Test that the built toolchain works with the example Bazel project (#6653)

I wasn't sure I'd be able to really test this code path, but then
I remembered that Bazel has a whole platform for running Bazel from
within an integration test, and it turns out to work brilliantly. It
even lets us point the child Bazel invocations to the just-built
toolchain.

This should both give us confidence that we don't accidentally hit
a Bazel incompatibility with the example project, and it should ensure
that if something about the installed toolchain would stop being
compatible with building via Bazel we'll catch it early.

The tests are integration tests and so a bit slow: 15s or so. But
`//examples/...` is already pretty expensive and no other testing
patterns are impacted.

.pre-commit-config.yaml

@@ -148,12 +148,14 @@ repos:
         # Exclusions are:
         # - p#### scripts because they're not tested or maintained.
         # - lit.cfg.py because it has multiple copies, breaking mypy.
+        # - `bazel_test_runner.py` which depends on Bazel-specific imports.
         # - Unit tests because they sometimes violate typing, such as by
         #   assigning a mock to a function.
         exclude: |
           (?x)^(
               proposals/(?!scripts/).*|
               .*/lit\.cfg\.py|
+              examples/bazel_test_runner\.py|
               .*_test\.py
           )$
   - repo: https://github.com/codespell-project/codespell

MODULE.bazel

@@ -142,3 +142,32 @@ python.toolchain(
     python_version = "3.11",
 )
 use_repo(python, "python_versions")
+
+###############################################################################
+# Bazel integration testing
+###############################################################################
+
+bazel_dep(
+    name = "rules_bazel_integration_test",
+    version = "0.36.0",
+    dev_dependency = True,
+)
+
+# We test against our current Bazel version, the latest release, and the latest
+# release candidate.
+bazel_binaries = use_extension(
+    "@rules_bazel_integration_test//:extensions.bzl",
+    "bazel_binaries",
+    dev_dependency = True,
+)
+bazel_binaries.download(version_file = "//:.bazelversion")
+bazel_binaries.download(version = "latest")
+bazel_binaries.download(version = "last_rc")
+use_repo(
+    bazel_binaries,
+    "bazel_binaries",
+    "bazel_binaries_bazelisk",
+    "build_bazel_bazel_.bazelversion",
+    "build_bazel_bazel_last_rc",
+    "build_bazel_bazel_latest",
+)

