From 4404fa07d9238aed2afdce29e3a3d1eafed6af0b Mon Sep 17 00:00:00 2001
From: Joachim Van Herwegen <joachimvh@gmail.com>
Date: Wed, 23 Feb 2022 15:41:31 +0100
Subject: [PATCH] refactor: Rename resourceExists to hasResource

The function was also moved to the smaller interface ResourceSet.
---
 RELEASE_NOTES.md                                   |  2 ++
 src/http/ldp/PatchOperationHandler.ts              |  2 +-
 src/http/ldp/PutOperationHandler.ts                |  2 +-
 src/index.ts                                       |  1 +
 src/pods/GeneratedPodManager.ts                    |  2 +-
 src/storage/BaseResourceStore.ts                   |  2 +-
 src/storage/DataAccessorBasedStore.ts              |  4 ++--
 src/storage/LockingResourceStore.ts                |  4 ++--
 src/storage/MonitoringStore.ts                     |  4 ++--
 src/storage/PassthroughStore.ts                    |  4 ++--
 src/storage/ResourceSet.ts                         | 14 ++++++++++++++
 src/storage/ResourceStore.ts                       | 12 ++----------
 src/storage/RoutingResourceStore.ts                |  4 ++--
 src/storage/keyvalue/JsonResourceStorage.ts        |  2 +-
 src/storage/routing/ConvertingRouterRule.ts        |  2 +-
 test/unit/http/ldp/PatchOperationHandler.test.ts   |  4 ++--
 test/unit/http/ldp/PutOperationHandler.test.ts     |  4 ++--
 test/unit/pods/GeneratedPodManager.test.ts         |  6 +++---
 test/unit/storage/BaseResourceStore.test.ts        |  4 ++--
 test/unit/storage/DataAccessorBasedStore.test.ts   |  6 +++---
 test/unit/storage/LockingResourceStore.test.ts     | 12 ++++++------
 test/unit/storage/MonitoringStore.test.ts          | 10 +++++-----
 test/unit/storage/PassthroughStore.test.ts         | 10 +++++-----
 test/unit/storage/RoutingResourceStore.test.ts     | 10 +++++-----
 .../storage/keyvalue/JsonResourceStorage.test.ts   |  2 +-
 .../storage/routing/ConvertingRouterRule.test.ts   |  8 ++++----
 26 files changed, 73 insertions(+), 64 deletions(-)
 create mode 100644 src/storage/ResourceSet.ts

diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 66749ddee2..28173cf82d 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -21,6 +21,8 @@ The following changes are relevant for v3 custom configs that replaced certain f
 These changes are relevant if you wrote custom modules for the server that depend on existing interfaces.
 - The output of `parseContentType` in `HeaderUtil` was changed to include parameters.
 - `PermissionReader`s take an additional `modes` parameter as input.
+- The `ResourceStore` function `resourceExists` has been renamed to `hasResource`
+  and has been moved to a separate `ResourceSet` interface.
 
