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v/vlib/context/value_test.v

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import context
const not_found_value = &Value{
val: 'key not found'
}
struct Value {
val string
}
// This example demonstrates how a value can be passed to the context
// and also how to retrieve it if it exists.
fn test_with_value() {
f := fn (ctx context.Context, key context.Key) &Value {
if value := ctx.value(key) {
match value {
Value {
return value
}
else {}
}
}
return not_found_value
}
key := 'language'
value := &Value{
val: 'VAL'
}
ctx := context.with_value(context.background(), key, value)
assert value == f(ctx, key)
assert not_found_value == f(ctx, 'color')
}