toHaveUnderline

Deprecated

Prefer toHaveAttrs which checks multiple attributes at once:

expect(term.cell(0, 0)).toHaveAttrs({ underline: true })

Assert that a cell has underline styling. Optionally check for a specific underline style.

Signature

expect(cell).toHaveUnderline(style?: UnderlineStyle)

Parameters

Parameter	Type	Description
style	UnderlineStyle	Optional specific style to check

UnderlineStyle: "single" | "double" | "curly" | "dotted" | "dashed"

Usage

// Any underline
expect(term.cell(0, 0)).toHaveUnderline()

// Specific underline style
expect(term.cell(0, 0)).toHaveUnderline("single")
expect(term.cell(0, 0)).toHaveUnderline("curly") // spell-check style
expect(term.cell(0, 0)).toHaveUnderline("double")
expect(term.cell(0, 0)).toHaveUnderline("dotted")
expect(term.cell(0, 0)).toHaveUnderline("dashed")

// Negation
expect(term.cell(0, 0)).not.toHaveUnderline()

Accepts

Region	Supported
term.cell(r, c)	Yes
term.screen	No
term.row(n)	No

Notes

• Without a style argument, matches any underline style
• Curly underline is commonly used for spell-check indicators
• Not all terminal backends support all underline styles

See Also

• toHaveAttrs - composable attribute matcher (preferred)
• toBeBold - bold styling
• toBeItalic - italic styling
• toBeStrikethrough - strikethrough styling