MODULE.bazel.lock

@@ -25,10 +25,16 @@
     "https://bcr.bazel.build/modules/aspect_bazel_lib/1.31.2/MODULE.bazel": "7bee702b4862612f29333590f4b658a5832d433d6f8e4395f090e8f4e85d442f",
     "https://bcr.bazel.build/modules/aspect_bazel_lib/1.38.0/MODULE.bazel": "6307fec451ba9962c1c969eb516ebfe1e46528f7fa92e1c9ac8646bef4cdaa3f",
     "https://bcr.bazel.build/modules/aspect_bazel_lib/1.40.3/MODULE.bazel": "668e6bcb4d957fc0e284316dba546b705c8d43c857f87119619ee83c4555b859",
+    "https://bcr.bazel.build/modules/aspect_bazel_lib/2.14.0/MODULE.bazel": "2b31ffcc9bdc8295b2167e07a757dbbc9ac8906e7028e5170a3708cecaac119f",
+    "https://bcr.bazel.build/modules/aspect_bazel_lib/2.19.3/MODULE.bazel": "253d739ba126f62a5767d832765b12b59e9f8d2bc88cc1572f4a73e46eb298ca",
+    "https://bcr.bazel.build/modules/aspect_bazel_lib/2.22.4/MODULE.bazel": "a05cbd9bc16712a58dc27ffe0dceaefd0da59a9bd87a227379b2a934b26a39ab",
+    "https://bcr.bazel.build/modules/aspect_bazel_lib/2.22.4/source.json": "9780bc57f521968ee82b7c3e85b7d0c71518fb7ce83ed7a9e5077ce20923207b",
+    "https://bcr.bazel.build/modules/aspect_bazel_lib/2.8.1/MODULE.bazel": "812d2dd42f65dca362152101fbec418029cc8fd34cbad1a2fde905383d705838",
     "https://bcr.bazel.build/modules/aspect_rules_js/1.33.1/MODULE.bazel": "db3e7f16e471cf6827059d03af7c21859e7a0d2bc65429a3a11f005d46fc501b",
     "https://bcr.bazel.build/modules/aspect_rules_js/1.39.0/MODULE.bazel": "aece421d479e3c31dc3e5f6d49a12acc2700457c03c556650ec7a0ff23fc0d95",
     "https://bcr.bazel.build/modules/aspect_rules_lint/0.12.0/MODULE.bazel": "e767c5dbfeb254ec03275a7701b5cfde2c4d2873676804bc7cb27ddff3728fed",
     "https://bcr.bazel.build/modules/bazel_features/0.1.0/MODULE.bazel": "47011d645b0f949f42ee67f2e8775188a9cf4a0a1528aa2fa4952f2fd00906fd",
+    "https://bcr.bazel.build/modules/bazel_features/1.1.0/MODULE.bazel": "cfd42ff3b815a5f39554d97182657f8c4b9719568eb7fded2b9135f084bf760b",
     "https://bcr.bazel.build/modules/bazel_features/1.1.1/MODULE.bazel": "27b8c79ef57efe08efccbd9dd6ef70d61b4798320b8d3c134fd571f78963dbcd",
     "https://bcr.bazel.build/modules/bazel_features/1.11.0/MODULE.bazel": "f9382337dd5a474c3b7d334c2f83e50b6eaedc284253334cf823044a26de03e8",
     "https://bcr.bazel.build/modules/bazel_features/1.15.0/MODULE.bazel": "d38ff6e517149dc509406aca0db3ad1efdd890a85e049585b7234d04238e2a4d",
@@ -42,7 +48,10 @@
     "https://bcr.bazel.build/modules/bazel_features/1.33.0/MODULE.bazel": "8b8dc9d2a4c88609409c3191165bccec0e4cb044cd7a72ccbe826583303459f6",
     "https://bcr.bazel.build/modules/bazel_features/1.33.0/source.json": "13617db3930328c2cd2807a0f13d52ca870ac05f96db9668655113265147b2a6",
     "https://bcr.bazel.build/modules/bazel_features/1.4.1/MODULE.bazel": "e45b6bb2350aff3e442ae1111c555e27eac1d915e77775f6fdc4b351b758b5d7",
+    "https://bcr.bazel.build/modules/bazel_features/1.9.0/MODULE.bazel": "885151d58d90d8d9c811eb75e3288c11f850e1d6b481a8c9f766adee4712358b",
     "https://bcr.bazel.build/modules/bazel_features/1.9.1/MODULE.bazel": "8f679097876a9b609ad1f60249c49d68bfab783dd9be012faf9d82547b14815a",
+    "https://bcr.bazel.build/modules/bazel_lib/3.0.0/MODULE.bazel": "22b70b80ac89ad3f3772526cd9feee2fa412c2b01933fea7ed13238a448d370d",
+    "https://bcr.bazel.build/modules/bazel_lib/3.0.0/source.json": "895f21909c6fba01d7c17914bb6c8e135982275a1b18cdaa4e62272217ef1751",
     "https://bcr.bazel.build/modules/bazel_skylib/1.0.3/MODULE.bazel": "bcb0fd896384802d1ad283b4e4eb4d718eebd8cb820b0a2c3a347fb971afd9d8",
     "https://bcr.bazel.build/modules/bazel_skylib/1.1.1/MODULE.bazel": "1add3e7d93ff2e6998f9e118022c84d163917d912f5afafb3058e3d2f1545b5e",
     "https://bcr.bazel.build/modules/bazel_skylib/1.2.0/MODULE.bazel": "44fe84260e454ed94ad326352a698422dbe372b21a1ac9f3eab76eb531223686",
@@ -55,20 +64,33 @@
     "https://bcr.bazel.build/modules/bazel_skylib/1.7.0/MODULE.bazel": "0db596f4563de7938de764cc8deeabec291f55e8ec15299718b93c4423e9796d",
     "https://bcr.bazel.build/modules/bazel_skylib/1.7.1/MODULE.bazel": "3120d80c5861aa616222ec015332e5f8d3171e062e3e804a2a0253e1be26e59b",
