test: add tests for relation ops

src/core/relation.test.ts

@@ -0,0 +1,50 @@
+import { expect, it } from 'vitest';
+import { make, remove, reorder } from './relation.js';
+import { Position, PositionRange } from './position.js';
+import { RELATION_INDEX } from './ids/system.js';
+
+it('should generate CreateRelationOp for CREATE_RELATION', () => {
+  const op = make({
+    relationId: 'test-relation-id',
+    fromId: 'test-entity-id',
+    relationTypeId: 'test-relation-type-id',
+    toId: 'test-entity-id',
+    position: 'test-position',
+  });
+
+  expect(op).toEqual({
+    type: 'CREATE_RELATION',
+    relation: {
+      id: 'test-relation-id',
+      type: 'test-relation-type-id',
+      fromEntity: 'test-entity-id',
+      toEntity: 'test-entity-id',
+      index: 'test-position',
+    },
+  });
+});
+
+it('should generate DeleteRelationOp for DELETE_RELATION', () => {
+  const op = remove('test-relation-id');
+
+  expect(op).toEqual({
+    type: 'DELETE_RELATION',
+    relation: {
+      id: 'test-relation-id',
+    },
+  });
+});
+
+it('should generate Op that places the fractional indexer between the two provided values', () => {
+  const op = reorder({
+    relationId: 'test-relation-id',
+    beforeIndex: PositionRange.FIRST,
+    afterIndex: PositionRange.LAST,
+  });
+
+  expect(op.type).toBe('SET_TRIPLE');
+  expect(op.triple.attribute).toBe(RELATION_INDEX);
+  expect(op.triple.entity).toBe('test-relation-id');
+  expect(op.triple.value.type).toBe('TEXT');
+  // @TODO how do we test that the resulting value is in-between the two indexes?
+});