Added coverage keep-alive reporter.

packages/tests/src.ts/reporter-keepalive.ts

@@ -0,0 +1,93 @@
+/* istanbul ignore file */
+
+'use strict';
+
+// Maximum time in seconds to suppress output
+const MAX_DELAY = 30;
+
+function getTime(): number {
+    return (new Date()).getTime();
+}
+
+interface Suite {
+    title: string;
+    file: string;
+    suites: Array<Suite>;
+}
+
+interface Runner {
+  on(event: string, callback: (...args: Array<any>) => void): Runner;
+}
+
+export function ReporterKeepAlive(runner: Runner) {
+    let suites = 0;
+    let fails = 0;
+    const errors: Array<string> = [ ];
+
+    const stdoutWrite = process.stdout.write.bind(process.stdout);
+    //process.stdout.write = function(buffer: string | Uint8Array, cb?: (err?: Error) => void): boolean {
+    process.stdout.write = function(...args: Array<any>): boolean {
+        return stdoutWrite("*");
+    }
+
+    // Force Output; Keeps the console output alive with periodic updates
+    let lastOutput = getTime();
+    function forceOutput() {
+        if (((getTime() - lastOutput) / 1000) > MAX_DELAY) {
+            log(".");
+        }
+    }
+    const timer = setInterval(forceOutput, 1000);
+
+    function log(message: string): void {
+        stdoutWrite(message);
+        lastOutput = getTime();
+    }
+
+    runner.on('suite', function(suite: Suite) {
+        suites++;
+        fails = 0;
+        log("[");
+    });
+
+    runner.on('suite end', function() {
+        suites--;
+        log("]");
+
+        if (suites === 0) {
+            process.stdout.write = stdoutWrite;
+            clearTimeout(timer);
+            console.log("")
+            if (errors.length) {
+                console.log("---------------")
+                errors.forEach((error, index) => {
+                    if (index > 0) { console.log(""); }
+                    console.log(error);
+                });
+            }
+            console.log("---------------")
+        }
+    });
+
+    runner.on('test', function(test) {
+        forceOutput();
+    });
+
+    runner.on('fail', function(test, error) {
+        fails++;
+        if (fails < 10) {
+            errors.push(`Error #${ errors.length } (${ test.title }): ${ error.message }\n${ error.stack }`);
+            log("!");
+        }
+    });
+
+    runner.on('pass', function(test) {
+        forceOutput();
+
+    });
+
+    runner.on('pending', function(test) {
+        log("?");
+    });
+}
+