diff --git a/spec/functions/set-nth/map/comma-list/expected_output.css b/spec/functions/set-nth/map/comma-list/expected_output.css
new file mode 100644
index 0000000000..37668065e7
--- /dev/null
+++ b/spec/functions/set-nth/map/comma-list/expected_output.css
@@ -0,0 +1,9 @@
+foo {
+  set: red 50px, number 20px;
+  set-type: list;
+  before: (key: value, number: 20px);
+  after: (red 50px, null), number 20px;
+  length: 2;
+  key: red 50px;
+  key-type: list;
+  value1-type: null; }
diff --git a/spec/functions/set-nth/map/comma-list/input.scss b/spec/functions/set-nth/map/comma-list/input.scss
new file mode 100644
index 0000000000..8ce2dc3ee2
--- /dev/null
+++ b/spec/functions/set-nth/map/comma-list/input.scss
@@ -0,0 +1,19 @@
+$map : (
+  key : value,
+  number : 20px
+);
+
+$index: 1;
+$val: red 50px, null;
+
+foo {
+  set: set-nth($map, $index, $val);
+  set-type: type-of(set-nth($map, $index, $val));
+  before: inspect($map);
+  $map: set-nth($map, $index, $val);
+  after: inspect($map);
+  length: length(nth($map, $index));
+  key: inspect(nth(nth($map, $index), 1));
+  key-type: type-of(nth(nth($map, $index), 1));
+  value1-type: type-of(nth(nth($map, $index), 2));
+}
\ No newline at end of file
diff --git a/spec/functions/set-nth/map/comma-lists/expected_output.css b/spec/functions/set-nth/map/comma-lists/expected_output.css
new file mode 100644
index 0000000000..d350225b32
--- /dev/null
+++ b/spec/functions/set-nth/map/comma-lists/expected_output.css
@@ -0,0 +1,9 @@
+foo {
+  set: red 50px, , foobar, number 20px;
+  set-type: list;
+  before: (key: value, number: 20px);
+  after: (red 50px, null null, foobar), number 20px;
+  length: 3;
+  key: red 50px;
+  key-type: list;
+  value1-type: list; }
diff --git a/spec/functions/set-nth/map/comma-lists/input.scss b/spec/functions/set-nth/map/comma-lists/input.scss
new file mode 100644
index 0000000000..bc5c95d2c1
--- /dev/null
+++ b/spec/functions/set-nth/map/comma-lists/input.scss
@@ -0,0 +1,19 @@
+$map : (
+  key : value,
+  number : 20px
+);
+
+$index: 1;
+$val: red 50px, null null, foobar;
+
+foo {
+  set: set-nth($map, $index, $val);
+  set-type: type-of(set-nth($map, $index, $val));
+  before: inspect($map);
+  $map: set-nth($map, $index, $val);
+  after: inspect($map);
+  length: length(nth($map, $index));
+  key: inspect(nth(nth($map, $index), 1));
+  key-type: type-of(nth(nth($map, $index), 1));
+  value1-type: type-of(nth(nth($map, $index), 2));
+}
\ No newline at end of file
diff --git a/spec/functions/set-nth/map/only-key/expected_output.css b/spec/functions/set-nth/map/only-key/expected_output.css
new file mode 100644
index 0000000000..e59683d266
--- /dev/null
+++ b/spec/functions/set-nth/map/only-key/expected_output.css
@@ -0,0 +1,8 @@
+foo {
+  set: red, number 20px;
+  set-type: list;
+  before: (key: value, number: 20px);
+  after: red, number 20px;
+  length: 1;
+  key: red;
+  key-type: color; }
diff --git a/spec/functions/set-nth/map/only-key/input.scss b/spec/functions/set-nth/map/only-key/input.scss
new file mode 100644
index 0000000000..cb19406278
--- /dev/null
+++ b/spec/functions/set-nth/map/only-key/input.scss
@@ -0,0 +1,18 @@
