From 56b3c501230a8bb15f3e24f32535977ae4609c36 Mon Sep 17 00:00:00 2001
From: Paul Gschwendtner <paulgschwendtner@gmail.com>
Date: Tue, 5 Feb 2019 16:36:51 +0100
Subject: [PATCH] build: shard component e2e tests with bazel (#15078)

Currently running the e2e tests with Bazel takes about ~6 minutes. This is pretty slow in comparison to how fast the tests ran with our gulp setup.

In order to speed up the tests with Bazel by taking advantage of RBE's parallelism, we shard the e2e tests by creating a Bazel test target for each e2e spec file.
---
 e2e/BUILD.bazel | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/e2e/BUILD.bazel b/e2e/BUILD.bazel
index 9fc232582cf..332ff9c1722 100644
--- a/e2e/BUILD.bazel
+++ b/e2e/BUILD.bazel
@@ -4,8 +4,8 @@ load("@angular//:index.bzl", "protractor_web_test_suite")
 load("//tools:defaults.bzl", "ts_library")
 
 ts_library(
-  name = "e2e_specs_lib",
-  srcs = glob(["**/*.ts"]),
+  name = "e2e_utils_lib",
+  srcs = glob(["util/**/*.ts"]),
   tsconfig = ":tsconfig.json",
   deps = [
     "@matdeps//@types/jasmine",
@@ -13,18 +13,34 @@ ts_library(
   ]
 )
 
-protractor_web_test_suite(
-  name = "e2e",
+# For each spec file in the "components/" folder, we declare a Bazel target
+# that builds the JavaScript outputs for the e2e spec file.
+[ts_library(
+   name = "%s_specs_lib" % spec_file,
+   srcs = [spec_file],
+   tsconfig = ":tsconfig.json",
+   deps = [
+     "@matdeps//@types/jasmine",
+     "@matdeps//protractor",
+     ":e2e_utils_lib",
+   ]
+ ) for spec_file in glob(["components/**/*.spec.ts"])]
+
+# For each spec file in the "components/" folder, we declare a Protractor web test
+# suite target that runs the given e2e spec against the e2e-app devserver.
+[protractor_web_test_suite(
+  name = "%s_e2e" % spec_file,
   configuration = ":protractor.conf.js",
   on_prepare = ":start-devserver.js",
   server = "//src/e2e-app:devserver",
   deps = [
     "@matdeps//protractor",
-    ":e2e_specs_lib"
+    ":%s_specs_lib" % spec_file,
+    ":e2e_utils_lib",
   ],
   data = [
     "@angular//packages/bazel/src/protractor/utils",
     "//tools/axe-protractor",
   ],
-)
+) for spec_file in glob(["components/**/*.spec.ts"])]