Testing Factory

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// State Factory
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const createUser = ({
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 id = 0,
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 firstName = '',
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 lastName = '',
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 userName = ''
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} = {}): User => ({
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 id: id,
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 firstName: firstName || 'firstName',
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 lastName: lastName || `lastName`,
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 userName: userName || `${firstName}.${lastName}`
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});
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​
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const createUsersState = ({
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entities = {
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'1': createUser({ id: 1, firstName: 'Bob' }), 
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'2': createUser({ id: 2, firstName: 'Sue' }), 
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'3': createUser({ id: 3, firstName: 'Mary' })
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 	},
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 	ids = ['1', '2', '3'], 
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selectedId = 0, 
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loading = false, 
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error = ''
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} = {}) => ({
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 users: {
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   ids,
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   entities,
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   selectedId,
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   loading,
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   error
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 }
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});	
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