Added unit tests for rustdoc rules

test/unit/rustdoc/BUILD.bazel

@@ -0,0 +1,5 @@
+load(":rustdoc_unit_test.bzl", "rustdoc_test_suite")
+
+rustdoc_test_suite(
+    name = "rustdoc_test_suite",
+)

test/unit/rustdoc/rustdoc_bin.rs

@@ -0,0 +1 @@
+fn main() {}

test/unit/rustdoc/rustdoc_lib.rs

@@ -0,0 +1,25 @@
+#[cfg(feature = "with_proc_macro")]
+use rustdoc_proc_macro::make_answer;
+
+#[cfg(feature = "with_proc_macro")]
+make_answer!();
+
+/// The answer to the ultimate question
+/// ```
+/// fn answer() -> u32 { 42 }
+/// assert_eq!(answer(), 42);
+/// ```
+#[cfg(not(feature = "with_proc_macro"))]
+pub fn answer() -> u32 {
+    42
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn test_answer() {
+        assert_eq!(answer(), 42);
+    }
+}

test/unit/rustdoc/rustdoc_proc_macro.rs

@@ -0,0 +1,14 @@
+use proc_macro::TokenStream;
+
+#[proc_macro]
+pub fn make_answer(_item: TokenStream) -> TokenStream {
+    "\
+/// A procedural macro example:
+/// ```
+/// fn answer() -> u32 { 42 }
+/// assert_eq!(answer(), 42);
+/// ```
+pub fn answer() -> u32 { 42 }"
+        .parse()
+        .unwrap()
+}