 ## v3.0.0
 ### New features
diff --git a/src/http/ldp/PatchOperationHandler.ts b/src/http/ldp/PatchOperationHandler.ts
index e17a3da6df..04d0844e05 100644
--- a/src/http/ldp/PatchOperationHandler.ts
+++ b/src/http/ldp/PatchOperationHandler.ts
@@ -42,7 +42,7 @@ export class PatchOperationHandler extends OperationHandler {
     // RFC7231, §4.3.4: If the target resource does not have a current representation and the
     //   PUT successfully creates one, then the origin server MUST inform the
     //   user agent by sending a 201 (Created) response.
-    const exists = await this.store.resourceExists(operation.target, operation.conditions);
+    const exists = await this.store.hasResource(operation.target);
     await this.store.modifyResource(operation.target, operation.body as Patch, operation.conditions);
     if (exists) {
       return new ResetResponseDescription();
diff --git a/src/http/ldp/PutOperationHandler.ts b/src/http/ldp/PutOperationHandler.ts
index deb25c2218..eacee16f86 100644
--- a/src/http/ldp/PutOperationHandler.ts
+++ b/src/http/ldp/PutOperationHandler.ts
@@ -38,7 +38,7 @@ export class PutOperationHandler extends OperationHandler {
     }
     // A more efficient approach would be to have the server return metadata indicating if a resource was new
     // See https://github.com/solid/community-server/issues/632
-    const exists = await this.store.resourceExists(operation.target, operation.conditions);
+    const exists = await this.store.hasResource(operation.target);
     await this.store.setRepresentation(operation.target, operation.body, operation.conditions);
     if (exists) {
       return new ResetResponseDescription();
diff --git a/src/index.ts b/src/index.ts
index 8a8830fdc3..51bc27da28 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -358,6 +358,7 @@ export * from './storage/PassthroughStore';
 export * from './storage/PatchingStore';
 export * from './storage/ReadOnlyStore';
 export * from './storage/RepresentationConvertingStore';
+export * from './storage/ResourceSet';
 export * from './storage/ResourceStore';
 export * from './storage/RoutingResourceStore';
 
diff --git a/src/pods/GeneratedPodManager.ts b/src/pods/GeneratedPodManager.ts
index 076ab75d0b..2b3971de66 100644
--- a/src/pods/GeneratedPodManager.ts
+++ b/src/pods/GeneratedPodManager.ts
@@ -28,7 +28,7 @@ export class GeneratedPodManager implements PodManager {
    */
   public async createPod(identifier: ResourceIdentifier, settings: PodSettings, overwrite: boolean): Promise<void> {
     this.logger.info(`Creating pod ${identifier.path}`);
-    if (!overwrite && await this.store.resourceExists(identifier)) {
+    if (!overwrite && await this.store.hasResource(identifier)) {
       throw new ConflictHttpError(`There already is a resource at ${identifier.path}`);
     }
 
diff --git a/src/storage/BaseResourceStore.ts b/src/storage/BaseResourceStore.ts
index a6fea66630..16c208e8e9 100644
--- a/src/storage/BaseResourceStore.ts
+++ b/src/storage/BaseResourceStore.ts
@@ -11,7 +11,7 @@ import type { ResourceStore } from './ResourceStore';
  */
 /* eslint-disable @typescript-eslint/no-unused-vars */
 export class BaseResourceStore implements ResourceStore {
-  public async resourceExists(identifier: ResourceIdentifier, conditions?: Conditions): Promise<boolean> {
+  public async hasResource(identifier: ResourceIdentifier): Promise<boolean> {
     throw new NotImplementedHttpError();
   }
 
diff --git a/src/storage/DataAccessorBasedStore.ts b/src/storage/DataAccessorBasedStore.ts
index 570e9c6744..451fde55f4 100644
--- a/src/storage/DataAccessorBasedStore.ts
+++ b/src/storage/DataAccessorBasedStore.ts
@@ -81,7 +81,7 @@ export class DataAccessorBasedStore implements ResourceStore {
     this.auxiliaryStrategy = auxiliaryStrategy;
   }
 
-  public async resourceExists(identifier: ResourceIdentifier): Promise<boolean> {
+  public async hasResource(identifier: ResourceIdentifier): Promise<boolean> {
     try {
       this.validateIdentifier(identifier);
       await this.accessor.getMetadata(identifier);
@@ -530,7 +530,7 @@ export class DataAccessorBasedStore implements ResourceStore {
     // Make sure we don't already have a resource with this exact name (or with differing trailing slash)
     const withSlash = { path: ensureTrailingSlash(newID.path) };
     const withoutSlash = { path: trimTrailingSlashes(newID.path) };
-    if (await this.resourceExists(withSlash) || await this.resourceExists(withoutSlash)) {
+    if (await this.hasResource(withSlash) || await this.hasResource(withoutSlash)) {
       newID = this.createURI(container, isContainer);
     }
 
diff --git a/src/storage/LockingResourceStore.ts b/src/storage/LockingResourceStore.ts
index a8740534ca..ae004ea413 100644
--- a/src/storage/LockingResourceStore.ts
+++ b/src/storage/LockingResourceStore.ts
@@ -34,9 +34,9 @@ export class LockingResourceStore implements AtomicResourceStore {
     this.auxiliaryStrategy = auxiliaryStrategy;
   }
 