     "https://bcr.bazel.build/modules/bazel_skylib/1.8.1/MODULE.bazel": "88ade7293becda963e0e3ea33e7d54d3425127e0a326e0d17da085a5f1f03ff6",
+    "https://bcr.bazel.build/modules/bazel_skylib/1.8.2/MODULE.bazel": "69ad6927098316848b34a9142bcc975e018ba27f08c4ff403f50c1b6e646ca67",
     "https://bcr.bazel.build/modules/bazel_skylib/1.9.0/MODULE.bazel": "72997b29dfd95c3fa0d0c48322d05590418edef451f8db8db5509c57875fb4b7",
     "https://bcr.bazel.build/modules/bazel_skylib/1.9.0/source.json": "7ad77c1e8c1b84222d9b3f3cae016a76639435744c19330b0b37c0a3c9da7dc0",
     "https://bcr.bazel.build/modules/boringssl/0.0.0-20240530-2db0eb3/MODULE.bazel": "d0405b762c5e87cd445b7015f2b8da5400ef9a8dbca0bfefa6c1cea79d528a97",
     "https://bcr.bazel.build/modules/boringssl/0.0.0-20240530-2db0eb3/source.json": "0d413869349e82e5d679802abe9ce23e0326bbf56daa97ae9e7dbdcec72982fc",
     "https://bcr.bazel.build/modules/brotli/1.1.0/MODULE.bazel": "3b5b90488995183419c4b5c9b063a164f6c0bc4d0d6b40550a612a5e860cc0fe",
     "https://bcr.bazel.build/modules/brotli/1.1.0/source.json": "098a4fd315527166e8dfe1fd1537c96a737a83764be38fc43f4da231d600f3d0",
+    "https://bcr.bazel.build/modules/buildifier_prebuilt/7.3.1/MODULE.bazel": "537faf0ad9f5892910074b8e43b4c91c96f1d5d86b6ed04bdbe40cf68aa48b68",
+    "https://bcr.bazel.build/modules/buildifier_prebuilt/7.3.1/source.json": "55153a5e6ca9c8a7e266c4b46b951e8a010d25ec6062bc35d5d4f89925796bad",
     "https://bcr.bazel.build/modules/buildozer/7.1.2/MODULE.bazel": "2e8dd40ede9c454042645fd8d8d0cd1527966aa5c919de86661e62953cd73d84",
     "https://bcr.bazel.build/modules/buildozer/7.1.2/source.json": "c9028a501d2db85793a6996205c8de120944f50a0d570438fcae0457a5f9d1f8",
     "https://bcr.bazel.build/modules/bzip2/1.0.8/MODULE.bazel": "83ee443b286b0b91566e5ee77e74ba6445895f3135467893871560f9e4ebc159",
     "https://bcr.bazel.build/modules/bzip2/1.0.8/source.json": "b64f3a2f973749cf5f6ee32b3d804af56a35a746228a7845ed5daa31c8cc8af1",
+    "https://bcr.bazel.build/modules/cgrindel_bazel_starlib/0.28.0/MODULE.bazel": "85c2dba5f968cbf8aa0fc735cab450f16cd36eed58b941ff7e3587ad442d5627",
+    "https://bcr.bazel.build/modules/cgrindel_bazel_starlib/0.28.0/source.json": "2b2900d443c8de9314ceadb7484d8f1c49af989da4b0d6231dfa859b82223dc1",
     "https://bcr.bazel.build/modules/fuzztest/20241028.0/MODULE.bazel": "55ccf828e88fb6ef6aa7fc477f7d0d442c5e740f8c7581294862645069b4a88d",
     "https://bcr.bazel.build/modules/fuzztest/20241028.0/source.json": "dc9bc5801d78274b062ee1dc1a27a0e1e63f8bd505cd46cc1e914a62c0f5c274",
+    "https://bcr.bazel.build/modules/gawk/5.3.2.bcr.1/MODULE.bazel": "cdf8cbe5ee750db04b78878c9633cc76e80dcf4416cbe982ac3a9222f80713c8",
+    "https://bcr.bazel.build/modules/gawk/5.3.2.bcr.1/source.json": "fa7b512dfcb5eafd90ce3959cf42a2a6fe96144ebbb4b3b3928054895f2afac2",
     "https://bcr.bazel.build/modules/gazelle/0.27.0/MODULE.bazel": "3446abd608295de6d90b4a8a118ed64a9ce11dcb3dda2dc3290a22056bd20996",
     "https://bcr.bazel.build/modules/gazelle/0.30.0/MODULE.bazel": "f888a1effe338491f35f0e0e85003b47bb9d8295ccba73c37e07702d8d31c65b",
+    "https://bcr.bazel.build/modules/gazelle/0.32.0/MODULE.bazel": "b499f58a5d0d3537f3cf5b76d8ada18242f64ec474d8391247438bf04f58c7b8",
+    "https://bcr.bazel.build/modules/gazelle/0.33.0/MODULE.bazel": "a13a0f279b462b784fb8dd52a4074526c4a2afe70e114c7d09066097a46b3350",
+    "https://bcr.bazel.build/modules/gazelle/0.34.0/MODULE.bazel": "abdd8ce4d70978933209db92e436deb3a8b737859e9354fb5fd11fb5c2004c8a",
+    "https://bcr.bazel.build/modules/gazelle/0.36.0/MODULE.bazel": "e375d5d6e9a6ca59b0cb38b0540bc9a05b6aa926d322f2de268ad267a2ee74c0",
+    "https://bcr.bazel.build/modules/gazelle/0.44.0/MODULE.bazel": "fd3177ca0938da57a1e416cad3f39b9c4334defbc717e89aba9d9ddbbb0341da",
+    "https://bcr.bazel.build/modules/gazelle/0.44.0/source.json": "7fb65ef9c1ce470d099ca27fd478673d9d64c844af28d0d472b0874c7d590cb6",
     "https://bcr.bazel.build/modules/google_benchmark/1.8.2/MODULE.bazel": "a70cf1bba851000ba93b58ae2f6d76490a9feb74192e57ab8e8ff13c34ec50cb",
     "https://bcr.bazel.build/modules/google_benchmark/1.8.3/MODULE.bazel": "2349ac3adb7917fdc4378e85fae533015dae3cb583ad1bd5d2c2185106c7c403",
