network error, timeout, invalid response |\n| Error path | Invalid input → throws specific error |\n| Idempotency | Same input twice → same output |\n\n---\n\n### Step 3: Write the Test File\n\n**Vitest / Jest output:**\n\n```typescript\nimport { describe, it, expect, vi } from 'vitest'\nimport { functionName } from './module'\n\ndescribe('functionName', () => {\n it.each([\n // [description, input1, input2, ..., expected]\n ['happy path: typical inputs', arg1, arg2, expectedOutput],\n ['boundary: zero value', 0, arg2, expectedForZero],\n ['boundary: negative', -1, arg2, expectedForNegative],\n ['null input: first arg null', null, arg2, expectedForNull],\n ])('%s', (description, input1, input2, expected) => {\n // Arrange\n const input = buildInput(input1, input2)\n\n // Act\n const result = functionName(input1, input2)\n\n // Assert\n expect(result).toEqual(expected)\n })\n\n it('throws on invalid input', () => {\n // Arrange + Act + Assert\n expect(() => functionName(invalidInput)).toThrow('Expected error message')\n })\n\n it('handles async rejection gracefully', async () => {\n // Arrange\n vi.mocked(dependency).mockRejectedValue(new Error('Network error'))\n\n // Act + Assert\n await expect(functionName(input)).rejects.toThrow('Network error')\n })\n})\n```\n\n**pytest output:**\n\n```python\nimport pytest\nfrom module import function_name\n\n@pytest.mark.parametrize(\"description,input_val,expected\", [\n (\"happy path: typical input\", typical_input, expected_output),\n (\"boundary: zero\", 0, expected_for_zero),\n (\"boundary: negative\", -1, expected_for_neg),\n (\"None input\", None, expected_for_none),\n])\ndef test_function_name(description, input_val, expected):\n # Arrange + Act\n result = function_name(input_val)\n\n # Assert\n assert result == expected, f\"Failed: {description}\"\n\ndef test_function_name_raises_on_invalid():\n with pytest.raises(ValueError, match=\"Expected message\"):\n function_name(invalid_input)\n```\n\n---\n\n## Rules\n\n- Every test must follow AAA (Arrange / Act / Assert) with comment labels\n- The table must have at least 5 rows: 1 happy path + 4 edge cases\n- Async functions must include at least one rejection test\n- No placeholder text in the output — all test values must be concrete\n- If the function has side effects (DB write, HTTP call): add a mock setup block\n- Output must be runnable as-is — the only acceptable TODO is \"fill in real mock return value\"\n- Detect framework from function syntax: TypeScript → Vitest, Python → pytest, Go → `testing.T` table tests\n\n## Playground\n\n
Table-Driven Test GeneratorExample · SkillSlap
Input: Go function
func Clamp(v, min, max int) int {\n    if v < min { return min }\n    if v > max { return max }\n    return v\n}
Output: Table-driven tests
func TestClamp(t *testing.T) {\n  tests := []struct{\n    name     string\n    v,mn,mx  int\n    want     int\n  }{\n    {\"below min\", -5, 0, 10, 0},\n    {\"above max\", 15, 0, 10, 10},\n    {\"in range\",   5, 0, 10,  5},\n    {\"at min\",     0, 0, 10,  0},\n    {\"at max\",    10, 0, 10, 10},\n  }\n\n  for _, tc := range tests {\n    t.Run(tc.name, func(t *testing.T) {\n      got := Clamp(tc.v, tc.mn, tc.mx)\n      if got != tc.want {\n        t.Errorf(\"got %d want %d\",\n          got, tc.want)\n      }\n    })\n  }\n}
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