From 5db70d159a76c958a31b10efea11ee6527fd87f9 Mon Sep 17 00:00:00 2001
From: mtfishman <mfishman@flatironinstitute.org>
Date: Wed, 15 Jan 2025 15:56:08 -0500
Subject: [PATCH 1/5] Fix setting zero dimensional block

---
 src/blocksparsearrayinterface/blocksparsearrayinterface.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/blocksparsearrayinterface/blocksparsearrayinterface.jl b/src/blocksparsearrayinterface/blocksparsearrayinterface.jl
index 0aace04d..46f95ca0 100644
--- a/src/blocksparsearrayinterface/blocksparsearrayinterface.jl
+++ b/src/blocksparsearrayinterface/blocksparsearrayinterface.jl
@@ -157,7 +157,8 @@ end
   a::AbstractArray{<:Any,0}, value, I::BlockIndex{0}
 )
   a_b = blocks(a)[]
-  a_b[] = value
+  # `value[]` handles scalars and 0-dimensional arrays.
+  a_b[] = value[]
   # Set the block, required if it is structurally zero.
   blocks(a)[] = a_b
   return a

From 944ac82bddfbe75fcb9944227672937fa4dd46d8 Mon Sep 17 00:00:00 2001
From: mtfishman <mfishman@flatironinstitute.org>
Date: Wed, 15 Jan 2025 17:20:32 -0500
Subject: [PATCH 2/5] Add tests

---
 Project.toml               | 2 +-
 examples/README.jl         | 3 +--
 test/basics/test_basics.jl | 6 ++++--
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/Project.toml b/Project.toml
index 2a2d8b2c..c7a8b187 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "BlockSparseArrays"
 uuid = "2c9a651f-6452-4ace-a6ac-809f4280fbb4"
 authors = ["ITensor developers <support@itensor.org> and contributors"]
-version = "0.2.7"
+version = "0.2.8"
 
 [deps]
 Adapt = "79e6a3ab-5dfb-504d-930d-738a2a938a0e"
diff --git a/examples/README.jl b/examples/README.jl
index 7374d883..2d00e5b0 100644
--- a/examples/README.jl
+++ b/examples/README.jl
@@ -87,8 +87,7 @@ function main()
   @test b[Block(1, 2)] == a₁₂
 
   ## Matrix multiplication
-  ## TODO: Fix this, broken.
-  @test_broken b * b ≈ Array(b) * Array(b)
+  @test b * b ≈ Array(b) * Array(b)
 
   permuted_b = permutedims(b, (2, 1))
   @test permuted_b isa BlockSparseArray
diff --git a/test/basics/test_basics.jl b/test/basics/test_basics.jl
index 71f5d15e..921fc82d 100644
--- a/test/basics/test_basics.jl
+++ b/test/basics/test_basics.jl
@@ -192,6 +192,9 @@ arrayts = (Array, JLArray)
       for b in (
         (b = copy(a); @allowscalar b[] = 2; b),
         (b = copy(a); @allowscalar b[CartesianIndex()] = 2; b),
+        (b = copy(a); @allowscalar b[CartesianIndex()] = 2; b),
+        # Regression test for https://github.com/ITensor/BlockSparseArrays.jl/issues/27.
+        (b = copy(a); @allowscalar b[Block()] = dev(fill(2)); b),
       )
         @test size(b) == ()
         @test isone(length(b))
@@ -202,8 +205,7 @@ arrayts = (Array, JLArray)
         @test @allowscalar(b[CartesianIndex()]) == 2
         @test b[Block()] == dev(fill(2))
         @test @allowscalar(b[Block()][]) == 2
-        # Broken:
-        ## @test b[Block()[]] == 2
+        @test b[Block()[]] == 2
       end
     end
 

From f431be0d3e890c88d94bd39470b4aec7f3ac62a9 Mon Sep 17 00:00:00 2001
From: mtfishman <mfishman@flatironinstitute.org>
Date: Wed, 15 Jan 2025 17:25:54 -0500
Subject: [PATCH 3/5] Update README

---
 README.md | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 40fdf33c..e2f415e4 100644
--- a/README.md
+++ b/README.md
@@ -82,8 +82,7 @@ function main()
   @test b[Block(1, 2)] == a₁₂
 
   # Matrix multiplication
-  # TODO: Fix this, broken.
-  @test_broken b * b ≈ Array(b) * Array(b)
+  @test b * b ≈ Array(b) * Array(b)
 
   permuted_b = permutedims(b, (2, 1))
   @test permuted_b isa BlockSparseArray

From 3a24990ad54ba07dfc0eaa5347595ccbd5e53e10 Mon Sep 17 00:00:00 2001
From: mtfishman <mfishman@flatironinstitute.org>
Date: Wed, 15 Jan 2025 17:27:57 -0500
Subject: [PATCH 4/5] Fix test

---
 test/basics/test_basics.jl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/basics/test_basics.jl b/test/basics/test_basics.jl
index 921fc82d..afe403fe 100644
--- a/test/basics/test_basics.jl
+++ b/test/basics/test_basics.jl
@@ -205,7 +205,7 @@ arrayts = (Array, JLArray)
         @test @allowscalar(b[CartesianIndex()]) == 2
         @test b[Block()] == dev(fill(2))
         @test @allowscalar(b[Block()][]) == 2
-        @test b[Block()[]] == 2
+        @test @allowscalar(b[Block()[]]) == 2
       end
     end
 

From f9d4c21d91f688c7cfac7765290e414d80b81886 Mon Sep 17 00:00:00 2001
From: mtfishman <mfishman@flatironinstitute.org>
Date: Wed, 15 Jan 2025 17:34:44 -0500
Subject: [PATCH 5/5] Update runtests

---
 test/runtests.jl | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/test/runtests.jl b/test/runtests.jl
index bd974411..1c52c3e1 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -24,9 +24,11 @@ isexamplefile(fn) =
   # tests in groups based on folder structure
   for testgroup in filter(isdir, readdir(@__DIR__))
     if GROUP == "ALL" || GROUP == uppercase(testgroup)
-      for file in filter(istestfile, readdir(joinpath(@__DIR__, testgroup); join=true))
+      groupdir = joinpath(@__DIR__, testgroup)
+      for file in filter(istestfile, readdir(groupdir))
+        filename = joinpath(groupdir, file)
         @eval @safetestset $file begin
-          include($file)
+          include($filename)
         end
       end
     end