     "https://bcr.bazel.build/modules/google_benchmark/1.9.4/MODULE.bazel": "3bab7c17c10580f87b647478a72a05621f88abc275afb97b578c828f56e59d45",
@@ -82,6 +104,8 @@
     "https://bcr.bazel.build/modules/googletest/1.17.0/source.json": "38e4454b25fc30f15439c0378e57909ab1fd0a443158aa35aec685da727cd713",
     "https://bcr.bazel.build/modules/highwayhash/0.0.0-20240305-5ad3bf8/MODULE.bazel": "5c7f29d5bd70feff14b0f65b39584957e18e4a8d555e5a29a4c36019afbb44b9",
     "https://bcr.bazel.build/modules/highwayhash/0.0.0-20240305-5ad3bf8/source.json": "211c0937ef5f537da6c3c135d12e60927c71b380642e207e4a02b86d29c55e85",
+    "https://bcr.bazel.build/modules/jq.bzl/0.1.0/MODULE.bazel": "2ce69b1af49952cd4121a9c3055faa679e748ce774c7f1fda9657f936cae902f",
+    "https://bcr.bazel.build/modules/jq.bzl/0.1.0/source.json": "746bf13cac0860f091df5e4911d0c593971cd8796b5ad4e809b2f8e133eee3d5",
     "https://bcr.bazel.build/modules/jsoncpp/1.9.5/MODULE.bazel": "31271aedc59e815656f5736f282bb7509a97c7ecb43e927ac1a37966e0578075",
     "https://bcr.bazel.build/modules/jsoncpp/1.9.6/MODULE.bazel": "2f8d20d3b7d54143213c4dfc3d98225c42de7d666011528dc8fe91591e2e17b0",
     "https://bcr.bazel.build/modules/jsoncpp/1.9.6/source.json": "a04756d367a2126c3541682864ecec52f92cdee80a35735a3cb249ce015ca000",
@@ -89,6 +113,8 @@
     "https://bcr.bazel.build/modules/lz4/1.9.4/source.json": "233f0bdfc21f254e3dda14683ddc487ca68c6a3a83b7d5db904c503f85bd089b",
     "https://bcr.bazel.build/modules/nlohmann_json/3.6.1/MODULE.bazel": "6f7b417dcc794d9add9e556673ad25cb3ba835224290f4f848f8e2db1e1fca74",
     "https://bcr.bazel.build/modules/nlohmann_json/3.6.1/source.json": "f448c6e8963fdfa7eb831457df83ad63d3d6355018f6574fb017e8169deb43a9",
+    "https://bcr.bazel.build/modules/package_metadata/0.0.2/MODULE.bazel": "fb8d25550742674d63d7b250063d4580ca530499f045d70748b1b142081ebb92",
+    "https://bcr.bazel.build/modules/package_metadata/0.0.2/source.json": "e53a759a72488d2c0576f57491ef2da0cf4aab05ac0997314012495935531b73",
     "https://bcr.bazel.build/modules/platforms/0.0.10/MODULE.bazel": "8cb8efaf200bdeb2150d93e162c40f388529a25852b332cec879373771e48ed5",
     "https://bcr.bazel.build/modules/platforms/0.0.11/MODULE.bazel": "0daefc49732e227caa8bfa834d65dc52e8cc18a2faf80df25e8caea151a9413f",
     "https://bcr.bazel.build/modules/platforms/0.0.4/MODULE.bazel": "9b328e31ee156f53f3c416a64f8491f7eb731742655a47c9eec4703a71644aee",
@@ -105,6 +131,7 @@
     "https://bcr.bazel.build/modules/protobuf/27.1/MODULE.bazel": "703a7b614728bb06647f965264967a8ef1c39e09e8f167b3ca0bb1fd80449c0d",
     "https://bcr.bazel.build/modules/protobuf/27.5/MODULE.bazel": "1723de82125423bba88590fbbbe7d84792b9de70fa2bd76e9e3d83f9d7f1640b",
     "https://bcr.bazel.build/modules/protobuf/28.2/MODULE.bazel": "c0c8e51757df486d0314fa290e174d707bad4a6c2aa5ccb08a4b4abd76a23e90",
+    "https://bcr.bazel.build/modules/protobuf/29.0-rc2.bcr.1/MODULE.bazel": "52f4126f63a2f0bbf36b99c2a87648f08467a4eaf92ba726bc7d6a500bbf770c",
     "https://bcr.bazel.build/modules/protobuf/29.0-rc2/MODULE.bazel": "6241d35983510143049943fc0d57937937122baf1b287862f9dc8590fc4c37df",
     "https://bcr.bazel.build/modules/protobuf/29.0-rc3/MODULE.bazel": "33c2dfa286578573afc55a7acaea3cada4122b9631007c594bf0729f41c8de92",
     "https://bcr.bazel.build/modules/protobuf/29.0/MODULE.bazel": "319dc8bf4c679ff87e71b1ccfb5a6e90a6dbc4693501d471f48662ac46d04e4e",
@@ -131,6 +158,8 @@
     "https://bcr.bazel.build/modules/rules_android/0.1.1/source.json": "e6986b41626ee10bdc864937ffb6d6bf275bb5b9c65120e6137d56e6331f089e",
     "https://bcr.bazel.build/modules/rules_apple/3.16.0/MODULE.bazel": "0d1caf0b8375942ce98ea944be754a18874041e4e0459401d925577624d3a54a",
     "https://bcr.bazel.build/modules/rules_apple/3.16.0/source.json": "d8b5fe461272018cc07cfafce11fe369c7525330804c37eec5a82f84cd475366",
+    "https://bcr.bazel.build/modules/rules_bazel_integration_test/0.36.0/MODULE.bazel": "80e7595ab3a92ecd32f3cb00a60df6018e9eb1b2a2a3d5aa68d908514d0c6c69",
+    "https://bcr.bazel.build/modules/rules_bazel_integration_test/0.36.0/source.json": "928bead08b5cf296bc0abd11f86989b13758891cfb7925885dde9c006a0c5b2f",
