From add95b14f74e6dbe04a6efe98ff0f20424930b73 Mon Sep 17 00:00:00 2001
From: Stefan Weigl-Bosker <stefan@s00.xyz>
Date: Tue, 3 Feb 2026 14:59:53 -0500
Subject: [willow]: initial frontend work, unit tests (#8)

---
 willow/unittest/BUILD.bazel         |  6 +++++
 willow/unittest/ir/BUILD.bazel      | 16 ++++++++++++
 willow/unittest/ir/VerifierTest.cpp | 51 +++++++++++++++++++++++++++++++++++++
 willow/unittest/willow_unittest.bzl |  8 ++++++
 4 files changed, 81 insertions(+)
 create mode 100644 willow/unittest/BUILD.bazel
 create mode 100644 willow/unittest/ir/BUILD.bazel
 create mode 100644 willow/unittest/ir/VerifierTest.cpp
 create mode 100644 willow/unittest/willow_unittest.bzl

(limited to 'willow/unittest')

diff --git a/willow/unittest/BUILD.bazel b/willow/unittest/BUILD.bazel
new file mode 100644
index 0000000..8f1c55d
--- /dev/null
+++ b/willow/unittest/BUILD.bazel
@@ -0,0 +1,6 @@
+test_suite(
+  name = "unittest",
+  tests = [
+    "//willow/unittest/ir:ir_tests",
+  ]
+)
diff --git a/willow/unittest/ir/BUILD.bazel b/willow/unittest/ir/BUILD.bazel
new file mode 100644
index 0000000..b41dfcd
--- /dev/null
+++ b/willow/unittest/ir/BUILD.bazel
@@ -0,0 +1,16 @@
+cc_test(
+  name = "verifier",
+  srcs = ["VerifierTest.cpp"],
+  deps = [
+    "//willow",
+    "@catch2//:catch2_main"
+  ],
+  tags = ["ir"]
+)
+
+test_suite(
+  name = "ir_tests",
+  tests = [
+    ":verifier"
+  ],
+)
diff --git a/willow/unittest/ir/VerifierTest.cpp b/willow/unittest/ir/VerifierTest.cpp
new file mode 100644
index 0000000..959d72a
--- /dev/null
+++ b/willow/unittest/ir/VerifierTest.cpp
@@ -0,0 +1,51 @@
+#include <catch2/catch_test_macros.hpp>
+
+#include <willow/IR/Context.h>
+#include <willow/IR/Module.h>
+#include <willow/IR/Verifier.h>
+#include <willow/IR/Diagnostic.h>
+#include <willow/IR/DiagnosticEngine.h>
+#include <willow/IR/Function.h>
+
+using namespace willow;
+
+TEST_CASE("valid modules", "[verifier]") {
+  WillowContext ctx;
+  std::vector<Diagnostic> diags;
+  DiagnosticEngine eng(
+      [&](Diagnostic d) { diags.push_back(std::move(d)); });
+
+  auto &m = *ctx.addModule("test");
+  SECTION("empty module") {
+    REQUIRE(succeeded(verifyModule(ctx, m, eng)));
+    REQUIRE(diags.empty());
+  }
+}
+
+TEST_CASE("valid function", "[verifier]") {
+  WillowContext ctx;
+  std::vector<Diagnostic> diags;
+  DiagnosticEngine eng(
+      [&](Diagnostic d) { diags.push_back(std::move(d)); });
+
+  auto &m = *ctx.addModule("test");
+
+  Type fty = ctx.types().FunctionType(ctx.types().VoidType(), {});
+  auto &fn = *m.emplaceFunction("fn", &m, fty);
+
+  REQUIRE(succeeded(verifyFunction(ctx, fn, eng)));
+  REQUIRE(diags.empty());
+}
+
+TEST_CASE("invalid basic block", "[verifier]") {
+  WillowContext ctx;
+  std::vector<Diagnostic> diags;
+  DiagnosticEngine eng(
+      [&](Diagnostic d) { diags.push_back(std::move(d)); });
+
+  auto &m = *ctx.addModule("test");
+
+  Type fty = ctx.types().FunctionType(ctx.types().VoidType(), {});
+  auto &fn = *m.emplaceFunction("fn", &m, fty);
+  // TODO
+}
diff --git a/willow/unittest/willow_unittest.bzl b/willow/unittest/willow_unittest.bzl
new file mode 100644
index 0000000..f1bb102
--- /dev/null
+++ b/willow/unittest/willow_unittest.bzl
@@ -0,0 +1,8 @@
+def willow_unittest(name, srcs, deps = [], tags = [], **kwargs):
+  native.cc_test(
+    name = name,
+    srcs = srcs,
+    deps = deps + ["@catch2//:catch2_main"],
+    tags = tags,
+    **kwargs
+  )
-- 
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