chore: test

Author: aryamohanan

packages/core/test/config/normalizeConfig_test.js

@@ -591,10 +591,50 @@ describe('config.normalizeConfig', () => {
         expect(config.tracing.stackTraceLength).to.equal(10);
       });
 
+      it('should use default when INSTANA_STACK_TRACE passes validation but normalizer returns null', () => {
+        const stackTraceNormalizers = require('../../src/config/configNormalizers/stackTrace');
+        const original = stackTraceNormalizers.normalizeStackTraceModeFromEnv;
+        stackTraceNormalizers.normalizeStackTraceModeFromEnv = () => null;
+
+        process.env.INSTANA_STACK_TRACE = 'all';
+        const config = coreConfig.normalize();
+        expect(config.tracing.stackTrace).to.equal('all');
+
+        stackTraceNormalizers.normalizeStackTraceModeFromEnv = original;
+      });
+
+      it('should use default when config stackTrace passes validation but normalizer returns null', () => {
+        const stackTraceNormalizers = require('../../src/config/configNormalizers/stackTrace');
+        const original = stackTraceNormalizers.normalizeStackTraceMode;
+        stackTraceNormalizers.normalizeStackTraceMode = () => null;
+
+        const config = coreConfig.normalize({ tracing: { global: { stackTrace: 'all' } } });
+        expect(config.tracing.stackTrace).to.equal('all');
+
+        stackTraceNormalizers.normalizeStackTraceMode = original;
+      });
+
       it('should use default when INSTANA_STACK_TRACE_LENGTH passes validation but normalizer returns null', () => {
-        process.env.INSTANA_STACK_TRACE_LENGTH = null;
+        const stackTraceNormalizers = require('../../src/config/configNormalizers/stackTrace');
+        const original = stackTraceNormalizers.normalizeStackTraceLengthFromEnv;
+        stackTraceNormalizers.normalizeStackTraceLengthFromEnv = () => null;
+
+        process.env.INSTANA_STACK_TRACE_LENGTH = '10';
         const config = coreConfig.normalize();
         expect(config.tracing.stackTraceLength).to.equal(10);
+
+        stackTraceNormalizers.normalizeStackTraceLengthFromEnv = original;
+      });
+
+      it('should use default when config stackTraceLength passes validation but normalizer returns null', () => {
+        const stackTraceNormalizers = require('../../src/config/configNormalizers/stackTrace');
+        const original = stackTraceNormalizers.normalizeStackTraceLength;
+        stackTraceNormalizers.normalizeStackTraceLength = () => null;
+
+        const config = coreConfig.normalize({ tracing: { global: { stackTraceLength: 20 } } });
+        expect(config.tracing.stackTraceLength).to.equal(10);
+
+        stackTraceNormalizers.normalizeStackTraceLength = original;
       });
 
       it('should reject INSTANA_STACK_TRACE_LENGTH with only whitespace', () => {