diff --git a/test/unit/clitests.json b/test/unit/clitests.json
index ce261c249..2033ddd7a 100644
--- a/test/unit/clitests.json
+++ b/test/unit/clitests.json
@@ -48,6 +48,7 @@
     "pdf_viewer_spec.js",
     "postscript_spec.js",
     "primitives_spec.js",
+    "scripting_utils_spec.js",
     "stream_spec.js",
     "string_utils_spec.js",
     "struct_tree_spec.js",
diff --git a/test/unit/jasmine-boot.js b/test/unit/jasmine-boot.js
index fbbc7730e..ea6404f9a 100644
--- a/test/unit/jasmine-boot.js
+++ b/test/unit/jasmine-boot.js
@@ -95,6 +95,7 @@ async function initializePDFJS(callback) {
       "pdfjs-test/unit/postscript_spec.js",
       "pdfjs-test/unit/primitives_spec.js",
       "pdfjs-test/unit/scripting_spec.js",
+      "pdfjs-test/unit/scripting_utils_spec.js",
       "pdfjs-test/unit/stream_spec.js",
       "pdfjs-test/unit/string_utils_spec.js",
       "pdfjs-test/unit/struct_tree_spec.js",
diff --git a/test/unit/scripting_utils_spec.js b/test/unit/scripting_utils_spec.js
new file mode 100644
index 000000000..efc3cc0ba
--- /dev/null
+++ b/test/unit/scripting_utils_spec.js
@@ -0,0 +1,70 @@
+/* Copyright 2026 Mozilla Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { ColorConverters } from "../../src/shared/scripting_utils.js";
+
+describe("scripting_utils", function () {
+  describe("ColorConverters", function () {
+    it("should check G conversion", function () {
+      const color = [0.5];
+
+      expect(ColorConverters.G_CMYK(color)).toEqual(["CMYK", 0, 0, 0, 0.5]);
+
+      expect(ColorConverters.G_RGB(color)).toEqual(["RGB", 0.5, 0.5, 0.5]);
+
+      expect(ColorConverters.G_rgb(color)).toEqual([127.5, 127.5, 127.5]);
+
+      expect(ColorConverters.G_HTML(color)).toEqual("#7f7f7f");
+    });
+
+    it("should check RGB conversion", function () {
+      const color = [0.4, 0.5, 0.6];
+
+      expect(ColorConverters.RGB_CMYK(color)).toEqual([
+        "CMYK",
+        0.6,
+        0.5,
+        0.4,
+        0.4,
+      ]);
+
+      expect(ColorConverters.RGB_G(color)).toEqual(["G", 0.481]);
+
+      expect(ColorConverters.RGB_rgb(color)).toEqual([102, 127.5, 153]);
+
+      expect(ColorConverters.RGB_HTML(color)).toEqual("#667f99");
+    });
+
+    it("should check CMYK conversion", function () {
+      const color = [0.4, 0.5, 0.6, 0];
+
+      expect(ColorConverters.CMYK_RGB(color)).toEqual(["RGB", 0.6, 0.4, 0.5]);
+
+      expect(ColorConverters.CMYK_G(color)).toEqual(["G", 0.471]);
+
+      expect(ColorConverters.CMYK_rgb(color)).toEqual([153, 102, 127.5]);
+
+      expect(ColorConverters.CMYK_HTML(color)).toEqual("#99667f");
+    });
+
+    it("should check T conversion", function () {
+      const color = [0.4, 0.5, 0.6];
+
+      expect(ColorConverters.T_rgb(color)).toEqual([null]);
+
+      expect(ColorConverters.T_HTML(color)).toEqual("#00000000");
+    });
+  });
+});