     "https://bcr.bazel.build/modules/rules_buf/0.1.1/MODULE.bazel": "6189aec18a4f7caff599ad41b851ab7645d4f1e114aa6431acf9b0666eb92162",
     "https://bcr.bazel.build/modules/rules_cc/0.0.1/MODULE.bazel": "cb2aa0747f84c6c3a78dad4e2049c154f08ab9d166b1273835a8174940365647",
     "https://bcr.bazel.build/modules/rules_cc/0.0.10/MODULE.bazel": "ec1705118f7eaedd6e118508d3d26deba2a4e76476ada7e0e3965211be012002",
@@ -144,6 +173,7 @@
     "https://bcr.bazel.build/modules/rules_cc/0.0.8/MODULE.bazel": "964c85c82cfeb6f3855e6a07054fdb159aced38e99a5eecf7bce9d53990afa3e",
     "https://bcr.bazel.build/modules/rules_cc/0.0.9/MODULE.bazel": "836e76439f354b89afe6a911a7adf59a6b2518fafb174483ad78a2a2fde7b1c5",
     "https://bcr.bazel.build/modules/rules_cc/0.1.1/MODULE.bazel": "2f0222a6f229f0bf44cd711dc13c858dad98c62d52bd51d8fc3a764a83125513",
+    "https://bcr.bazel.build/modules/rules_cc/0.1.5/MODULE.bazel": "88dfc9361e8b5ae1008ac38f7cdfd45ad738e4fa676a3ad67d19204f045a1fd8",
     "https://bcr.bazel.build/modules/rules_cc/0.2.6/MODULE.bazel": "b700c99fb8d0c4016c6c05314d15c8964c770ae8e4430f4798619d5044cedbdc",
     "https://bcr.bazel.build/modules/rules_cc/0.2.6/source.json": "1340464525aeea011f7443e20a1131509efe13d70aa7067ebb3ed066a8241732",
     "https://bcr.bazel.build/modules/rules_foreign_cc/0.9.0/MODULE.bazel": "c9e8c682bf75b0e7c704166d79b599f93b72cfca5ad7477df596947891feeef6",
@@ -152,9 +182,16 @@
     "https://bcr.bazel.build/modules/rules_go/0.33.0/MODULE.bazel": "a2b11b64cd24bf94f57454f53288a5dacfe6cb86453eee7761b7637728c1910c",
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+          [
+            "buildifier_prebuilt+",
+            "bazel_skylib",
+            "bazel_skylib+"
+          ],
+          [
+            "buildifier_prebuilt+",
+            "bazel_tools",
+            "bazel_tools"
+          ]
+        ]
+      }
+    },
+    "@@cgrindel_bazel_starlib+//tools/git:extensions.bzl%local_git_ext": {
+      "general": {
+        "bzlTransitiveDigest": "Q/NQyKFI2DljjsevKbLpWlOrT/bOsP3m/A8uvcXQb40=",
+        "usagesDigest": "5zd5+gqyJvnXmzX8mdFsq6JECgvc5t9vLr5rvLkKN+k=",
+        "recordedFileInputs": {},
+        "recordedDirentsInputs": {},
+        "envVariables": {},
+        "generatedRepoSpecs": {
+          "bazel_starlib_git_toolchains": {
+            "repoRuleId": "@@cgrindel_bazel_starlib+//tools/git:local_git.bzl%local_git",
+            "attributes": {}
+          }
+        },
+        "recordedRepoMappingEntries": []
+      }
+    },
     "@@hedron_compile_commands+//:workspace_setup.bzl%hedron_compile_commands_extension": {
       "general": {
         "bzlTransitiveDigest": "ETG38zSsY5oO3BJOxG49tKRtht7UfAoeny++EJtBjkw=",
@@ -514,6 +718,79 @@
         ]
       }
     },
+    "@@rules_bazel_integration_test+//:extensions.bzl%bazel_binaries": {
+      "general": {
+        "bzlTransitiveDigest": "XC9nqZ31LIbq8N7cEK+rYa2iXNQLcJ3cyGWw+zPZlc0=",
+        "usagesDigest": "RrecFjPqzJLKAa/4fc/aVuGbyA3Bw93/Kw8qAVu6JSo=",
+        "recordedFileInputs": {},
+        "recordedDirentsInputs": {},
+        "envVariables": {},
+        "generatedRepoSpecs": {
+          "bazel_binaries_bazelisk": {
+            "repoRuleId": "@@rules_bazel_integration_test+//bazel_integration_test/private:bazel_binaries.bzl%bazelisk_binary",
+            "attributes": {
+              "version": "1.26.0"
+            }
+          },
+          "build_bazel_bazel_.bazelversion": {
+            "repoRuleId": "@@rules_bazel_integration_test+//bazel_integration_test/private:bazel_binaries.bzl%bazel_binary",
+            "attributes": {
+              "version_file": "@@//:.bazelversion",
+              "bazelisk": "@bazel_binaries_bazelisk//:bazelisk"
+            }
+          },
+          "build_bazel_bazel_latest": {
+            "repoRuleId": "@@rules_bazel_integration_test+//bazel_integration_test/private:bazel_binaries.bzl%bazel_binary",
+            "attributes": {
+              "version": "latest",
+              "bazelisk": "@bazel_binaries_bazelisk//:bazelisk"
+            }
+          },
