test: port small leaf tests (config, filters, platform, formatter)

Port DefaultConfigTest, IgnoreAll/IgnoreNothingPlatformRequirementFilterTest,
PlatformTest, GitExcludeFilterTest, and HtmlOutputFormatterTest. Each PHP
Test/<Subdir>/ maps to a single integration-test binary via tests/<dir>/main.rs
(the target is named after the directory) whose #[test] functions are collected
from the module tree.

Tests that exercise unported library behavior (regex backreferences,
Preg::split, env expansion) are marked #[ignore].

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/crates/shirabe/tests/util/platform_test.rs b/crates/shirabe/tests/util/platform_test.rs
index 90ce6ad..3d00370 100644
--- a/crates/shirabe/tests/util/platform_test.rs
+++ b/crates/shirabe/tests/util/platform_test.rs
@@ -1 +1,31 @@
 //! ref: composer/tests/Composer/Test/Util/PlatformTest.php
+
+use shirabe::util::platform::Platform;
+use shirabe_php_shim::defined;
+
+#[test]
+#[ignore = "Platform::expand_path does not read the env var set via put_env in this runtime"]
+fn test_expand_path() {
+    Platform::put_env("TESTENV", "/home/test");
+    assert_eq!("/home/test/myPath", Platform::expand_path("%TESTENV%/myPath"));
+    assert_eq!("/home/test/myPath", Platform::expand_path("$TESTENV/myPath"));
+    assert_eq!(
+        format!(
+            "{}/test",
+            Platform::get_env("HOME")
+                .or_else(|| Platform::get_env("USERPROFILE"))
+                .unwrap_or_default()
+        ),
+        Platform::expand_path("~/test")
+    );
+}
+
+#[test]
+fn test_is_windows() {
+    // Compare 2 common tests for Windows to the built-in Windows test
+    assert_eq!(
+        std::path::MAIN_SEPARATOR == '\\',
+        Platform::is_windows()
+    );
+    assert_eq!(defined("PHP_WINDOWS_VERSION_MAJOR"), Platform::is_windows());
+}