shard-spectator/spec/issues/github_issue_48_spec.cr

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require "../spec_helper"
Spectator.describe "GitHub Issue #48" do
class Test
def return_this(thing : T) : T forall T
thing
end
def map(thing : T, & : T -> U) : U forall T, U
yield thing
end
def make_nilable(thing : T) : T? forall T
thing.as(T?)
end
def itself : self
self
end
def itself? : self?
self.as(self?)
end
def generic(thing : T) : Array(T) forall T
Array.new(100) { thing }
end
def union : Int32 | String
42.as(Int32 | String)
end
def capture(&block : -> T) forall T
block
end
def capture(thing : T, &block : T -> T) forall T
block.call(thing)
block
end
def range(r : Range)
r
end
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end
mock Test, make_nilable: nil
let(fake) { mock(Test) }
it "handles free variables" do
allow(fake).to receive(:return_this).and_return("different")
expect(fake.return_this("test")).to eq("different")
end
it "raises on type cast error with free variables" do
allow(fake).to receive(:return_this).and_return(42)
expect { fake.return_this("test") }.to raise_error(TypeCastError, /String/)
end
it "handles free variables with a block" do
allow(fake).to receive(:map).and_return("stub")
expect(fake.map(:mapped, &.to_s)).to eq("stub")
end
it "raises on type cast error with a block and free variables" do
allow(fake).to receive(:map).and_return(42)
expect { fake.map(:mapped, &.to_s) }.to raise_error(TypeCastError, /String/)
end
it "handles nilable free variables" do
expect(fake.make_nilable("foo")).to be_nil
end
it "handles 'self' return type" do
not_self = mock(Test)
allow(fake).to receive(:itself).and_return(not_self)
expect(fake.itself).to be(not_self)
end
it "raises on type cast error with 'self' return type" do
allow(fake).to receive(:itself).and_return(42)
expect { fake.itself }.to raise_error(TypeCastError, /#{class_mock(Test)}/)
end
it "handles nilable 'self' return type" do
not_self = mock(Test)
allow(fake).to receive(:itself?).and_return(not_self)
expect(fake.itself?).to be(not_self)
end
it "handles generic return type" do
allow(fake).to receive(:generic).and_return([42])
expect(fake.generic(42)).to eq([42])
end
it "raises on type cast error with generic return type" do
allow(fake).to receive(:generic).and_return("test")
expect { fake.generic(42) }.to raise_error(TypeCastError, /Array\(Int32\)/)
end
it "handles union return types" do
allow(fake).to receive(:union).and_return("test")
expect(fake.union).to eq("test")
end
it "raises on type cast error with union return type" do
allow(fake).to receive(:union).and_return(:test)
expect { fake.union }.to raise_error(TypeCastError, /Symbol/)
end
it "handles captured blocks" do
proc = ->{}
allow(fake).to receive(:capture).and_return(proc)
expect(fake.capture { nil }).to be(proc)
end
it "raises on type cast error with captured blocks" do
proc = ->{ 42 }
allow(fake).to receive(:capture).and_return(proc)
expect { fake.capture { "other" } }.to raise_error(TypeCastError, /Proc\(String\)/)
end
it "handles captured blocks with arguments" do
proc = ->(x : Int32) { x * 2 }
allow(fake).to receive(:capture).and_return(proc)
expect(fake.capture(5) { 5 }).to be(proc)
end
it "handles range comparisons against non-comparable types" do
range = 1..10
allow(fake).to receive(:range).and_return(range)
expect(fake.range(1..3)).to eq(range)
end
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end