Test for DimensionError

Author: MilesCranmer

src/utils.jl

@@ -86,7 +86,7 @@ tryrationalize(::Type{R}, x::R) where {R} = x
 tryrationalize(::Type{R}, x::Union{Rational,Integer}) where {R} = convert(R, x)
 tryrationalize(::Type{R}, x) where {R} = isinteger(x) ? convert(R, round(Int, x)) : convert(R, rationalize(Int, x))
 
-Base.showerror(io::IO, e::DimensionError) = print(io, "DimensionError: ", e.q1, " and ", e.q2, " have different dimensions")
+Base.showerror(io::IO, e::DimensionError) = print(io, "DimensionError: ", e.q1, " and ", e.q2, " have incompatible dimensions")
 
 """
     ustrip(q::Quantity)

test/unittests.jl

@@ -41,6 +41,18 @@ using Test
 
         @test_throws DimensionError x^2 + x
 
+        # Check output of error:
+        try
+            x^2 + x
+            @test false
+        catch e
+            r"DimensionError: .* and .* have incompatible dimensions."
+            io = IOBuffer()
+            showerror(io, e)
+            msg = String(take!(io))
+            @test occursin("DimensionError", msg)
+            @test occursin("incompatible dimensions", msg)
+        end
 
         y = inv(x)