+          "build_bazel_bazel_last_rc": {
+            "repoRuleId": "@@rules_bazel_integration_test+//bazel_integration_test/private:bazel_binaries.bzl%bazel_binary",
+            "attributes": {
+              "version": "last_rc",
+              "bazelisk": "@bazel_binaries_bazelisk//:bazelisk"
+            }
+          },
+          "bazel_binaries": {
+            "repoRuleId": "@@rules_bazel_integration_test+//bazel_integration_test/bzlmod:bazel_binaries.bzl%_bazel_binaries_helper",
+            "attributes": {
+              "version_to_repo": {
+                "'@@//:.bazelversion'": "build_bazel_bazel_.bazelversion",
+                "latest": "build_bazel_bazel_latest",
+                "last_rc": "build_bazel_bazel_last_rc"
+              },
+              "current_version": "'@@//:.bazelversion'"
+            }
+          }
+        },
+        "moduleExtensionMetadata": {
+          "explicitRootModuleDirectDeps": [],
+          "explicitRootModuleDirectDevDeps": [
+            "bazel_binaries_bazelisk",
+            "build_bazel_bazel_.bazelversion",
+            "build_bazel_bazel_latest",
+            "build_bazel_bazel_last_rc",
+            "bazel_binaries"
+          ],
+          "useAllRepos": "NO",
+          "reproducible": false
+        },
+        "recordedRepoMappingEntries": [
+          [
+            "rules_bazel_integration_test+",
+            "bazel_skylib",
+            "bazel_skylib+"
+          ],
+          [
+            "rules_bazel_integration_test+",
+            "cgrindel_bazel_starlib",
+            "cgrindel_bazel_starlib+"
+          ]
+        ]
+      }
+    },
     "@@rules_fuzzing+//fuzzing/private:extensions.bzl%non_module_dependencies": {
       "general": {
         "bzlTransitiveDigest": "lxvzPQyluk241QRYY81nZHOcv5Id/5U2y6dp42qibis=",
@@ -861,6 +1138,60 @@
         ]
       }
     },
+    "@@tar.bzl+//tar:extensions.bzl%toolchains": {
+      "general": {
+        "bzlTransitiveDigest": "/2afh6fPjq/rcyE/jztQDK3ierehmFFngfvmqyRv72M=",
+        "usagesDigest": "maF8qsAIqeH1ey8pxP0gNZbvJt34kLZvTFeQ0ntrJVA=",
+        "recordedFileInputs": {},
+        "recordedDirentsInputs": {},
+        "envVariables": {},
+        "generatedRepoSpecs": {
+          "bsd_tar_toolchains": {
+            "repoRuleId": "@@tar.bzl+//tar/toolchain:toolchain.bzl%tar_toolchains_repo",
+            "attributes": {
+              "user_repository_name": "bsd_tar_toolchains"
+            }
+          },
+          "bsd_tar_toolchains_darwin_amd64": {
+            "repoRuleId": "@@tar.bzl+//tar/toolchain:platforms.bzl%bsdtar_binary_repo",
+            "attributes": {
+              "platform": "darwin_amd64"
+            }
+          },
+          "bsd_tar_toolchains_darwin_arm64": {
+            "repoRuleId": "@@tar.bzl+//tar/toolchain:platforms.bzl%bsdtar_binary_repo",
+            "attributes": {
+              "platform": "darwin_arm64"
+            }
+          },
+          "bsd_tar_toolchains_linux_amd64": {
+            "repoRuleId": "@@tar.bzl+//tar/toolchain:platforms.bzl%bsdtar_binary_repo",
+            "attributes": {
+              "platform": "linux_amd64"
+            }
+          },
+          "bsd_tar_toolchains_linux_arm64": {
+            "repoRuleId": "@@tar.bzl+//tar/toolchain:platforms.bzl%bsdtar_binary_repo",
+            "attributes": {
+              "platform": "linux_arm64"
+            }
+          },
+          "bsd_tar_toolchains_windows_amd64": {
+            "repoRuleId": "@@tar.bzl+//tar/toolchain:platforms.bzl%bsdtar_binary_repo",
+            "attributes": {
+              "platform": "windows_amd64"
+            }
+          },
+          "bsd_tar_toolchains_windows_arm64": {
+            "repoRuleId": "@@tar.bzl+//tar/toolchain:platforms.bzl%bsdtar_binary_repo",
+            "attributes": {
+              "platform": "windows_arm64"
+            }
+          }
+        },
+        "recordedRepoMappingEntries": []
+      }
+    },
     "@@tree-sitter-bazel+//:extensions.bzl%tree_sitter_source_code": {
       "general": {
         "bzlTransitiveDigest": "rNrgpnNDI9R9A9T4s43fAzagKIEdj9tmYTfKzHLEMPI=",

