I want to create a Bazel C++ project with gtest for unit tests.

What is the minimal setup?

(I only have Bazel installed on my computer and I am running under Linux)

This is even easier now that googletest provides a BUILD file:

In WORKSPACE

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
git_repository(
    name = "gtest",
    remote = "https://github.com/google/googletest",
    branch = "v1.10.x",
)

In BUILD

cc_test (
    name = "hello_test",
    srcs = [
        "hello_test.cc",
    ],
    deps = [
        "@gtest//:gtest",
        "@gtest//:gtest_main" # Only if hello_test.cc has no main()
    ],
)