From 7a1592e3f34b542b1380842e217e4969e2830561 Mon Sep 17 00:00:00 2001
From: William Durand <will+git@drnd.me>
Date: Tue, 7 Aug 2018 23:40:35 +0200
Subject: [PATCH 1/2] Add custom reporter to reduce the test output

---
 jest.config.js                    |  1 +
 tests/fingers-crossed-reporter.js | 33 +++++++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 tests/fingers-crossed-reporter.js

diff --git a/jest.config.js b/jest.config.js
index d8919b232ef..7739b2ff4d7 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -15,6 +15,7 @@ module.exports = {
     // Replaces the following formats with an empty module.
     '^.+\\.(scss|css|svg|woff|woff2|mp4|webm)$': '<rootDir>/tests/emptyModule',
   },
+  reporters: ['<rootDir>/tests/fingers-crossed-reporter.js'],
   setupTestFrameworkScriptFile: '<rootDir>/tests/setup.js',
   testPathIgnorePatterns: [
     '<rootDir>/node_modules/',
diff --git a/tests/fingers-crossed-reporter.js b/tests/fingers-crossed-reporter.js
new file mode 100644
index 00000000000..4408b5bfa26
--- /dev/null
+++ b/tests/fingers-crossed-reporter.js
@@ -0,0 +1,33 @@
+/* eslint import/no-extraneous-dependencies: 0 */
+const chalk = require('chalk');
+const { getConsoleOutput } = require('jest-util');
+const DefaultReporter = require('jest-cli/build/reporters/default_reporter')
+  .default;
+const getResultHeader = require('jest-cli/build/reporters/get_result_header')
+  .default;
+
+const TITLE_BULLET = chalk.bold('\u25cf ');
+
+// This Jest reporter does not output any console.log except when the tests are
+// failing, see: https://github.com/mozilla/addons-frontend/issues/2980.
+class FingersCrossedReporter extends DefaultReporter {
+  printTestFileHeader(testPath, config, result) {
+    this.log(getResultHeader(result, this._globalConfig, config));
+
+    const consoleBuffer = result.console;
+    const testFailed = result.numFailingTests > 0;
+
+    if (testFailed && consoleBuffer && consoleBuffer.length) {
+      // prettier-ignore
+      this.log(
+        `  ${TITLE_BULLET}Console\n\n${getConsoleOutput(
+          config.cwd,
+          !!this._globalConfig.verbose,
+          consoleBuffer
+        )}`
+      );
+    }
+  }
+}
+
+module.exports = FingersCrossedReporter;

From ea33d5edd7e1ec805226789f159404014e69ef0f Mon Sep 17 00:00:00 2001
From: William Durand <will+git@drnd.me>
Date: Wed, 8 Aug 2018 18:00:07 +0200
Subject: [PATCH 2/2] move file to tests/jest-reporters/

---
 jest.config.js                                                  | 2 +-
 .../fingers-crossed.js}                                         | 0
 2 files changed, 1 insertion(+), 1 deletion(-)
 rename tests/{fingers-crossed-reporter.js => jest-reporters/fingers-crossed.js} (100%)

diff --git a/jest.config.js b/jest.config.js
index 7739b2ff4d7..9d6b9b80a4c 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -15,7 +15,7 @@ module.exports = {
     // Replaces the following formats with an empty module.
     '^.+\\.(scss|css|svg|woff|woff2|mp4|webm)$': '<rootDir>/tests/emptyModule',
   },
-  reporters: ['<rootDir>/tests/fingers-crossed-reporter.js'],
+  reporters: ['<rootDir>/tests/jest-reporters/fingers-crossed.js'],
   setupTestFrameworkScriptFile: '<rootDir>/tests/setup.js',
   testPathIgnorePatterns: [
     '<rootDir>/node_modules/',
diff --git a/tests/fingers-crossed-reporter.js b/tests/jest-reporters/fingers-crossed.js
similarity index 100%
rename from tests/fingers-crossed-reporter.js
rename to tests/jest-reporters/fingers-crossed.js