diff --git a/specifyweb/frontend/js_src/lib/components/WbPlanView/__tests__/mappingReducer.test.ts b/specifyweb/frontend/js_src/lib/components/WbPlanView/__tests__/mappingReducer.test.ts
new file mode 100644
index 00000000000..c8d563e5cfb
--- /dev/null
+++ b/specifyweb/frontend/js_src/lib/components/WbPlanView/__tests__/mappingReducer.test.ts
@@ -0,0 +1,36 @@
+import { requireContext } from '../../../tests/helpers';
+import { defaultColumnOptions } from '../linesGetter';
+import { getDefaultMappingState } from '../Mapper';
+import { emptyMapping } from '../mappingHelpers';
+import { reducer } from '../mappingReducer';
+
+requireContext();
+
+// [WorkBench] Select a field mapping in the Data Mapper
+test('selects a field mapping', () => {
+  const state = getDefaultMappingState({
+    changesMade: false,
+    lines: [
+      {
+        headerName: 'Catalog Number',
+        mappingPath: [emptyMapping],
+        columnOptions: defaultColumnOptions,
+      },
+    ],
+    mustMatchPreferences: {},
+  });
+
+  const updatedState = reducer(state, {
+    type: 'ChangeSelectElementValueAction',
+    line: 0,
+    index: 0,
+    newValue: 'catalogNumber',
+    isRelationship: false,
+    parentTableName: 'CollectionObject',
+    newTableName: undefined,
+    currentTableName: undefined,
+  });
+
+  expect(updatedState.lines[0].mappingPath).toEqual(['catalogNumber']);
+  expect(updatedState.changesMade).toBe(true);
+});