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v/vlib/compiler/tests/string_interpolation_struct_test.v

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// This file tests whether V can generate a convenience default .str() method
// for a custom struct, when the developer has not defined one himself.
// The .str() methods are used for string interpolation and for println() calls.
struct Man {
name string
age int
interests []string
}
fn test_default_struct_string_interpolation(){
superman := Man{'Superman', 30, ['flying','fighting evil','being nice']}
s := '$superman'
assert s.contains('Man {')
assert s.contains('name: Superman')
assert s.contains('age: 30')
assert s.contains('interests: [')
assert s.contains('"being nice"')
assert s.contains('}')
//println(s)
}