Add test suite targets for buck and bazel

.travis.yml

@@ -25,6 +25,7 @@ matrix:
       script:
         - buck build :cxx#check --verbose=0
         - buck run demo-rs --verbose=0
+        - buck test ... --verbose=0
     - name: Bazel
       rust: nightly
       before_install:
@@ -36,3 +37,4 @@ matrix:
         - cargo vendor --versioned-dirs --locked third-party/vendor
       script:
         - bazel run demo-rs:demo_rs --verbose_failures --noshow_progress
+        - bazel test ... --verbose_failures --noshow_progress

build/rust.bzl

@@ -2,6 +2,7 @@ load(
     "@io_bazel_rules_rust//rust:rust.bzl",
     _rust_binary = "rust_binary",
     _rust_library = "rust_library",
+    _rust_test = "rust_test",
 )
 
 def rust_binary(edition = "2018", **kwargs):
@@ -17,3 +18,6 @@ def rust_library(edition = "2018", **kwargs):
 def third_party_rust_library(rustc_flags = [], **kwargs):
     rustc_flags = rustc_flags + ["--cap-lints=allow"]
     rust_library(rustc_flags = rustc_flags, **kwargs)
+
+def rust_test(edition = "2018", **kwargs):
+    _rust_test(edition = edition, **kwargs)

tests/BUCK

@@ -0,0 +1,42 @@
+rust_test(
+    name = "test",
+    srcs = ["test.rs"],
+    deps = [":ffi"],
+)
+
+rust_library(
+    name = "ffi",
+    srcs = ["ffi/lib.rs"],
+    crate = "cxx_test_suite",
+    deps = [
+        ":impl",
+        "//:cxx",
+    ],
+)
+
+cxx_library(
+    name = "impl",
+    srcs = [
+        "ffi/tests.cc",
+        ":gen-source",
+    ],
+    headers = {
+        "ffi/lib.rs": ":gen-header",
+        "ffi/tests.h": "ffi/tests.h",
+    },
+    deps = ["//:core"],
+)
+
+genrule(
+    name = "gen-header",
+    srcs = ["ffi/lib.rs"],
+    cmd = "$(exe //:codegen) --header ${SRCS} > ${OUT}",
+    out = "gen.h",
+)
+
+genrule(
+    name = "gen-source",
+    srcs = ["ffi/lib.rs"],
+    cmd = "$(exe //:codegen) ${SRCS} > ${OUT}",
+    out = "gen.cc",
+)

tests/BUILD

@@ -0,0 +1,51 @@
+load("//:build/rust.bzl", "rust_library", "rust_test")
+
+rust_test(
+    name = "test",
+    srcs = ["test.rs"],
+    deps = [":cxx_test_suite"],
+)
+
+rust_library(
+    name = "cxx_test_suite",
+    srcs = ["ffi/lib.rs"],
+    deps = [
+        ":impl",
+        "//:cxx",
+    ],
+)
+
+cc_library(
+    name = "impl",
+    srcs = [
+        "ffi/tests.cc",
+        ":gen-source",
+    ],
+    hdrs = ["ffi/tests.h"],
+    deps = [
+        ":include",
+        "//:core",
+    ],
+)
+
+genrule(
+    name = "gen-header",
+    srcs = ["ffi/lib.rs"],
+    outs = ["lib.rs"],
+    cmd = "$(location //:codegen) --header $< > $@",
+    tools = ["//:codegen"],
+)
+
+genrule(
+    name = "gen-source",
+    srcs = ["ffi/lib.rs"],
+    outs = ["gen.cc"],
+    cmd = "$(location //:codegen) $< > $@",
+    tools = ["//:codegen"],
+)
+
+cc_library(
+    name = "include",
+    hdrs = [":gen-header"],
+    include_prefix = "tests/ffi",
+)