test(dependency-resolver): port PoolTest with shared TestCase helpers

Add tests/common/test_case.rs (get_package, get_version_constraint) ported from
the PHP TestCase, included into the dependency_resolver binary via #[path].
PoolTest's testPool/testPackageById/testWhatProvidesWhenPackageCannotBeFound
pass; testWhatProvidesPackageWithConstraint is #[ignore] (constraint matching
reaches a todo!() in the php-shim).

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

1 files changed, 25 insertions, 0 deletions

diff --git a/crates/shirabe/tests/common/test_case.rs b/crates/shirabe/tests/common/test_case.rs
new file mode 100644
index 0000000..4a54195
--- /dev/null
+++ b/crates/shirabe/tests/common/test_case.rs
@@ -0,0 +1,25 @@
+//! Shared test helpers ported from composer/tests/Composer/Test/TestCase.php.
+//!
+//! Included into each integration-test binary that needs them via
+//! `#[path = "../common/test_case.rs"] mod test_case;`.
+#![allow(dead_code)]
+
+use shirabe::package::handle::{CompletePackageHandle, PackageInterfaceHandle};
+use shirabe_semver::constraint::{AnyConstraint, SimpleConstraint};
+use shirabe_semver::version_parser::VersionParser;
+
+/// ref: TestCase::getPackage (default class CompletePackage)
+pub fn get_package(name: &str, version: &str) -> PackageInterfaceHandle {
+    let norm_version = VersionParser.normalize(version, None).unwrap();
+    CompletePackageHandle::new(name.to_string(), norm_version, version.to_string()).into()
+}
+
+/// ref: TestCase::getVersionConstraint
+pub fn get_version_constraint(operator: &str, version: &str) -> AnyConstraint {
+    let normalized = VersionParser.normalize(version, None).unwrap();
+    AnyConstraint::Simple(SimpleConstraint::new(
+        operator.to_string(),
+        normalized,
+        Some(format!("{} {}", operator, version)),
+    ))
+}