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frontend/tests/pluginConfigDraft.test.ts

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+import { describe, expect, test } from 'vitest';
+import {
+  buildPluginConfigDraft,
+  buildPluginConfigPatch,
+} from '../src/features/plugins/pluginConfigDraft';
+import type { PluginConfigField } from '../src/types';
+
+const fields: PluginConfigField[] = [
+  { name: 'mixed', type: 'array', enumValues: [], description: '' },
+  { name: 'optional', type: 'boolean', enumValues: [], description: '' },
+  { name: 'label', type: 'string', enumValues: [], description: '' },
+];
+
+const t = (key: string) => key;
+
+describe('plugin config draft', () => {
+  test('represents arrays as JSON without marking missing booleans as touched', () => {
+    const draft = buildPluginConfigDraft(
+      { enabled: true, configFields: fields },
+      { priority: 3, mixed: [1, true, { x: 1 }] }
+    );
+
+    expect(draft.values.mixed).toBe('[\n  1,\n  true,\n  {\n    "x": 1\n  }\n]');
+    expect(draft.values.optional).toBe(false);
+    expect(draft.touchedFields).toEqual({});
+  });
+
+  test('only patches touched base fields and preserves untouched plugin values', () => {
+    const draft = buildPluginConfigDraft(
+      { enabled: true, configFields: fields },
+      { priority: 3, mixed: [1, true, { x: 1 }] }
+    );
+    draft.priority = '5';
+    draft.priorityTouched = true;
+
+    expect(buildPluginConfigPatch(draft, fields, t)).toEqual({
+      patch: { priority: 5 },
+      errors: {},
+    });
+  });
+
+  test('parses touched array JSON without coercing item types', () => {
+    const draft = buildPluginConfigDraft(
+      { enabled: true, configFields: fields },
+      { mixed: ['old'] }
+    );
+    draft.values.mixed = '[1, false, {"next": 2}]';
+    draft.touchedFields.mixed = true;
+
+    expect(buildPluginConfigPatch(draft, fields, t)).toEqual({
+      patch: { mixed: [1, false, { next: 2 }] },
+      errors: {},
+    });
+  });
+
+  test('writes a missing boolean only after the user touches it', () => {
+    const draft = buildPluginConfigDraft({ enabled: true, configFields: fields }, {});
+    draft.touchedFields.optional = true;
+
+    expect(buildPluginConfigPatch(draft, fields, t)).toEqual({
+      patch: { optional: false },
+      errors: {},
+    });
+  });
+
+  test('deletes a cleared touched field with null', () => {
+    const draft = buildPluginConfigDraft(
+      { enabled: true, configFields: fields },
+      { label: 'keep me' }
+    );
+    draft.values.label = '   ';
+    draft.touchedFields.label = true;
+
+    expect(buildPluginConfigPatch(draft, fields, t)).toEqual({
+      patch: { label: null },
+      errors: {},
+    });
+  });
+
+  test('rejects non-array JSON for an array field', () => {
+    const draft = buildPluginConfigDraft(
+      { enabled: true, configFields: fields },
+      { mixed: ['old'] }
+    );
+    draft.values.mixed = '{"not":"an array"}';
+    draft.touchedFields.mixed = true;
+
+    expect(buildPluginConfigPatch(draft, fields, t)).toEqual({
+      patch: {},
+      errors: { mixed: 'plugin_management.expected_array' },
+    });
+  });
+});