examples/BUILD

@@ -2,6 +2,13 @@
 # Exceptions. See /LICENSE for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
+load("@bazel_binaries//:defs.bzl", "bazel_binaries")
+load(
+    "@rules_bazel_integration_test//bazel_integration_test:defs.bzl",
+    "bazel_integration_tests",
+    "integration_test_utils",
+)
+load("@rules_python//python:defs.bzl", "py_binary")
 load("//bazel/carbon_rules:defs.bzl", "carbon_binary")
 
 carbon_binary(
@@ -13,3 +20,67 @@ carbon_binary(
     name = "hello_world",
     srcs = ["hello_world.carbon"],
 )
+
+py_binary(
+    name = "bazel_test_runner",
+    testonly = True,
+    srcs = ["bazel_test_runner.py"],
+    data = ["//toolchain/install:install_data"],
+    deps = [
+        "@bazel_tools//tools/python/runfiles",
+        "@rules_bazel_integration_test//bazel_integration_test/py:test_base",
+    ],
+)
+
+bazel_example_files = [
+    "bazel/BUILD",
+    "bazel/MODULE.bazel",
+    "bazel/example_lib.h",
+    "bazel/example_lib.cpp",
+    "bazel/example.cpp",
+]
+
+bazel_integration_tests(
+    name = "bazel_min_test",
+    bazel_binaries = bazel_binaries,
+    bazel_versions = bazel_binaries.versions.all,
+    # Override the default tags which assume a much more expensive test.
+    tags = [],
+    test_runner = ":bazel_test_runner",
+    workspace_files = bazel_example_files,
+    workspace_path = "bazel",
+)
+
+bazel_integration_tests(
+    name = "bazel_full_test",
+    bazel_binaries = bazel_binaries,
+    bazel_versions = bazel_binaries.versions.all,
+    env = {"CARBON_BAZEL_TEST_FULL": ""},
+    # Override the default tags -- while running these manually is good as the
+    # full tests are very expensive, there isn't a reason to run them
+    # _exclusively_ as well.
+    tags = ["manual"],
+    test_runner = ":bazel_test_runner",
+    workspace_files = bazel_example_files,
+    workspace_path = "bazel",
+)
+
+# Convenience test suites with a simple names to run all the different
+# configured Bazel versions of tests.
+test_suite(
+    name = "bazel_min_tests",
+    tests = integration_test_utils.bazel_integration_test_names(
+        "bazel_min_test",
+        bazel_binaries.versions.all,
+    ),
+)
+
+test_suite(
+    name = "bazel_full_tests",
+    # Full tests are too expensive to run by default.
+    tags = ["manual"],
+    tests = integration_test_utils.bazel_integration_test_names(
+        "bazel_full_test",
+        bazel_binaries.versions.all,
+    ),
+)