test/unit/rustdoc/rustdoc_unit_test.bzl

@@ -0,0 +1,197 @@
+"""Unittest to verify properties of rustdoc rules"""
+
+load("@bazel_skylib//lib:unittest.bzl", "analysistest")
+load("@rules_cc//cc:defs.bzl", "cc_library")
+load("//rust:defs.bzl", "rust_binary", "rust_doc", "rust_doc_test", "rust_library", "rust_proc_macro", "rust_test")
+load(
+    "//test/unit:common.bzl",
+    "assert_action_mnemonic",
+    "assert_argv_contains_prefix_not",
+)
+
+def _common_rustdoc_checks(env, tut):
+    actions = tut.actions
+    action = actions[0]
+    assert_action_mnemonic(env, action, "Rustdoc")
+
+    # These flags, while required for `Rustc` actions, should be omitted for
+    # `Rustdoc` actions
+    assert_argv_contains_prefix_not(env, action, "--remap-path-prefix")
+    assert_argv_contains_prefix_not(env, action, "--emit")
+
+def _rustdoc_for_lib_test_impl(ctx):
+    env = analysistest.begin(ctx)
+    tut = analysistest.target_under_test(env)
+
+    _common_rustdoc_checks(env, tut)
+
+    return analysistest.end(env)
+
+def _rustdoc_for_bin_test_impl(ctx):
+    env = analysistest.begin(ctx)
+    tut = analysistest.target_under_test(env)
+
+    _common_rustdoc_checks(env, tut)
+
+    return analysistest.end(env)
+
+def _rustdoc_for_proc_macro_test_impl(ctx):
+    env = analysistest.begin(ctx)
+    tut = analysistest.target_under_test(env)
+
+    _common_rustdoc_checks(env, tut)
+
+    return analysistest.end(env)
+
+def _rustdoc_for_lib_with_proc_macro_test_impl(ctx):
+    env = analysistest.begin(ctx)
+    tut = analysistest.target_under_test(env)
+
+    _common_rustdoc_checks(env, tut)
+
+    return analysistest.end(env)
+
+def _rustdoc_for_bin_with_transitive_proc_macro_test_impl(ctx):
+    env = analysistest.begin(ctx)
+    tut = analysistest.target_under_test(env)
+
+    _common_rustdoc_checks(env, tut)
+
+    return analysistest.end(env)
+
+def _rustdoc_for_lib_with_cc_lib_test_impl(ctx):
+    env = analysistest.begin(ctx)
+    tut = analysistest.target_under_test(env)
+
+    _common_rustdoc_checks(env, tut)
+
+    return analysistest.end(env)
+
+rustdoc_for_lib_test = analysistest.make(_rustdoc_for_lib_test_impl)
+rustdoc_for_bin_test = analysistest.make(_rustdoc_for_bin_test_impl)
+rustdoc_for_proc_macro_test = analysistest.make(_rustdoc_for_proc_macro_test_impl)
+rustdoc_for_lib_with_proc_macro_test = analysistest.make(_rustdoc_for_lib_with_proc_macro_test_impl)
+rustdoc_for_bin_with_transitive_proc_macro_test = analysistest.make(_rustdoc_for_bin_with_transitive_proc_macro_test_impl)
+rustdoc_for_lib_with_cc_lib_test = analysistest.make(_rustdoc_for_lib_with_cc_lib_test_impl)
+
+def _target_maker(rule_fn, name, **kwargs):
+    rule_fn(
+        name = name,
+        **kwargs
+    )
+
+    rust_test(
+        name = "{}_test".format(name),
+        crate = ":{}".format(name),
+    )
+
+    rust_doc(
+        name = "{}_doc".format(name),
+        crate = ":{}".format(name),
+    )
+
+    rust_doc_test(
+        name = "{}_doctest".format(name),
+        crate = ":{}".format(name),
+    )
+
+def _define_targets():
+    _target_maker(
+        rust_binary,
+        name = "bin",
+        srcs = ["rustdoc_bin.rs"],
+    )
+
+    _target_maker(
+        rust_library,
+        name = "lib",
+        srcs = ["rustdoc_lib.rs"],
+    )
+
+    _target_maker(
+        rust_proc_macro,
+        name = "rustdoc_proc_macro",
+        srcs = ["rustdoc_proc_macro.rs"],
+        edition = "2018",
+    )
+
+    _target_maker(
+        rust_library,
+        name = "lib_with_proc_macro",
+        srcs = ["rustdoc_lib.rs"],
+        proc_macro_deps = [":rustdoc_proc_macro"],
+        crate_features = ["with_proc_macro"],
+    )
+
+    _target_maker(
+        rust_binary,
+        name = "bin_with_transitive_proc_macro",
+        srcs = ["rustdoc_bin.rs"],
+        deps = [":lib_with_proc_macro"],
+        proc_macro_deps = [":rustdoc_proc_macro"],
+        crate_features = ["with_proc_macro"],
+    )
+
+    cc_library(
+        name = "cc_lib",
+        hdrs = ["rustdoc.h"],
+        srcs = ["rustdoc.cc"],
+    )
+
+    _target_maker(
+        rust_library,
+        name = "lib_with_cc",
+        srcs = ["rustdoc_lib.rs"],
+        crate_features = ["with_cc"],
+        deps = [":cc_lib"],
+    )
+
+def rustdoc_test_suite(name):
+    """Entry-point macro called from the BUILD file.
+
+    Args:
+        name (str): Name of the macro.
+    """
+
+    _define_targets()
+
+    rustdoc_for_lib_test(
+        name = "rustdoc_for_lib_test",
+        target_under_test = ":lib_doc",
+    )
+
+    rustdoc_for_bin_test(
+        name = "rustdoc_for_bin_test",
+        target_under_test = ":bin_doc",
+    )
+
+    rustdoc_for_proc_macro_test(
+        name = "rustdoc_for_proc_macro_test",
+        target_under_test = ":rustdoc_proc_macro_doc",
+    )
+
+    rustdoc_for_lib_with_proc_macro_test(
+        name = "rustdoc_for_lib_with_proc_macro_test",
+        target_under_test = ":lib_with_proc_macro_doc",
+    )
+
+    rustdoc_for_bin_with_transitive_proc_macro_test(
+        name = "rustdoc_for_bin_with_transitive_proc_macro_test",
+        target_under_test = ":bin_with_transitive_proc_macro_doc",
+    )
+
+    rustdoc_for_lib_with_cc_lib_test(
+        name = "rustdoc_for_lib_with_cc_lib_test",
+        target_under_test = ":lib_with_cc_doc",
+    )
+
+    native.test_suite(
+        name = name,
+        tests = [
+            ":rustdoc_for_lib_test",
+            ":rustdoc_for_bin_test",
+            ":rustdoc_for_proc_macro_test",
+            ":rustdoc_for_lib_with_proc_macro_test",
+            ":rustdoc_for_lib_with_cc_lib_test",
+        ],
+    )