-  public async resourceExists(identifier: ResourceIdentifier, conditions?: Conditions): Promise<boolean> {
+  public async hasResource(identifier: ResourceIdentifier): Promise<boolean> {
     return this.locks.withReadLock(this.getLockIdentifier(identifier),
-      async(): Promise<boolean> => this.source.resourceExists(identifier, conditions));
+      async(): Promise<boolean> => this.source.hasResource(identifier));
   }
 
   public async getRepresentation(identifier: ResourceIdentifier, preferences: RepresentationPreferences,
diff --git a/src/storage/MonitoringStore.ts b/src/storage/MonitoringStore.ts
index 307cc2d6d4..d027c5ed81 100644
--- a/src/storage/MonitoringStore.ts
+++ b/src/storage/MonitoringStore.ts
@@ -19,8 +19,8 @@ export class MonitoringStore<T extends ResourceStore = ResourceStore>
     this.source = source;
   }
 
-  public async resourceExists(identifier: ResourceIdentifier, conditions?: Conditions): Promise<boolean> {
-    return this.source.resourceExists(identifier, conditions);
+  public async hasResource(identifier: ResourceIdentifier): Promise<boolean> {
+    return this.source.hasResource(identifier);
   }
 
   public async getRepresentation(identifier: ResourceIdentifier, preferences: RepresentationPreferences,
diff --git a/src/storage/PassthroughStore.ts b/src/storage/PassthroughStore.ts
index 60254b1ad7..6ab9a5fc23 100644
--- a/src/storage/PassthroughStore.ts
+++ b/src/storage/PassthroughStore.ts
@@ -17,8 +17,8 @@ export class PassthroughStore<T extends ResourceStore = ResourceStore> implement
     this.source = source;
   }
 
-  public async resourceExists(identifier: ResourceIdentifier, conditions?: Conditions): Promise<boolean> {
-    return this.source.resourceExists(identifier, conditions);
+  public async hasResource(identifier: ResourceIdentifier): Promise<boolean> {
+    return this.source.hasResource(identifier);
   }
 
   public async getRepresentation(identifier: ResourceIdentifier, preferences: RepresentationPreferences,
diff --git a/src/storage/ResourceSet.ts b/src/storage/ResourceSet.ts
new file mode 100644
index 0000000000..05b8fec73d
--- /dev/null
+++ b/src/storage/ResourceSet.ts
@@ -0,0 +1,14 @@
+import type { ResourceIdentifier } from '../http/representation/ResourceIdentifier';
+
+/**
+ * A set containing resources.
+ */
+export interface ResourceSet {
+  /**
+   * Check if a resource exists in this ResourceSet.
+   * @param identifier - Identifier of resource to check.
+   *
+   * @returns A promise resolving if the resource already exists.
+   */
+  hasResource: (identifier: ResourceIdentifier) => Promise<boolean>;
+}
diff --git a/src/storage/ResourceStore.ts b/src/storage/ResourceStore.ts
index 581cfd2039..57bec1f30f 100644
--- a/src/storage/ResourceStore.ts
+++ b/src/storage/ResourceStore.ts
@@ -3,6 +3,7 @@ import type { Representation } from '../http/representation/Representation';
 import type { RepresentationPreferences } from '../http/representation/RepresentationPreferences';
 import type { ResourceIdentifier } from '../http/representation/ResourceIdentifier';
 import type { Conditions } from './Conditions';
+import type { ResourceSet } from './ResourceSet';
 
