Fix thunk tests

`unwrap_nested_exception()` now supports `DTaskFailedException` so we can match
against the real exceptions thrown.

Author: JamesWrigley

test/thunk.jl

@@ -69,7 +69,7 @@ end
         A = rand(4, 4)
         @test fetch(@spawn sum(A; dims=1)) ≈ sum(A; dims=1)
 
-        @test_throws_unwrap Dagger.DTaskFailedException fetch(@spawn sum(A; fakearg=2))
+        @test_throws_unwrap MethodError fetch(@spawn sum(A; fakearg=2))
 
         @test fetch(@spawn reduce(+, A; dims=1, init=2.0)) ≈
               reduce(+, A; dims=1, init=2.0)
@@ -194,7 +194,7 @@ end
             a = @spawn error("Test")
             wait(a)
             @test isready(a)
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(a)
+            @test_throws_unwrap ErrorException fetch(a)
             b = @spawn 1+2
             @test fetch(b) == 3
         end
@@ -207,7 +207,6 @@ end
             catch err
                 err
             end
-            ex = Dagger.Sch.unwrap_nested_exception(ex)
             ex_str = sprint(io->Base.showerror(io,ex))
             @test occursin(r"^DTaskFailedException:", ex_str)
             @test occursin("Test", ex_str)
@@ -218,44 +217,43 @@ end
             catch err
                 err
             end
-            ex = Dagger.Sch.unwrap_nested_exception(ex)
             ex_str = sprint(io->Base.showerror(io,ex))
             @test occursin("Test", ex_str)
             @test occursin("Root Task", ex_str)
         end
         @testset "single dependent" begin
             a = @spawn error("Test")
             b = @spawn a+2
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(a)
+            @test_throws_unwrap ErrorException fetch(a)
         end
         @testset "multi dependent" begin
             a = @spawn error("Test")
             b = @spawn a+2
             c = @spawn a*2
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(b)
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(c)
+            @test_throws_unwrap ErrorException fetch(b)
+            @test_throws_unwrap ErrorException fetch(c)
         end
         @testset "dependent chain" begin
             a = @spawn error("Test")
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(a)
+            @test_throws_unwrap ErrorException fetch(a)
             b = @spawn a+1
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(b)
+            @test_throws_unwrap ErrorException fetch(b)
             c = @spawn b+2
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(c)
+            @test_throws_unwrap ErrorException fetch(c)
         end
         @testset "single input" begin
             a = @spawn 1+1
             b = @spawn (a->error("Test"))(a)
             @test fetch(a) == 2
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(b)
+            @test_throws_unwrap ErrorException fetch(b)
         end
         @testset "multi input" begin
             a = @spawn 1+1
             b = @spawn 2*2
             c = @spawn ((a,b)->error("Test"))(a,b)
             @test fetch(a) == 2
             @test fetch(b) == 4
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(c)
+            @test_throws_unwrap ErrorException fetch(c)
         end
         @testset "diamond" begin
             a = @spawn 1+1
@@ -265,9 +263,10 @@ end
             @test fetch(a) == 2
             @test fetch(b) == 3
             @test fetch(c) == 4
-            @test_throws_unwrap Dagger.DTaskFailedException fetch(d)
+            @test_throws_unwrap ErrorException fetch(d)
         end
     end
+
     @testset "remote spawn" begin
         a = fetch(Distributed.@spawnat 2 Dagger.@spawn 1+2)
         @test Dagger.Sch.EAGER_INIT[]
@@ -283,7 +282,7 @@ end
             t1 = Dagger.@spawn 1+"fail"
             Dagger.@spawn t1+1
         end
-        @test_throws_unwrap Dagger.DTaskFailedException fetch(t2)
+        @test_throws_unwrap MethodError fetch(t2)
     end
     @testset "undefined function" begin
         # Issues #254, #255