Drop StaticSquareMatrix & add more test.

1. remove `StaticSquareMatrix` (`StaticMatrix{N,N}` should be shorter and clear enough)
2. Add missing Test.

src/convert.jl

@@ -18,7 +18,6 @@ end
 @pure has_size1(::Type{<:StaticMatrix{M}}) where {M} = @isdefined M
 @pure has_size1(::Type{<:StaticMatrix}) = false
 _size1(::Type{<:StaticMatrix{M}}) where {M} = M
-StaticSquareMatrix{N,T} = StaticMatrix{N,N,T}
 @generated function _sqrt(::Length{L}) where {L}
  N = round(Int, sqrt(L))
  N^2 == L || throw(DimensionMismatch("Input's length must be perfect square"))
@@ -73,7 +72,7 @@ function adapt_size(::Type{SA}, x) where {SA<:StaticArray}
  M = len ÷ N
  M * N == len || throw(DimensionMismatch("Incorrect matrix sizes. $len does not divide $N elements"))
  SZ = Tuple{N, M}
- elseif SA <: StaticSquareMatrix
+ elseif SA <: StaticMatrix{N,N} where {N}
  N = _sqrt(Length(len))
  SZ = Tuple{N, N}
  elseif x isa StaticArray

test/SizedArray.jl

@@ -31,6 +31,7 @@
  @test @inferred(SizedArray{Tuple{2,2}}([1 2;3 4]))::SizedArray{Tuple{2,2},Int,2,2} == [1 2; 3 4]
  # From Array, reshaped
  @test @inferred(SizedArray{Tuple{2,2}}([1,2,3,4]))::SizedArray{Tuple{2,2},Int,2,1} == [1 3; 2 4]
+ @test SizedArray{Tuple{4}}([1 2; 3 4]) == vec([1 2; 3 4])
  @test_throws DimensionMismatch SizedArray{Tuple{1,4}}([1 2; 3 4])
  # Uninitialized
  @test @inferred(SizedArray{Tuple{2,2},Int,2,2,Matrix{Int}}(undef)) isa SizedArray{Tuple{2,2},Int,2,2,Matrix{Int}}
@@ -76,6 +77,9 @@
  # Reshaping
  @test @inferred(SizedMatrix{2,2}([1,2,3,4]))::SizedArray{Tuple{2,2},Int,2,1} == [1 3; 2 4]
  @test @inferred(SizedMatrix{2,2}((1,2,3,4)))::SizedArray{Tuple{2,2},Int,2,2} == [1 3; 2 4]
+ @test @inferred(SizedMatrix{2,2,Int}(SVector(1,2,3,4)))::SizedMatrix{2,2,Int,2} == [1 3; 2 4]
+ @test @inferred(SizedMatrix{2,2,Int,1}(SVector(1,2,3,4)))::SizedMatrix{2,2,Int,1} == [1 3; 2 4]
+ @test @inferred(SizedMatrix{2,2,Int,1,SVector{4,Int}}(SVector(1,2,3,4)))::SizedMatrix{2,2,Int,1} == [1 3; 2 4]
  # Back to Matrix
  @test Matrix(SizedMatrix{2,2}([1 2;3 4])) == [1 2; 3 4]
  @test convert(Matrix, SizedMatrix{2,2}([1 2;3 4])) == [1 2; 3 4]
@@ -268,6 +272,4 @@ Base.axes(::OVector) = (0:9,)
  @test (@inferred(SizedMatrix{1}(1, 2))::SizedMatrix{1,2,Int}) == reshape(1:2, 1, 2)
  @test (@inferred(SizedMatrix{2}((1, 2)))::SizedMatrix{2,1,Int}) == reshape(1:2, 2, 1)
  @test (@inferred(SizedMatrix{2}(1, 2))::SizedMatrix{2,1,Int}) == reshape(1:2, 2, 1)
-
-
 end