test(reference): unit tests for resolving references for Server Variables in AsyncAPI3

packages/apidom-reference/test/dereference/strategies/asyncapi-3/server-variable/fixtures/components-server-variables/dereferenced.json

@@ -0,0 +1,15 @@
+[
+  {
+    "asyncapi": "3.0.0",
+    "components": {
+      "serverVariables": {
+        "variable1": {
+          "enum": ["a", "b", "c"]
+        },
+        "variable2": {
+          "enum": ["a", "b", "c"]
+        }
+      }
+    }
+  }
+]

packages/apidom-reference/test/dereference/strategies/asyncapi-3/server-variable/fixtures/components-server-variables/root.json

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+{
+  "asyncapi": "3.0.0",
+  "components": {
+    "serverVariables": {
+      "variable1": {
+        "enum": ["a", "b", "c"]
+      },
+      "variable2": {
+        "$ref": "#/components/serverVariables/variable1"
+      }
+    }
+  }
+}

packages/apidom-reference/test/dereference/strategies/asyncapi-3/server-variable/fixtures/server-variables/dereferenced.json

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+[
+  {
+    "asyncapi": "3.0.0",
+    "components": {
+      "servers": {
+        "server1": {
+          "host": "http://example.com",
+          "protocol": "protocol",
+          "variables": {
+            "variable1": {
+              "enum": ["a", "b", "c"]
+            },
+            "variable2": {
+              "enum": ["a", "b", "c"]
+            }
+          }
+        }
+      }
+    }
+  }
+]

packages/apidom-reference/test/dereference/strategies/asyncapi-3/server-variable/fixtures/server-variables/root.json

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+{
+  "asyncapi": "3.0.0",
+  "components": {
+    "servers": {
+      "server1": {
+        "host": "http://example.com",
+        "protocol": "protocol",
+        "variables": {
+          "variable1": {
+            "enum": ["a", "b", "c"]
+          },
+          "variable2": {
+            "$ref": "#/components/servers/server1/variables/variable1"
+          }
+        }
+      }
+    }
+  }
+}

packages/apidom-reference/test/dereference/strategies/asyncapi-3/server-variable/index.ts

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+import path from 'node:path';
+import { assert } from 'chai';
+import { toValue } from '@swagger-api/apidom-core';
+import { mediaTypes } from '@swagger-api/apidom-ns-asyncapi-3';
+import { fileURLToPath } from 'node:url';
+
+import { loadJsonFile } from '../../../../helpers.ts';
+import { dereference } from '../../../../../src/index.ts';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const rootFixturePath = path.join(__dirname, 'fixtures');
+
+describe('dereference', function () {
+  context('strategies', function () {
+    context('asyncapi-3', function () {
+      context('ServerVariable Object', function () {
+        context('given in server/variables field', function () {
+          const fixturePath = path.join(rootFixturePath, 'server-variables');
+
+          specify('should dereference', async function () {
+            const rootFilePath = path.join(fixturePath, 'root.json');
+            const actual = await dereference(rootFilePath, {
+              parse: { mediaType: mediaTypes.latest('json') },
+            });
+            const expected = loadJsonFile(path.join(fixturePath, 'dereferenced.json'));
+
+            assert.deepEqual(toValue(actual), expected);
+          });
+        });
+
+        context('given in components/serverVariables field', function () {
+          const fixturePath = path.join(rootFixturePath, 'components-server-variables');
+
+          specify('should dereference', async function () {
+            const rootFilePath = path.join(fixturePath, 'root.json');
+            const actual = await dereference(rootFilePath, {
+              parse: { mediaType: mediaTypes.latest('json') },
+            });
+            const expected = loadJsonFile(path.join(fixturePath, 'dereferenced.json'));
+
+            assert.deepEqual(toValue(actual), expected);
+          });
+        });
+      });
+    });
+  });
+});