diff --git a/common/web/types/test/util/test-file-types.ts b/common/web/types/test/util/test-file-types.ts
index 929cf22cee..962f69955b 100644
--- a/common/web/types/test/util/test-file-types.ts
+++ b/common/web/types/test/util/test-file-types.ts
@@ -8,21 +8,25 @@
 
 import 'mocha';
 import { assert } from 'chai';
-import { removeExtension } from '../../src/util/file-types.js';
-
-const sourceExts = [ // can't use Source, as it is const enum
-  '.model.ts',
-  '.kpj',
-  '.kmn',
-  '.xml',
-  '.kvks',
-  '.keyman-touch-layout',
-];
+import {
+  ALL,
+  ALL_SOURCE,
+  ALL_BINARY,
+  removeExtension,
+  sourceOrBinaryTypeFromFilename
+} from '../../src/util/file-types.js';
 
 describe('Test of File-Types', () => {
   describe('Test of removeExtension()', () => {
     it('can remove Source file extension', () => {
-      sourceExts.forEach((ext) => {
+      ALL_SOURCE.forEach((ext) => {
+        const filename = `file${ext}`;
+        const actual   = removeExtension(filename);
+        assert.deepEqual(actual, "file");
+      });
+    });
+    it('can remove Binary file extension', () => {
+      ALL_BINARY.forEach((ext) => {
         const filename = `file${ext}`;
         const actual   = removeExtension(filename);
         assert.deepEqual(actual, "file");
@@ -33,4 +37,34 @@ describe('Test of File-Types', () => {
       assert.deepEqual(filename, "file");
     });
   });
+  describe('Test of sourceOrBinaryTypeFromFilename()', () => {
+    it('can extract Source file extension', () => {
+      ALL_SOURCE.forEach((ext) => {
+        const filename = `file${ext}`;
+        const actual   = sourceOrBinaryTypeFromFilename(filename);
+        assert.deepEqual(actual, ext);
+      });
+    });
+    it('can extract Binary file extension', () => {
+      ALL_BINARY.forEach((ext) => {
+        const filename = `file${ext}`;
+        const actual   = sourceOrBinaryTypeFromFilename(filename);
+        assert.deepEqual(actual, ext);
+      });
+    });
+    it('returns null for unmatched file extension', () => {
+      const ext = ".cpp";
+      assert.isFalse((Object.values(ALL) as string[]).includes(ext));
+      const filename = `file${ext}`;
+      const actual   = sourceOrBinaryTypeFromFilename(filename);
+      assert.isNull(actual);
+    });
+    it('can extract upper case file extension', () => {
+      const ext          = ALL[0];
+      const upperCaseExt = ext.toUpperCase();
+      const filename     = `file${upperCaseExt}`;
+      const actual       = sourceOrBinaryTypeFromFilename(filename);
+      assert.deepEqual(actual, ext);
+    });
+  });
 });
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