chore(otlp-exporter-base): add legacy agent factory test

Author: raphael-theriault-swi

.github/workflows/unit-test.yml

@@ -14,7 +14,7 @@ jobs:
         node_version:
           - "18.19.0"
           - "18"
-          - "20.6.0"
+          - "20.6.1" # `import`ing cjs code is broken on 20.6.0
           - "20"
           - "22"
           - "23"
@@ -40,7 +40,7 @@ jobs:
         if: ${{
           matrix.node_version == '18.19.0' ||
           matrix.node_version == '18' ||
-          matrix.node_version == '20.6.0'
+          matrix.node_version == '20.6.1'
           }}
       - run: npm install -g npm@latest
         if: ${{

experimental/packages/otlp-exporter-base/test/node/configuration/convert-legacy-node-otlp-http-options.test.ts

@@ -41,6 +41,20 @@ describe('convertLegacyHttpOptions', function () {
     );
   });
 
+  it('should keep agent factory as-is', function () {
+    // act
+    const factory = () => null!;
+    const options = convertLegacyHttpOptions(
+      { httpAgentOptions: factory },
+      'SIGNAL',
+      'v1/signal',
+      {}
+    );
+
+    // assert
+    assert.strictEqual(options.agent, factory);
+  });
+
   it('should keep specific keepAlive', async () => {
     // act
     const options = convertLegacyHttpOptions(