add tests

bazel build //test/internal/custom_toolchain:test_toolchain

Author: Karim Alweheshy

test/internal/custom_toolchain/BUILD

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+load("//xcodeproj/internal:custom_toolchain.bzl", "custom_toolchain")
+
+# Example swiftc override for testing
+filegroup(
+    name = "test_swiftc",
+    srcs = ["test_swiftc.sh"],
+    visibility = ["//visibility:public"],
+)
+
+# Test target for custom_toolchain
+custom_toolchain(
+    name = "test_toolchain",
+    toolchain_name = "TestCustomToolchain",
+    overrides = {
+        # Key is a label target, value is the tool name
+        ":test_swiftc": "swiftc",
+    },
+)
+
+# Add a simple test rule that depends on the toolchain
+sh_test(
+    name = "custom_toolchain_test",
+    srcs = ["custom_toolchain_test.sh"],
+    data = [":test_toolchain"],
+    args = ["$(location :test_toolchain)"],
+)

test/internal/custom_toolchain/custom_toolchain_test.sh

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+#!/bin/bash
+
+set -euo pipefail
+
+# The first argument should be the path to the toolchain directory
+TOOLCHAIN_DIR="$1"
+
+echo "Verifying toolchain at: $TOOLCHAIN_DIR"
+
+# Check that the toolchain directory exists
+if [[ ! -d "$TOOLCHAIN_DIR" ]]; then
+  echo "ERROR: Toolchain directory does not exist: $TOOLCHAIN_DIR"
+  exit 1
+fi
+
+# Check that ToolchainInfo.plist exists
+if [[ ! -f "$TOOLCHAIN_DIR/ToolchainInfo.plist" ]]; then
+  echo "ERROR: ToolchainInfo.plist not found in toolchain"
+  exit 1
+fi
+
+# Check for correct identifiers in the plist
+if ! grep -q "BazelRulesXcodeProj" "$TOOLCHAIN_DIR/ToolchainInfo.plist"; then
+  echo "ERROR: ToolchainInfo.plist doesn't contain BazelRulesXcodeProj"
+  exit 1
+fi
+
+# Check that our custom swiftc is properly linked/copied
+if [[ ! -f "$TOOLCHAIN_DIR/usr/bin/swiftc" ]]; then
+  echo "ERROR: swiftc not found in toolchain"
+  exit 1
+fi
+
+# Ensure swiftc is executable
+if [[ ! -x "$TOOLCHAIN_DIR/usr/bin/swiftc" ]]; then
+  echo "ERROR: swiftc is not executable"
+  exit 1
+fi
+
+# Test if the swiftc actually runs
+if ! "$TOOLCHAIN_DIR/usr/bin/swiftc" --version > /dev/null 2>&1; then
+  echo "WARN: swiftc doesn't run correctly, but this is expected in tests"
+fi
+
+echo "Custom toolchain validation successful!"
+exit 0

test/internal/custom_toolchain/test_swiftc.sh

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+#!/bin/bash
+
+# This is a test script that simulates a custom Swift compiler
+# It will be used as an override in the custom toolchain
+
+# Print inputs for debugging
+echo "Custom swiftc called with args: $@" >&2
+
+# In a real override, you would do something meaningful with the args
+# For testing, just exit successfully
+exit 0