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Add tests for Metamodel::Primitives parameterization methods #634

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Add tests for Metamodel::Primitives parameterization methods #634

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48 changes: 47 additions & 1 deletion S12-meta/primitives.t
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@ use v6;

use Test;

plan 20;
plan 26;

{
my $union-type-checks = 0;
Expand Down Expand Up @@ -106,3 +106,49 @@ plan 20;
'Can rebless to a target mixin type';
is $obj.HOW.name, 'to', 'Object has expected type after rebless';
}

{
my class ParametricHOW does Metamodel::Naming {
# The work required for creating types is handled outside of here.
}

my class ParameterizedHOW does Metamodel::Naming {
has @!parameters is required;

submethod BUILD(::?CLASS:D: :@parameters! --> Nil) {
@!parameters := @parameters;
}

method new_type(::?CLASS:_: @parameters, Str:D :$name! --> Mu) {
my ::?CLASS:D $meta := self.bless: :@parameters;
my Mu $obj := Metamodel::Primitives.create_type: $meta, 'Uninstantiable';
$meta.set_name: $obj, $name;
$obj
}

method parameters(::?CLASS:D: Mu) { @!parameters }
}

my Mu $parametric := Metamodel::Primitives.create_type: ParametricHOW.new, 'Uninstantiable';
$parametric.^set_name: 'Parametric'; # Eases debugging.
lives-ok {
Metamodel::Primitives.set_parameterizer: $parametric, -> Mu \obj, @parameters {
my Str:D $name = 'Parameterized';
ParameterizedHOW.new_type: @parameters, :$name
}
}, 'can set the parameterizer for a metaobject';

my Mu $parameterized := Nil;
my Mu $parameter .= new; # Intentionally containerized with Scalar.
lives-ok {
$parameterized := Metamodel::Primitives.parameterize_type: $parametric, $parameter
}, 'can parameterize metaobjects';
cmp-ok $parameterized.^parameters.[0], &[=:=], $parameter,
'type parameters passed to the parameterizer for a metaobject keep their original containers';
cmp-ok Metamodel::Primitives.type_parameterized($parameterized), &[=:=], $parametric,
'can get the parametric type of the result of a parameterization';
cmp-ok Metamodel::Primitives.type_parameters($parameterized).[0], &[=:=], $parameter,
'can get the type parameters of the result of a parameterization';
cmp-ok Metamodel::Primitives.type_parameter_at($parameterized, 0), &[=:=], $parameter,
'can get a specific type parameter of the result of a parameterization';
}