 /**
  * A ResourceStore represents a collection of resources.
@@ -15,16 +16,7 @@ import type { Conditions } from './Conditions';
  * ResourceStores are also responsible for taking auxiliary resources into account
  * should those be relevant to the store.
  */
-export interface ResourceStore {
-
-  /**
-   * Check if a resource exists.
-   * @param identifier - Identifier of resource to check.
-   *
-   * @returns A promise resolving if the resource already exists
-   */
-  resourceExists: (identifier: ResourceIdentifier, conditions?: Conditions) => Promise<boolean>;
-
+export interface ResourceStore extends ResourceSet {
   /**
    * Retrieves a representation of a resource.
    * @param identifier - Identifier of the resource to read.
diff --git a/src/storage/RoutingResourceStore.ts b/src/storage/RoutingResourceStore.ts
index c09899c6a5..0cba64bee0 100644
--- a/src/storage/RoutingResourceStore.ts
+++ b/src/storage/RoutingResourceStore.ts
@@ -20,9 +20,9 @@ export class RoutingResourceStore implements ResourceStore {
     this.rule = rule;
   }
 
-  public async resourceExists(identifier: ResourceIdentifier, conditions?: Conditions):
+  public async hasResource(identifier: ResourceIdentifier):
   Promise<boolean> {
-    return (await this.getStore(identifier)).resourceExists(identifier, conditions);
+    return (await this.getStore(identifier)).hasResource(identifier);
   }
 
   public async getRepresentation(identifier: ResourceIdentifier, preferences: RepresentationPreferences,
diff --git a/src/storage/keyvalue/JsonResourceStorage.ts b/src/storage/keyvalue/JsonResourceStorage.ts
index 794df82e4c..8e7ea7bf18 100644
--- a/src/storage/keyvalue/JsonResourceStorage.ts
+++ b/src/storage/keyvalue/JsonResourceStorage.ts
@@ -42,7 +42,7 @@ export class JsonResourceStorage implements KeyValueStorage<string, unknown> {
 
   public async has(key: string): Promise<boolean> {
     const identifier = this.createIdentifier(key);
-    return await this.source.resourceExists(identifier);
+    return await this.source.hasResource(identifier);
   }
 
   public async set(key: string, value: unknown): Promise<this> {
diff --git a/src/storage/routing/ConvertingRouterRule.ts b/src/storage/routing/ConvertingRouterRule.ts
index d9b37a752d..404896ccda 100644
--- a/src/storage/routing/ConvertingRouterRule.ts
+++ b/src/storage/routing/ConvertingRouterRule.ts
@@ -39,7 +39,7 @@ export class ConvertingRouterRule extends RouterRule {
         entry.supportChecker.supports({ identifier, representation }));
     } else {
       // No content-type given so we can only check if one of the stores has data for the identifier
-      store = await this.findStore(async(entry): Promise<boolean> => entry.store.resourceExists(identifier));
+      store = await this.findStore(async(entry): Promise<boolean> => entry.store.hasResource(identifier));
     }
     return store;
   }
diff --git a/test/unit/http/ldp/PatchOperationHandler.test.ts b/test/unit/http/ldp/PatchOperationHandler.test.ts
index 4bbd6b6108..fda18dcacc 100644
--- a/test/unit/http/ldp/PatchOperationHandler.test.ts
+++ b/test/unit/http/ldp/PatchOperationHandler.test.ts
@@ -19,7 +19,7 @@ describe('A PatchOperationHandler', (): void => {
     operation = { method: 'PATCH', target: { path: 'http://test.com/foo' }, body, conditions, preferences: {}};
 
     store = {
-      resourceExists: jest.fn(),
+      hasResource: jest.fn(),
       modifyResource: jest.fn(),
     } as any;
 
