Improve test coverage

Author: lkdvos

src/tensors/diagonal.jl

@@ -39,12 +39,12 @@ Construct a `DiagonalTensorMap` with uninitialized data.
 """
 function DiagonalTensorMap{T}(::UndefInitializer, V::TensorMapSpace) where {T}
     (numin(V) == numout(V) == 1 && domain(V) == codomain(V)) ||
-        throw(SpaceMismatch("DiagonalTensorMap requires a space with equal domain and codomain and 2 indices"))
+        throw(ArgumentError("DiagonalTensorMap requires a space with equal domain and codomain and 2 indices"))
     return DiagonalTensorMap{T}(undef, domain(V))
 end
 function DiagonalTensorMap{T}(::UndefInitializer, V::ProductSpace) where {T}
     length(V) == 1 ||
-        throw(DimensionMismatch("DiagonalTensorMap requires `numin(d) == numout(d) == 1`"))
+        throw(ArgumentError("DiagonalTensorMap requires `numin(d) == numout(d) == 1`"))
     return DiagonalTensorMap{T}(undef, only(V))
 end
 function DiagonalTensorMap{T}(::UndefInitializer, V::S) where {T,S<:IndexSpace}

test/diagonal.jl

@@ -5,8 +5,16 @@ diagspacelist = ((ℂ^4)', ℂ[Z2Irrep](0 => 2, 1 => 3),
 @testset "DiagonalTensor with domain $V" for V in diagspacelist
     @timedtestset "Basic properties and algebra" begin
         for T in (Float32, Float64, ComplexF32, ComplexF64, BigFloat)
+            # constructors
             t = @constinferred DiagonalTensorMap{T}(undef, V)
             t = @constinferred DiagonalTensorMap(rand(T, reduceddim(V)), V)
+            t2 = @constinferred DiagonalTensorMap{T}(undef, space(t))
+            @test space(t2) == space(t)
+            @test_throws ArgumentError DiagonalTensorMap{T}(undef, V^2 ← V)
+            t2 = @constinferred DiagonalTensorMap{T}(undef, domain(t))
+            @test space(t2) == space(t)
+            @test_throws ArgumentError DiagonalTensorMap{T}(undef, V^2)
+            # properties
             @test @constinferred(hash(t)) == hash(deepcopy(t))
             @test scalartype(t) == T
             @test codomain(t) == ProductSpace(V)