diff --git a/test/iotaworks/subscript-accumulate.snbt b/test/iotaworks/subscript-accumulate.snbt
new file mode 100644
index 0000000..5a935de
--- /dev/null
+++ b/test/iotaworks/subscript-accumulate.snbt
@@ -0,0 +1,10 @@
+[
+  {vm: staff},
+  {push: {action: 'hexcasting:get_caster'}},
+  {push: 21},
+  {cast: {action: 'iotaworks:set_subscript'}},
+  {push: 21},
+  {cast: {action: 'iotaworks:set_subscript'}},
+  {cast: {action: 'iotaworks:get_subscript'}},
+  {check: 42}
+]
diff --git a/test/iotaworks/subscript-deserialize-parent.snbt b/test/iotaworks/subscript-deserialize-parent.snbt
new file mode 100644
index 0000000..9fd9abf
--- /dev/null
+++ b/test/iotaworks/subscript-deserialize-parent.snbt
@@ -0,0 +1,8 @@
+[
+  { vm: staff },
+  { push: {"hexcasting:type": "hexcasting:pattern", "hexcasting:data": {parent: {angles: [B; 5B, 4B, 5B], start_dir: 0b}, level: 42}} },
+  { cast: { action: 'hexcasting:duplicate' } },
+  { check: { action: 'hexcasting:get_caster' } },
+  { cast: { action: 'iotaworks:get_subscript' } },
+  { check: 42 },
+]
diff --git a/test/iotaworks/subscript-negative-store.snbt b/test/iotaworks/subscript-negative-store.snbt
new file mode 100644
index 0000000..94b1a92
--- /dev/null
+++ b/test/iotaworks/subscript-negative-store.snbt
@@ -0,0 +1,15 @@
+[
+  {vm: staff},
+  {push: 1}, {push: 2}, {push: 3},
+  {push: {action: 'hexcasting:swap'}},
+  {push: -1},
+  {cast: {action: 'iotaworks:set_subscript'}},
+  {cast: {action: 'hexcasting:eval'}},
+  {check: {'hexcasting:type':'hexcasting:null','hexcasting:data':{}}}, {check: 2}, {check: 1},
+  {push: 4},
+  {push: {action: 'hexcasting:swap'}},
+  {push: -1},
+  {cast: {action: 'iotaworks:set_subscript'}},
+  {cast: {action: 'hexcasting:eval'}},
+  {check: 3}
+]
diff --git a/test/iotaworks/subscript-positive-dip.snbt b/test/iotaworks/subscript-positive-dip.snbt
new file mode 100644
index 0000000..cb3a740
--- /dev/null
+++ b/test/iotaworks/subscript-positive-dip.snbt
@@ -0,0 +1,9 @@
+[
+  {vm: staff},
+  {push: 1}, {push: 2}, {push: 3},
+  {push: {action: 'hexcasting:swap'}},
+  {push: 1},
+  {cast: {action: 'iotaworks:set_subscript'}},
+  {cast: {action: 'hexcasting:eval'}},
+  {check: 3}, {check: 1}, {check: 2}
+]
diff --git a/test/iotaworks/subscript-serialized.snbt b/test/iotaworks/subscript-serialized.snbt
new file mode 100644
index 0000000..c90c212
--- /dev/null
+++ b/test/iotaworks/subscript-serialized.snbt
@@ -0,0 +1,10 @@
+[
+  {vm: staff},
+  {push: {action: 'hexcasting:get_caster'}},
+  {push: 42},
+  {cast: {action: 'iotaworks:set_subscript'}},
+  {cast: {action: 'hexcasting:write/local'}},
+  {cast: {action: 'hexcasting:read/local'}},
+  {cast: {action: 'iotaworks:get_subscript'}},
+  {check: 42}
+]
diff --git a/test/iotaworks/subscript-stored.snbt b/test/iotaworks/subscript-stored.snbt
new file mode 100644
index 0000000..c99dbe0
--- /dev/null
+++ b/test/iotaworks/subscript-stored.snbt
@@ -0,0 +1,8 @@
+[
+  {vm: staff},
+  {push: {action: 'hexcasting:get_caster'}},
+  {push: 42},
+  {cast: {action: 'iotaworks:set_subscript'}},
+  {cast: {action: 'iotaworks:get_subscript'}},
+  {check: 42}
+]