@@ -47,7 +47,7 @@ describe('A PatchOperationHandler', (): void => {
   });
 
   it('returns the correct response if the resource already exists.', async(): Promise<void> => {
-    store.resourceExists.mockResolvedValueOnce(true);
+    store.hasResource.mockResolvedValueOnce(true);
     const result = await handler.handle({ operation });
     expect(store.modifyResource).toHaveBeenCalledTimes(1);
     expect(store.modifyResource).toHaveBeenLastCalledWith(operation.target, body, conditions);
diff --git a/test/unit/http/ldp/PutOperationHandler.test.ts b/test/unit/http/ldp/PutOperationHandler.test.ts
index 09f70a0851..a4b00c9174 100644
--- a/test/unit/http/ldp/PutOperationHandler.test.ts
+++ b/test/unit/http/ldp/PutOperationHandler.test.ts
@@ -18,7 +18,7 @@ describe('A PutOperationHandler', (): void => {
     body = new BasicRepresentation('', 'text/turtle');
     operation = { method: 'PUT', target: { path: 'http://test.com/foo' }, body, conditions, preferences: {}};
     store = {
-      resourceExists: jest.fn(),
+      hasResource: jest.fn(),
       setRepresentation: jest.fn(),
     } as any;
 
@@ -46,7 +46,7 @@ describe('A PutOperationHandler', (): void => {
   });
 
   it('returns the correct response if the resource already exists.', async(): Promise<void> => {
-    store.resourceExists.mockResolvedValueOnce(true);
+    store.hasResource.mockResolvedValueOnce(true);
     const result = await handler.handle({ operation });
     expect(store.setRepresentation).toHaveBeenCalledTimes(1);
     expect(store.setRepresentation).toHaveBeenLastCalledWith(operation.target, body, conditions);
diff --git a/test/unit/pods/GeneratedPodManager.test.ts b/test/unit/pods/GeneratedPodManager.test.ts
index 6d1f53b812..1bd241ecbd 100644
--- a/test/unit/pods/GeneratedPodManager.test.ts
+++ b/test/unit/pods/GeneratedPodManager.test.ts
@@ -20,7 +20,7 @@ describe('A GeneratedPodManager', (): void => {
     };
     store = {
       setRepresentation: jest.fn(),
-      resourceExists: jest.fn(),
+      hasResource: jest.fn(),
     } as any;
     generatorData = [
       { identifier: { path: '/path/' }, representation: '/' as any },
@@ -36,7 +36,7 @@ describe('A GeneratedPodManager', (): void => {
   });
 
   it('throws an error if the generate identifier is not available.', async(): Promise<void> => {
-    store.resourceExists.mockResolvedValueOnce(true);
+    store.hasResource.mockResolvedValueOnce(true);
     const result = manager.createPod({ path: `${base}user/` }, settings, false);
     await expect(result).rejects.toThrow(`There already is a resource at ${base}user/`);
     await expect(result).rejects.toThrow(ConflictHttpError);
@@ -52,7 +52,7 @@ describe('A GeneratedPodManager', (): void => {
   });
 
   it('allows overwriting when enabled.', async(): Promise<void> => {
-    store.resourceExists.mockResolvedValueOnce(true);
+    store.hasResource.mockResolvedValueOnce(true);
     await expect(manager.createPod({ path: `${base}${settings.login}/` }, settings, true)).resolves.toBeUndefined();
 
     expect(store.setRepresentation).toHaveBeenCalledTimes(3);
diff --git a/test/unit/storage/BaseResourceStore.test.ts b/test/unit/storage/BaseResourceStore.test.ts
index 30a6746c49..ba9b3fc813 100644
--- a/test/unit/storage/BaseResourceStore.test.ts
+++ b/test/unit/storage/BaseResourceStore.test.ts
@@ -25,7 +25,7 @@ describe('A BaseResourceStore', (): void => {
     await expect(store.modifyResource(any, any)).rejects.toThrow(NotImplementedHttpError);
   });
 
