fix qodana findings

Author: lstreckeisen

src/language/references/ContextMapperDslScopeComputation.ts

@@ -8,10 +8,10 @@ export class ContextMapperDslScopeComputation extends DefaultScopeComputation {
     Without imports, this behavior is wrong and therefore no nodes must be exported here.
    */
   override computeExportsForNode (
-    parentNode: AstNode,
-    document: LangiumDocument<AstNode>,
-    children?: (root: AstNode) => Iterable<AstNode>,
-    cancelToken?: CancellationToken
+    _parentNode: AstNode,
+    _document: LangiumDocument,
+    _children?: (root: AstNode) => Iterable<AstNode>,
+    _cancelToken?: CancellationToken
   ): Promise<AstNodeDescription[]> {
     return Promise.resolve([])
   }

test/validation/ValidationHelper.test.ts

@@ -64,6 +64,16 @@ describe('ValidationHelper tests', () => {
     expect(acceptor).toHaveBeenCalledTimes(1)
   })
 
+  test('enforceZeroOrOneCardinality with multiple keywords', () => {
+    const node = {
+      key: ['test', 'test2']
+    } as TestNode
+
+    enforceZeroOrOneCardinality(node, 'key', acceptor, ['key', 'keyx'])
+
+    expect(acceptor).toHaveBeenCalledTimes(2)
+  })
+
   test('enforceZeroOrOneCardinalityOfListAttribute with no match', () => {
     const node: TestNode = {
       $cstNode: {
@@ -115,4 +125,32 @@ describe('ValidationHelper tests', () => {
 
     expect(acceptor).toHaveBeenCalledTimes(1)
   })
+
+  test('enforceZeroOrOneCardinalityOfListAttribute with multiple keywords', () => {
+    const node: TestNode = {
+      $cstNode: {
+        text: `
+          Test Structurekey {
+            key "test", "key"
+            keyx "test2", "key2"
+          }
+        `
+      },
+      key: ['test', 'key', 'test2', 'key2']
+    } as TestNode
+
+    enforceZeroOrOneCardinalityOfListAttribute(node, 'key', acceptor, ['key', 'keyx'])
+
+    expect(acceptor).toHaveBeenCalledTimes(2)
+  })
+
+  test('enforceZeroOrOneCardinalityOfListAttribute with non-array', () => {
+    const node = {
+      key: 'abc'
+    } as NonArrayNode
+
+    enforceZeroOrOneCardinalityOfListAttribute(node, 'key', acceptor)
+
+    expect(acceptor).toHaveBeenCalledTimes(1)
+  })
 })