feat: empty store

.changeset/cool-tools-yell.md

@@ -0,0 +1,5 @@
+---
+"mocha-chai-rdf": patch
+---
+
+Changed the type of `this.rdf.dataset`

.changeset/wicked-rice-juggle.md

@@ -0,0 +1,5 @@
+---
+"mocha-chai-rdf": patch
+---
+
+Added `createEmpty` function to `store.js`

README.md

@@ -105,3 +105,15 @@ You can customize the options:
 - include the default graph by adding `includeDefaultGraph: true`
 - load all graphs by adding `loadAll: true`
 - control the graph name by adding `sliceTestPath: [number, number]`. The default is `[1, -1]` which, as described above, omits the topmost `describe` block name and the test name itself, hence the first and last part are sliced from the array of block titles.
+
+### Initialise empty store
+
+In case you'd only want to initialise an empty store:
+
+```ts
+import { createEmpty } from 'mocha-chai-rdf/store.js'
+
+describe('my test suite', () => {
+  beforeEach(createEmpty)
+})
+```

lib/store.ts

@@ -4,7 +4,7 @@ import assert from 'node:assert'
 import * as Oxigraph from 'oxigraph'
 import type { NamespaceBuilder } from '@rdfjs/namespace'
 import rdf from '@zazuko/env-node'
-import type { DatasetCore, NamedNode, Quad_Graph } from '@rdfjs/types'
+import type { NamedNode, Quad_Graph } from '@rdfjs/types'
 import type { AnyPointer } from 'clownface'
 import type { Dataset } from '@zazuko/env/lib/Dataset.js'
 import type { StreamClient } from 'sparql-http-client/StreamClient.js'
@@ -14,7 +14,7 @@ import * as clients from './sparql-clients.js'
 declare module 'mocha' {
   interface Context {
     rdf: {
-      dataset: DatasetCore
+      dataset: Dataset
       graph: AnyPointer
       store: Oxigraph.Store
       streamClient: StreamClient
@@ -38,6 +38,31 @@ type Options = (DatasetSourceOptions | GraphSourceOptions) & {
   sliceTestPath?: [number, number]
 }
 
+export function createEmpty(this: Mocha.Context) {
+  const store = new Oxigraph.Store()
+
+  const rdfFixture = {
+    dataset: rdf.dataset(),
+    graph: rdf.clownface({ dataset: rdf.dataset() }),
+    store,
+    streamClient: clients.streamClient(store),
+    parsingClient: clients.parsingClient(store),
+  }
+
+  Object.defineProperty(this, 'rdf', {
+    get() {
+      return rdfFixture
+    },
+    configurable: true,
+  })
+
+  afterEach(() => {
+    /* eslint-disable @typescript-eslint/ban-ts-comment */
+    // @ts-ignore
+    delete this.rdf
+  })
+}
+
 export function createStore(base: string, { sliceTestPath = [1, -1], ...options }: Options = { }) {
   const baseIRI: string | undefined = typeof options.baseIri === 'string'
     ? options.baseIri

test/tests/store.ts

@@ -1,6 +1,6 @@
 import { expect } from 'chai'
 import rdf from '@zazuko/env-node'
-import { createStore } from '../../lib/store.js'
+import { createEmpty, createStore } from '../../lib/store.js'
 
 describe('store.js', () => {
   describe('createStore', () => {
@@ -63,4 +63,20 @@ describe('store.js', () => {
       })
     })
   })
+
+  describe('createEmpty', () => {
+    before(createEmpty)
+
+    it('initializes empty dataset', function () {
+      expect(this.rdf.dataset).to.have.property('size', 0)
+    })
+
+    it('provides access properties', function () {
+      expect(this.rdf).to.have.property('graph')
+      expect(this.rdf).to.have.property('dataset')
+      expect(this.rdf).to.have.property('store')
+      expect(this.rdf).to.have.property('streamClient')
+      expect(this.rdf).to.have.property('parsingClient')
+    })
+  })
 })