examples/bazel/BUILD

@@ -10,12 +10,21 @@
 # For more details about how to manually interact with this example, please see
 # the adjacent `MODULES.bazel` file.
 
-load("@rules_cc//cc:defs.bzl", "cc_binary")
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
 
-cc_binary(
-    name = "example",
+cc_library(
+    name = "example_lib",
     srcs = [
-        "example.cpp",
-        "example.h",
+        "example_lib.cpp",
+        "example_lib.h",
     ],
+    # We force static linking here so we can test compilation without performing
+    # a full link that is more expensive with runtimes on demand.
+    linkstatic = 1,
+)
+
+cc_binary(
+    name = "example",
+    srcs = ["example.cpp"],
+    deps = [":example_lib"],
 )

examples/bazel/example.cpp

@@ -2,13 +2,9 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-#include "example.h"
-
 #include <stdlib.h>
 
-#include <iostream>
-
-auto HelloWorld() -> void { std::cout << "Hello World!\n"; }
+#include "example_lib.h"
 
 auto main() -> int {
   HelloWorld();

examples/bazel/example_lib.cpp

@@ -0,0 +1,9 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#include "example_lib.h"
+
+#include <iostream>
+
+auto HelloWorld() -> void { std::cout << "Hello World!\n"; }

examples/bazel/example.h → examples/bazel/example_lib.h

@@ -2,9 +2,9 @@
 // Exceptions. See /LICENSE for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-#ifndef CARBON_EXAMPLES_BAZEL_EXAMPLE_H_
-#define CARBON_EXAMPLES_BAZEL_EXAMPLE_H_
+#ifndef CARBON_EXAMPLES_BAZEL_EXAMPLE_LIB_H_
+#define CARBON_EXAMPLES_BAZEL_EXAMPLE_LIB_H_
 
 auto HelloWorld() -> void;
 
-#endif  // CARBON_EXAMPLES_BAZEL_EXAMPLE_H_
+#endif  // CARBON_EXAMPLES_BAZEL_EXAMPLE_LIB_H_

examples/bazel_test_runner.py

@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+
+"""Checks various LLVM tool symlinks behave as expected."""
+
+__copyright__ = """
+Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+Exceptions. See /LICENSE for license information.
+SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+"""
+
+import os
+import sys
+import unittest
+from bazel_tools.tools.python.runfiles import runfiles
+from bazel_integration_test.py import test_base
+
+
+class BazelExampleTest(test_base.TestBase):
+    def setUp(self) -> None:
+        test_base.TestBase.setUp(self)
+        self.runfiles = runfiles.Create()
+        self.install_module = self.runfiles.Rlocation(
+            "carbon/toolchain/install/prefix/lib/carbon"
+        )
+        self.startup_flags = [
+            "--ignore_all_rc_files",
+            "--batch",
+        ]
+        self.flags = [
+            f"--override_module=carbon_toolchain={self.install_module}"
+        ]
+
+    def log_lines(self, lines: list[str]) -> None:
+        for line in lines:
+            print(line, file=sys.stderr)
+
+    def test_compile_lib(self) -> None:
+        # TODO: Can remove this if we can make linking a binary sufficiently
+        # efficient.
+        exit_code, stdout, stderr = self.RunBazel(
+            self.startup_flags + ["build"] + self.flags + ["//:example_lib"]
+        )
+        self.log_lines(stderr)
+        self.AssertExitCode(exit_code, 0, stderr)
+
+    @unittest.skipUnless(
+        "CARBON_BAZEL_TEST_FULL" in os.environ,
+        "Skipping expensive test step for minimal testing",
+    )
+    def test_run(self) -> None:
+        exit_code, stdout, stderr = self.RunBazel(
+            self.startup_flags + ["run"] + self.flags + ["//:example"]
+        )
+        self.log_lines(stderr)
+        self.AssertExitCode(exit_code, 0, stderr)
+        self.assertEqual(stdout, ["Hello World!"])
+
+
+if __name__ == "__main__":
+    unittest.main()