+$map : (
+  key : value,
+  number : 20px
+);
+
+$index: 1;
+$val: red;
+
+foo {
+  set: set-nth($map, $index, $val);
+  set-type: type-of(set-nth($map, $index, $val));
+  before: inspect($map);
+  $map: set-nth($map, $index, $val);
+  after: inspect($map);
+  length: length(nth($map, $index));
+  key: inspect(nth(nth($map, $index), 1));
+  key-type: type-of(nth(nth($map, $index), 1));
+}
\ No newline at end of file
diff --git a/spec/functions/set-nth/map/options.yml b/spec/functions/set-nth/map/options.yml
new file mode 100644
index 0000000000..51f18a5afb
--- /dev/null
+++ b/spec/functions/set-nth/map/options.yml
@@ -0,0 +1,4 @@
+---
+:start_version: '3.4'
+:todo:
+- libsass
diff --git a/spec/functions/set-nth/map/simple/expected_output.css b/spec/functions/set-nth/map/simple/expected_output.css
new file mode 100644
index 0000000000..c2d842ee76
--- /dev/null
+++ b/spec/functions/set-nth/map/simple/expected_output.css
@@ -0,0 +1,9 @@
+foo {
+  set: red 50px, number 20px;
+  set-type: list;
+  before: (key: value, number: 20px);
+  after: red 50px, number 20px;
+  length: 2;
+  key: red;
+  key-type: color;
+  value-type: number; }
diff --git a/spec/functions/set-nth/map/simple/input.scss b/spec/functions/set-nth/map/simple/input.scss
new file mode 100644
index 0000000000..b108c0e2da
--- /dev/null
+++ b/spec/functions/set-nth/map/simple/input.scss
@@ -0,0 +1,19 @@
+$map : (
+  key : value,
+  number : 20px
+);
+
+$index: 1;
+$val: red 50px;
+
+foo {
+  set: set-nth($map, $index, $val);
+  set-type: type-of(set-nth($map, $index, $val));
+  before: inspect($map);
+  $map: set-nth($map, $index, $val);
+  after: inspect($map);
+  length: length(nth($map, $index));
+  key: inspect(nth(nth($map, $index), 1));
+  key-type: type-of(nth(nth($map, $index), 1));
+  value-type: type-of(nth(nth($map, $index), 2));
+}
\ No newline at end of file
diff --git a/spec/functions/set-nth/map/space-list/expected_output.css b/spec/functions/set-nth/map/space-list/expected_output.css
new file mode 100644
index 0000000000..82ab2b82c6
--- /dev/null
+++ b/spec/functions/set-nth/map/space-list/expected_output.css
@@ -0,0 +1,10 @@
+foo {
+  set: red 50px, number 20px;
+  set-type: list;
+  before: (key: value, number: 20px);
+  after: red 50px null, number 20px;
+  length: 3;
+  key: red;
+  key-type: color;
+  value1-type: number;
+  value2-type: null; }
diff --git a/spec/functions/set-nth/map/space-list/input.scss b/spec/functions/set-nth/map/space-list/input.scss
new file mode 100644
index 0000000000..037e8a6027
--- /dev/null
+++ b/spec/functions/set-nth/map/space-list/input.scss
@@ -0,0 +1,20 @@
+$map : (
+  key : value,
+  number : 20px
+);
+
+$index: 1;
+$val: red 50px null;
+
+foo {
+  set: set-nth($map, $index, $val);
+  set-type: type-of(set-nth($map, $index, $val));
+  before: inspect($map);
+  $map: set-nth($map, $index, $val);
+  after: inspect($map);
+  length: length(nth($map, $index));
+  key: inspect(nth(nth($map, $index), 1));
+  key-type: type-of(nth(nth($map, $index), 1));
+  value1-type: type-of(nth(nth($map, $index), 2));
+  value2-type: type-of(nth(nth($map, $index), 3));
+}
\ No newline at end of file