-  it('errors on resourceExists.', async(): Promise<void> => {
-    await expect(store.resourceExists(any)).rejects.toThrow(NotImplementedHttpError);
+  it('errors on hasResource.', async(): Promise<void> => {
+    await expect(store.hasResource(any)).rejects.toThrow(NotImplementedHttpError);
   });
 });
diff --git a/test/unit/storage/DataAccessorBasedStore.test.ts b/test/unit/storage/DataAccessorBasedStore.test.ts
index 69f7abda9b..e610330476 100644
--- a/test/unit/storage/DataAccessorBasedStore.test.ts
+++ b/test/unit/storage/DataAccessorBasedStore.test.ts
@@ -726,13 +726,13 @@ describe('A DataAccessorBasedStore', (): void => {
   describe('resource Exists', (): void => {
     it('should return false when the resource does not exist.', async(): Promise<void> => {
       const resourceID = { path: `${root}resource` };
-      await expect(store.resourceExists(resourceID)).resolves.toBeFalsy();
+      await expect(store.hasResource(resourceID)).resolves.toBeFalsy();
     });
 
     it('should return true when the resource exists.', async(): Promise<void> => {
       const resourceID = { path: `${root}resource` };
       accessor.data[resourceID.path] = representation;
-      await expect(store.resourceExists(resourceID)).resolves.toBeTruthy();
+      await expect(store.hasResource(resourceID)).resolves.toBeTruthy();
     });
 
     it('should rethrow any unexpected errors from validateIdentifier.', async(): Promise<void> => {
@@ -741,7 +741,7 @@ describe('A DataAccessorBasedStore', (): void => {
       accessor.getMetadata = jest.fn(async(): Promise<any> => {
         throw new Error('error');
       });
-      await expect(store.resourceExists(resourceID)).rejects.toThrow('error');
+      await expect(store.hasResource(resourceID)).rejects.toThrow('error');
       accessor.getMetadata = originalMetaData;
     });
   });
diff --git a/test/unit/storage/LockingResourceStore.test.ts b/test/unit/storage/LockingResourceStore.test.ts
index 5182e09c21..eab0329629 100644
--- a/test/unit/storage/LockingResourceStore.test.ts
+++ b/test/unit/storage/LockingResourceStore.test.ts
@@ -39,7 +39,7 @@ describe('A LockingResourceStore', (): void => {
       setRepresentation: jest.fn((): any => addOrder('setRepresentation')),
       deleteResource: jest.fn((): any => addOrder('deleteResource')),
       modifyResource: jest.fn((): any => addOrder('modifyResource')),
-      resourceExists: jest.fn((): any => addOrder('resourceExists')),
+      hasResource: jest.fn((): any => addOrder('hasResource')),
     };
 
     timeoutTrigger = new EventEmitter();
@@ -287,12 +287,12 @@ describe('A LockingResourceStore', (): void => {
     expect(order).toEqual([ 'lock read', 'useless get', 'timeout', 'unlock read' ]);
   });
 
