Test Styles

go-testgen supports three test generation styles. Pass --style <name> to gen to select one.

Style	Flag value	Default?	Description
Check	--style check	Yes	Table-driven + closure check functions
Table	--style table	No	Table-driven + want value fields
Simple	--style simple	No	Standalone function, no table

Which Style to Use

Use check (default) when:

• The function has multiple return values.
• The function returns an error that may or may not be present.
• You want to assert different things in different test cases without adding columns to every row.
• The function has interface dependencies that need mocks configured per case.
• The receiver has state you need to mutate before acting (before field).

check is the most expressive style. It requires more initial setup but scales cleanly as assertions grow.

Use table when:

• The function is a pure transformation (input → output).
• A single DeepEqual covers all your assertions.
• You want the simplest possible test for a utility function.

Use simple when:

• The function has a single execution path.
• You want a standalone test, not a loop.
• The function is internal or very small.

Setting a Default Style

You can set a project-wide default style in .go-testgen.yaml:

test_style: check   # or table, simple

The --style flag always overrides the config file.