dont show all 20 send messages

support muting a logger and chaining calls

src/scenario.js

@@ -111,8 +111,11 @@ async function aLazyLoadingTest(alice, bob, charlies) {
     await bob.delay(500);
     await charlies.join(alias);
     const messageRange = range(1, 20);
+    bob.log.step("sends 20 messages").mute();
     for(let i = 20; i >= 1; --i) {
         await sendMessage(bob, `I will only say this ${i} time(s)!`);
     }
+    bob.log.unmute().done();
     await join(alice, room);
+
 }

src/session.js

@@ -35,25 +35,46 @@ class Logger {
     constructor(username) {
         this.indent = 0;
         this.username = username;
+        this.muted = false;
     }
 
     startGroup(description) {
-        const indent = " ".repeat(this.indent * 2);
-        console.log(`${indent} * ${this.username} ${description}:`);
+        if (!this.muted) {
+            const indent = " ".repeat(this.indent * 2);
+            console.log(`${indent} * ${this.username} ${description}:`);
+        }
         this.indent += 1;
+        return this;
     }
 
     endGroup() {
         this.indent -= 1;
+        return this;
     }
 
     step(description) {
-        const indent = " ".repeat(this.indent * 2);
-        process.stdout.write(`${indent} * ${this.username} ${description} ... `);
+        if (!this.muted) {
+            const indent = " ".repeat(this.indent * 2);
+            process.stdout.write(`${indent} * ${this.username} ${description} ... `);
+        }
+        return this;
     }
 
     done(status = "done") {
-        process.stdout.write(status + "\n");
+        if (!this.muted) {
+            process.stdout.write(status + "\n");
+        }
+        return this;
+    }
+
+    mute() {
+        this.muted = true;
+        return this;
+    }
+
+    unmute() {
+        this.muted = false;
+        return this;
     }
 }