-  it('resourceExists should only acquire and release the read lock.', async(): Promise<void> => {
-    await store.resourceExists(subjectId);
+  it('hasResource should only acquire and release the read lock.', async(): Promise<void> => {
+    await store.hasResource(subjectId);
     expect(locker.withReadLock).toHaveBeenCalledTimes(1);
     expect(locker.withWriteLock).toHaveBeenCalledTimes(0);
-    expect(source.resourceExists).toHaveBeenCalledTimes(1);
-    expect(source.resourceExists).toHaveBeenLastCalledWith(subjectId, undefined);
-    expect(order).toEqual([ 'lock read', 'resourceExists', 'unlock read' ]);
+    expect(source.hasResource).toHaveBeenCalledTimes(1);
+    expect(source.hasResource).toHaveBeenLastCalledWith(subjectId);
+    expect(order).toEqual([ 'lock read', 'hasResource', 'unlock read' ]);
   });
 });
diff --git a/test/unit/storage/MonitoringStore.test.ts b/test/unit/storage/MonitoringStore.test.ts
index 2d22f1a728..d8f32bad70 100644
--- a/test/unit/storage/MonitoringStore.test.ts
+++ b/test/unit/storage/MonitoringStore.test.ts
@@ -19,7 +19,7 @@ describe('A MonitoringStore', (): void => {
       setRepresentation: jest.fn(async(): Promise<any> => modified),
       deleteResource: jest.fn(async(): Promise<any> => modified),
       modifyResource: jest.fn(async(): Promise<any> => modified),
-      resourceExists: jest.fn(async(): Promise<any> => undefined),
+      hasResource: jest.fn(async(): Promise<any> => undefined),
     };
     store = new MonitoringStore(source);
     changedCallback = jest.fn();
@@ -106,9 +106,9 @@ describe('A MonitoringStore', (): void => {
     expect(changedCallback).toHaveBeenCalledWith({ path: 'http://example.org/modified/2' });
   });
 
-  it('calls resourceExists directly from the source.', async(): Promise<void> => {
-    await expect(store.resourceExists({ path: 'http://example.org/foo/bar' })).resolves.toBeUndefined();
-    expect(source.resourceExists).toHaveBeenCalledTimes(1);
-    expect(source.resourceExists).toHaveBeenLastCalledWith({ path: 'http://example.org/foo/bar' }, undefined);
+  it('calls hasResource directly from the source.', async(): Promise<void> => {
+    await expect(store.hasResource({ path: 'http://example.org/foo/bar' })).resolves.toBeUndefined();
+    expect(source.hasResource).toHaveBeenCalledTimes(1);
+    expect(source.hasResource).toHaveBeenLastCalledWith({ path: 'http://example.org/foo/bar' });
   });
 });
diff --git a/test/unit/storage/PassthroughStore.test.ts b/test/unit/storage/PassthroughStore.test.ts
index 4b12ad6b48..715911a94c 100644
--- a/test/unit/storage/PassthroughStore.test.ts
+++ b/test/unit/storage/PassthroughStore.test.ts
@@ -14,7 +14,7 @@ describe('A PassthroughStore', (): void => {
       setRepresentation: jest.fn(async(): Promise<any> => 'set'),
       deleteResource: jest.fn(async(): Promise<any> => 'delete'),
       modifyResource: jest.fn(async(): Promise<any> => 'modify'),
-      resourceExists: jest.fn(async(): Promise<any> => 'exists'),
+      hasResource: jest.fn(async(): Promise<any> => 'exists'),
     };
 
     store = new PassthroughStore(source);
@@ -50,9 +50,9 @@ describe('A PassthroughStore', (): void => {
     expect(source.modifyResource).toHaveBeenLastCalledWith({ path: 'modifyPath' }, {}, undefined);
   });
 
-  it('calls resourceExists directly from the source.', async(): Promise<void> => {
-    await expect(store.resourceExists({ path: 'existsPath' })).resolves.toBe('exists');
-    expect(source.resourceExists).toHaveBeenCalledTimes(1);
-    expect(source.resourceExists).toHaveBeenLastCalledWith({ path: 'existsPath' }, undefined);
+  it('calls hasResource directly from the source.', async(): Promise<void> => {
+    await expect(store.hasResource({ path: 'existsPath' })).resolves.toBe('exists');
+    expect(source.hasResource).toHaveBeenCalledTimes(1);
+    expect(source.hasResource).toHaveBeenLastCalledWith({ path: 'existsPath' });
   });
 });
diff --git a/test/unit/storage/RoutingResourceStore.test.ts b/test/unit/storage/RoutingResourceStore.test.ts
index d93256c328..96185ea76d 100644
--- a/test/unit/storage/RoutingResourceStore.test.ts
+++ b/test/unit/storage/RoutingResourceStore.test.ts
@@ -17,7 +17,7 @@ describe('A RoutingResourceStore', (): void => {
       setRepresentation: jest.fn(),
       modifyResource: jest.fn(),
       deleteResource: jest.fn(),
-      resourceExists: jest.fn(),
+      hasResource: jest.fn(),
     };
 
     rule = new StaticAsyncHandler(true, source);
@@ -60,10 +60,10 @@ describe('A RoutingResourceStore', (): void => {
     expect(source.deleteResource).toHaveBeenLastCalledWith(identifier, 'conditions');
   });
 
