test(furvm): add array and slice tests

Refs: #38

furvm/test/test.cpp

@@ -1,16 +1,14 @@
-#include "furlang/arena.hpp"
 #include "furvm/furvm.hpp"
 #include "furvm/thing.hpp"
 
 #include "gtest/gtest.h" // IWYU pragma: keep
+#include <array>
 
 namespace {
 
 // TODO: Basic program tests (e.g. for loops)
 
-TEST(Things, Ops) {
+TEST(ThingOps, Add) {
-    furlang::arena arena;
-
     furvm::thing lhs{ furvm::thing_type{ furvm::thing_type::U32 } };
     lhs.get<furvm::thing_type::u32>() = 6;
     furvm::thing rhs{ furvm::thing_type{ furvm::thing_type::U32 } };
@@ -23,4 +21,37 @@ TEST(Things, Ops) {
     EXPECT_EQ(res.get<furvm::thing_type::u32>(), 6 + 7);
 }
 
+TEST(ThingOps, Array) {
+    furvm::thing_type innerType = { furvm::thing_type::U32 };
+
+    static constexpr std::size_t                                LENGTH = 10;
+    static constexpr std::array<furvm::thing_type::u32, LENGTH> values = { 0, 1, 2, 3, 4, 5, 6, 7, 6, 7 };
+
+    furvm::thing array{ furvm::thing_type{ furvm::thing_type::Array, { &innerType, LENGTH } } };
+    EXPECT_EQ(array.length(), LENGTH);
+    for (std::size_t i = 0; i < LENGTH; ++i) {
+        auto el                          = array.at(i);
+        el.get<furvm::thing_type::u32>() = values[i];
+        EXPECT_EQ(array.at(i).integer(), values[i]);
+    }
+}
+
+TEST(ThingOps, Slice) {
+    furvm::thing_type innerType = { furvm::thing_type::U32 };
+
+    static constexpr std::size_t                                LENGTH = 10;
+    static constexpr std::array<furvm::thing_type::u32, LENGTH> values = { 0, 1, 2, 3, 4, 5, 6, 7, 6, 7 };
+
+    furvm::thing array{ furvm::thing_type{ furvm::thing_type::Array, { &innerType, LENGTH } } };
+    EXPECT_EQ(array.length(), LENGTH);
+    furvm::thing slice = array.slice(0, LENGTH);
+    EXPECT_EQ(slice.length(), LENGTH);
+    for (std::size_t i = 0; i < LENGTH; ++i) {
+        auto el                          = slice.at(i);
+        el.get<furvm::thing_type::u32>() = values[i];
+        EXPECT_EQ(array.at(i).integer(), values[i]);
+        EXPECT_EQ(slice.at(i).integer(), array.at(i).integer());
+    }
+}
+
 } // namespace