diff --git a/tests/modules/programs/discocss/basic-configuration.nix b/tests/modules/programs/discocss/basic-configuration.nix
new file mode 100644
index 000000000..92a30e81a
--- /dev/null
+++ b/tests/modules/programs/discocss/basic-configuration.nix
@@ -0,0 +1,34 @@
+{
+  config = {
+    programs.discocss = {
+      enable = true;
+      package = null;
+
+      discordAlias = false;
+
+      css = ''
+        /* Custom Discord theme */
+        .theme-dark {
+          --background-primary: #2f3136;
+          --background-secondary: #36393f;
+        }
+
+        .chat-3bRxxu {
+          background: var(--background-primary);
+        }
+
+        .content-yTz4x3:before {
+          content: "Custom CSS Loaded";
+          color: #43b581;
+        }
+      '';
+    };
+
+    nmt.script = ''
+      assertFileExists home-files/.config/discocss/custom.css
+      assertFileContent \
+        home-files/.config/discocss/custom.css \
+        ${./with-custom-css-expected.css}
+    '';
+  };
+}
diff --git a/tests/modules/programs/discocss/default.nix b/tests/modules/programs/discocss/default.nix
new file mode 100644
index 000000000..f6fe3bee5
--- /dev/null
+++ b/tests/modules/programs/discocss/default.nix
@@ -0,0 +1,5 @@
+{
+  discocss-basic-configuration = ./basic-configuration.nix;
+  discocss-no-packages = ./no-packages.nix;
+  discocss-no-css = ./no-css.nix;
+}
diff --git a/tests/modules/programs/discocss/no-css.nix b/tests/modules/programs/discocss/no-css.nix
new file mode 100644
index 000000000..a5a753ad9
--- /dev/null
+++ b/tests/modules/programs/discocss/no-css.nix
@@ -0,0 +1,12 @@
+{
+  config = {
+    programs.discocss = {
+      enable = true;
+      discordAlias = false;
+    };
+
+    nmt.script = ''
+      assertPathNotExists home-files/.config/discocss/custom.css
+    '';
+  };
+}
diff --git a/tests/modules/programs/discocss/no-packages.nix b/tests/modules/programs/discocss/no-packages.nix
new file mode 100644
index 000000000..62c1d1077
--- /dev/null
+++ b/tests/modules/programs/discocss/no-packages.nix
@@ -0,0 +1,34 @@
+{
+  config = {
+    programs.discocss = {
+      enable = true;
+      package = null;
+      discordPackage = null;
+      discordAlias = false;
+
+      css = ''
+        /* Custom Discord theme */
+        .theme-dark {
+          --background-primary: #2f3136;
+          --background-secondary: #36393f;
+        }
+
+        .chat-3bRxxu {
+          background: var(--background-primary);
+        }
+
+        .content-yTz4x3:before {
+          content: "Custom CSS Loaded";
+          color: #43b581;
+        }
+      '';
+    };
+
+    nmt.script = ''
+      assertFileExists home-files/.config/discocss/custom.css
+      assertFileContent \
+        home-files/.config/discocss/custom.css \
+        ${./with-custom-css-expected.css}
+    '';
+  };
+}
diff --git a/tests/modules/programs/discocss/with-custom-css-expected.css b/tests/modules/programs/discocss/with-custom-css-expected.css
new file mode 100644
index 000000000..6f1f0d5e8
--- /dev/null
+++ b/tests/modules/programs/discocss/with-custom-css-expected.css
@@ -0,0 +1,14 @@
+/* Custom Discord theme */
+.theme-dark {
+  --background-primary: #2f3136;
+  --background-secondary: #36393f;
+}
+
+.chat-3bRxxu {
+  background: var(--background-primary);
+}
+
+.content-yTz4x3:before {
+  content: "Custom CSS Loaded";
+  color: #43b581;
+}