-  it('calls resourceExists on the resulting store.', async(): Promise<void> => {
-    await expect(store.resourceExists(identifier)).resolves.toBeUndefined();
-    expect(source.resourceExists).toHaveBeenCalledTimes(1);
-    expect(source.resourceExists).toHaveBeenLastCalledWith(identifier, undefined);
+  it('calls hasResource on the resulting store.', async(): Promise<void> => {
+    await expect(store.hasResource(identifier)).resolves.toBeUndefined();
+    expect(source.hasResource).toHaveBeenCalledTimes(1);
+    expect(source.hasResource).toHaveBeenLastCalledWith(identifier);
   });
 
   it('throws a 404 if there is no body and no store was found.', async(): Promise<void> => {
diff --git a/test/unit/storage/keyvalue/JsonResourceStorage.test.ts b/test/unit/storage/keyvalue/JsonResourceStorage.test.ts
index ffc0a6ad41..6fd7cede74 100644
--- a/test/unit/storage/keyvalue/JsonResourceStorage.test.ts
+++ b/test/unit/storage/keyvalue/JsonResourceStorage.test.ts
@@ -19,7 +19,7 @@ describe('A JsonResourceStorage', (): void => {
   beforeEach(async(): Promise<void> => {
     const data: Record<string, string> = { };
     store = {
-      async resourceExists(identifier: ResourceIdentifier): Promise<boolean> {
+      async hasResource(identifier: ResourceIdentifier): Promise<boolean> {
         return Boolean(data[identifier.path]);
       },
       async getRepresentation(identifier: ResourceIdentifier): Promise<Representation> {
diff --git a/test/unit/storage/routing/ConvertingRouterRule.test.ts b/test/unit/storage/routing/ConvertingRouterRule.test.ts
index 94a49ba798..8833eee6ba 100644
--- a/test/unit/storage/routing/ConvertingRouterRule.test.ts
+++ b/test/unit/storage/routing/ConvertingRouterRule.test.ts
@@ -39,18 +39,18 @@ describe('A ConvertingRouterRule', (): void => {
   });
 
   it('checks if the stores contain the identifier if there is no data.', async(): Promise<void> => {
-    store1.resourceExists = jest.fn().mockImplementationOnce((): any => true);
+    store1.hasResource = jest.fn().mockImplementationOnce((): any => true);
     await expect(rule.handle({ identifier: { path: 'identifier' }})).resolves.toBe(store1);
-    expect(store1.resourceExists).toHaveBeenCalledTimes(1);
+    expect(store1.hasResource).toHaveBeenCalledTimes(1);
   });
 
   it('returns the defaultStore if no other store has the resource.', async(): Promise<void> => {
-    store1.resourceExists = jest.fn().mockImplementationOnce((): any => false);
+    store1.hasResource = jest.fn().mockImplementationOnce((): any => false);
     await expect(rule.handle({ identifier: { path: 'identifier' }})).resolves.toBe(defaultStore);
   });
 
   it('throws the error if a store had a non-404 error.', async(): Promise<void> => {
-    store1.resourceExists = jest.fn().mockRejectedValueOnce(new InternalServerError());
+    store1.hasResource = jest.fn().mockRejectedValueOnce(new InternalServerError());
     await expect(rule.handle({ identifier: { path: 'identifier' }})).rejects.toThrow(InternalServerError);
   });
 });