Moved cargo_build_script test into appropriate dir. (#3024)

Author: UebelAndre

MODULE.bazel

@@ -110,8 +110,3 @@ use_repo(
     "t3p__serde-1.0.214",
     "t3p__serde_json-1.0.132",
 )
-
-register_toolchains(
-    "//test/foreign_toolchain_make_variables:toolchain_for_test",
-    dev_dependency = True,
-)

WORKSPACE.bazel

@@ -60,5 +60,3 @@ http_archive(
 load("//test/3rdparty/crates:crates.bzl", test_crate_repositories = "crate_repositories")
 
 test_crate_repositories()
-
-register_toolchains("//test/foreign_toolchain_make_variables:toolchain_for_test")

test/cargo_build_script/foreign_toolchain_make_variables/BUILD.bazel

@@ -0,0 +1,17 @@
+load("//cargo:defs.bzl", "cargo_build_script")
+load(":toolchain.bzl", "dummy_env_var_toolchain")
+
+cargo_build_script(
+    name = "bs",
+    srcs = ["build.rs"],
+    build_script_env = {
+        "FROM_TOOLCHAIN": "$(FROM_TOOLCHAIN)",
+        "MODIFIED_FROM_TOOLCHAIN": "modified$(FROM_TOOLCHAIN)",
+    },
+    edition = "2021",
+    toolchains = [":dummy_env_var_toolchain"],
+)
+
+dummy_env_var_toolchain(
+    name = "dummy_env_var_toolchain",
+)

test/foreign_toolchain_make_variables/build.rs renamed to test/cargo_build_script/foreign_toolchain_make_variables/build.rs

@@ -0,0 +1,18 @@
+"""Utilties for testing forwarding Make variables from toolchains."""
+
+def _dummy_env_var_toolchain_impl(_ctx):
+    make_variables = platform_common.TemplateVariableInfo({
+        "ALSO_FROM_TOOLCHAIN": "absent",
+        "FROM_TOOLCHAIN": "present",
+    })
+
+    return [
+        platform_common.ToolchainInfo(
+            make_variables = make_variables,
+        ),
+        make_variables,
+    ]
+
+dummy_env_var_toolchain = rule(
+    implementation = _dummy_env_var_toolchain_impl,
+)