local userError = require('Dev:User error')
local missingOperand = userError('must provide 2 operands for $1')
return {
    addition = {
        options = {
            mode = 'invocation',
            preprocess = true
        },
        tests = {
            {
                nil,
                (missingOperand:gsub('$1', 'addition'))
            },
            { '1|2',     '{{#expr:1 + 2}}' }
        }
    },
    division = {
        options = {
            mode = 'invocation',
            preprocess = true
        },
        tests = {
            {
                nil,
                (missingOperand:gsub('$1', 'division'))
            },
            { '4|2',     '{{#expr:4 / 2}}' },
            { '4|2',     '{{#expr:4 / 2}}' },
            { '5|3',     '{{#expr:5 / 3}}' }
        }
    },
    modulo = {
        options = {
            mode = 'invocation',
            preprocess = true
        },
        tests = {
            {
                nil,
                (missingOperand:gsub('$1', 'modulo'))
            },
            { '4|2',   '{{#expr:4 mod 2}}' },
            { '5|3',   '{{#expr:5 mod 3}}' }
        }
    },
    multiplication = {
        options = {
            mode = 'invocation',
            preprocess = true
        },
        tests = {
            {
                nil,
                (missingOperand:gsub('$1', 'multiplication'))
            },
            { '10|10', '{{#expr:10 * 10}}' }
        }
    },
    subtraction = {
        options = {
            mode = 'invocation',
            preprocess = true
        },
        tests = {
            {
                nil,
                (missingOperand:gsub('$1', 'subtraction'))
            },
            { '2|1',     '{{#expr:2 - 1}}' },
            { '1|2',     '{{#expr:1 - 2}}' }
        }
    },
    exponentation = {
        options = {
            mode = 'invocation',
            preprocess = true
        },
        tests = {
            {
                nil,
                (missingOperand:gsub('$1', 'exponentation'))
            },
            { '2|1',     '{{#expr:2 ^ 1}}' },
            { '5|9',     '{{#expr:5 ^ 9}}' }
        }
    },
    main = {
        options = {
            mode = 'invocation',
            nowiki = true
        },
        tests = {
            { nil, 'you must specify a function to call', { ['err'] = true } }
        }
    }
}