Migrate legacy tests to //tests/core/go_download_sdk (a go_bazel_test)

Updates bazel-contrib#2285

.bazelci/presubmit.yml

@@ -178,9 +178,7 @@ platforms:
     - "-//tests/integration/googleapis:color_service_go_proto"
     - "-//tests/integration/googleapis:color_service_proto"
     - "-//tests/integration/googleapis:color_service_test"
-    - "-//tests/legacy/build_with_old_sdk:build_with_old_sdk"
     - "-//tests/legacy/cgo_library_root_dir:cgo_library_root_dir"
-    - "-//tests/legacy/custom_go_toolchain:custom_go_toolchain"
     - "-//tests/legacy/examples/cgo/example_command:example_command_test"
     - "-//tests/legacy/examples/cgo/example_command:example_command_script"
     - "-//tests/legacy/examples/cgo/example_command:example_command"
@@ -294,9 +292,7 @@ platforms:
     - "-//tests/core/stdlib:buildid_test"
     - "-//tests/examples/executable_name:executable_name"
     - "-//tests/integration/googleapis:color_service_test"
-    - "-//tests/legacy/build_with_old_sdk:build_with_old_sdk"
     - "-//tests/legacy/cgo_library_root_dir:cgo_library_root_dir"
-    - "-//tests/legacy/custom_go_toolchain:custom_go_toolchain"
     - "-//tests/legacy/examples/cgo/example_command:example_command_test"
     - "-//tests/legacy/examples/cgo/example_command:example_command_script"
     - "-//tests/legacy/examples/cgo/example_command:example_command"

tests/core/README.rst

@@ -20,6 +20,7 @@ Contents
 * `Basic go_test functionality <go_test/README.rst>`_
 * `.. _#2067: https://github.com/bazelbuild/rules_go/issues/2067 <cgo/README.rst>`_
 * `Runfiles functionality <runfiles/README.rst>`_
+* `go_download_sdk <go_download_sdk/README.rst>`_
 * `race instrumentation <race/README.rst>`_
 * `stdlib functionality <stdlib/README.rst>`_
 * `Basic go_binary functionality <go_binary/README.rst>`_

tests/core/go_download_sdk/BUILD.bazel

@@ -0,0 +1,6 @@
+load("@io_bazel_rules_go//go/tools/bazel_testing:def.bzl", "go_bazel_test")
+
+go_bazel_test(
+    name = "go_download_sdk_test",
+    srcs = ["go_download_sdk_test.go"],
+)

tests/core/go_download_sdk/README.rst

@@ -0,0 +1,7 @@
+go_download_sdk
+===============
+
+go_download_sdk_test
+--------------------
+Verifies that ``go_downlaod_sdk`` can be used to download a specific version
+or a set of archives for various platforms.

tests/core/go_download_sdk/go_download_sdk_test.go

@@ -0,0 +1,122 @@
+// Copyright 2019 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package go_download_sdk_test
+
+import (
+	"bytes"
+	"io/ioutil"
+	"testing"
+
+	"github.com/bazelbuild/rules_go/go/tools/bazel_testing"
+)
+
+func TestMain(m *testing.M) {
+	bazel_testing.TestMain(m, bazel_testing.Args{
+		Main: `
+-- BUILD.bazel --
+load("@io_bazel_rules_go//go:def.bzl", "go_test")
+
+go_test(
+    name = "version_test",
+    srcs = ["version_test.go"],
+)
+
+-- version_test.go --
+package version_test
+
+import (
+	"flag"
+	"runtime"
+	"testing"
+)
+
+var want = flag.String("version", "", "")
+
+func Test(t *testing.T) {
+	if v := runtime.Version(); v != *want {
+		t.Errorf("got version %q; want %q", v, *want)
+	}
+}
+`,
+	})
+}
+
+func Test(t *testing.T) {
+	for _, test := range []struct {
+		desc, rule, wantVersion string
+	}{
+		{
+			desc: "version",
+			rule: `
+load("@io_bazel_rules_go//go:deps.bzl", "go_download_sdk")
+
+go_download_sdk(
+    name = "go_sdk",
+    version = "1.12.13",
+)
+
+`,
+			wantVersion: "go1.12.13",
+		}, {
+			desc: "custom_archives",
+			rule: `
+load("@io_bazel_rules_go//go:deps.bzl", "go_download_sdk")
+
+go_download_sdk(
+    name = "go_sdk",
+    sdks = {
+        "darwin_amd64":      ("go1.12.13.darwin-amd64.tar.gz", "6d3de6f7d7c0e8162aaa009128839fa5afcba578dcbd6ff034a82419d82480e9"),
+        "linux_amd64":       ("go1.12.13.linux-amd64.tar.gz", "da036454cb3353f9f507f0ceed4048feac611065e4e1818b434365eb32ac9bdc"),
+        "windows_amd64":     ("go1.12.13.windows-amd64.zip", "c441a298e8b510d3cdabfd361885cd6762e33eaceb27cbb0eabe6757f9d1f07d"),
+    },
+)
+`,
+			wantVersion: "go1.12.13",
+		},
+	} {
+		t.Run(test.desc, func(t *testing.T) {
+			origWorkspaceData, err := ioutil.ReadFile("WORKSPACE")
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			i := bytes.Index(origWorkspaceData, []byte("go_rules_dependencies()"))
+			if i < 0 {
+				t.Fatalf("%s: could not find call to go_rules_dependencies()")
+			}
+
+			buf := &bytes.Buffer{}
+			buf.Write(origWorkspaceData[:i])
+			buf.WriteString(test.rule)
+			buf.WriteString(`
+go_rules_dependencies()
+
+go_register_toolchains()
+`)
+			if err := ioutil.WriteFile("WORKSPACE", buf.Bytes(), 0666); err != nil {
+				t.Fatal(err)
+			}
+			defer func() {
+				if err := ioutil.WriteFile("WORKSPACE", origWorkspaceData, 0666); err != nil {
+					t.Errorf("error restoring WORKSPACE: %v", err)
+				}
+			}()
+
+			if err := bazel_testing.RunBazel("test", "//:version_test", "--test_arg=-version="+test.wantVersion); err != nil {
+				t.Fatal(err)
+			}
+		})
+	}
+}