Add drag-to-trash exhibit disposal

src/boardDomain.test.ts

@@ -5,6 +5,7 @@ import {
   MIN_BOARD_ZOOM,
   clampBoardZoom,
   containedIds,
+  discardExhibit,
   folderIsOpen,
   moveBoardPoint,
   nextOpenBoardPosition,
@@ -185,3 +186,27 @@ describe('folder domain behavior', () => {
     expect(normalized.relations).toHaveLength(1)
   })
 })
+
+describe('exhibit disposal', () => {
+  it('removes an exhibit and every graph reference while retaining source documents', () => {
+    const note = { ...folder, id: 'note-1', type: 'note' as const, title: 'Working note' }
+    const event = { ...folder, id: 'event-1', type: 'event' as const, supportingEvidenceIds: [note.id, 'doc-1'] }
+    const party = { ...folder, id: 'party-1', type: 'party' as const, relatedEvidenceIds: [note.id] }
+    const discarded = discardExhibit({
+      ...state,
+      documents: [{ id: 'doc-1', title: 'Source', kind: 'TEXT', date: '', body: [], regions: [], fileType: 'text', metadata: {} }],
+      evidence: [folder, note, event, party],
+      relations: [{ id: 'nested', fromWidgetId: folder.id, toWidgetId: note.id, type: 'contains' }],
+      connections: [{ id: 'thread', fromEvidenceId: note.id, toEvidenceId: party.id }],
+      brief: { body: '', concepts: [{ id: 'concept-1', label: 'Unknown', context: '', resolvedPartyExhibitId: note.id }] },
+    }, note.id)
+
+    expect(discarded.documents).toHaveLength(1)
+    expect(discarded.evidence.map(exhibit => exhibit.id)).not.toContain(note.id)
+    expect(discarded.relations).toEqual([])
+    expect(discarded.connections).toEqual([])
+    expect(discarded.evidence.find(exhibit => exhibit.id === event.id)?.supportingEvidenceIds).toEqual(['doc-1'])
+    expect(discarded.evidence.find(exhibit => exhibit.id === party.id)?.relatedEvidenceIds).toEqual([])
+    expect(discarded.brief.concepts[0].resolvedPartyExhibitId).toBeUndefined()
+  })
+})