Reduce debug output in tests

src/testing-utils.ts

@@ -0,0 +1,27 @@
+import {TestInterface} from 'ava';
+
+export function silenceDebugOutput(test: TestInterface<any>) {
+  const typedTest = test as TestInterface<{write: any}>;
+
+  typedTest.beforeEach(t => {
+      const processStdoutWrite = process.stdout.write.bind(process.stdout);
+      t.context.write = processStdoutWrite;
+      process.stdout.write = (str: Uint8Array | string, encoding?: any, cb?: (err?: Error) => void) => {
+          // Core library will directly call process.stdout.write for commands
+          // We don't want debug output to be included in tests
+          if (typeof str === "string") {
+            str = str.replace(/::(info|debug|warning).*/, '');
+            if (str.trim() !== "") {
+                processStdoutWrite(str, encoding, cb);
+            }
+          } else {
+            processStdoutWrite(str, encoding, cb);
+          }
+          return true;
+      };
+  });
+
+  typedTest.afterEach(t => {
+      process.stdout.write = t.context.write;
+  });
+}