Add a couple of tests for inventory transfer

For now this is just a couple of regression tests for a couple of CC:R
bugs.

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/Inventory_Test.kt

@@ -0,0 +1,69 @@
+package dan200.computercraft.gametest
+
+import dan200.computercraft.api.lua.ObjectArguments
+import dan200.computercraft.core.apis.PeripheralAPI
+import dan200.computercraft.gametest.api.assertContainerExactly
+import dan200.computercraft.gametest.api.sequence
+import dan200.computercraft.gametest.api.thenOnComputer
+import dan200.computercraft.test.core.assertArrayEquals
+import dan200.computercraft.test.core.computer.getApi
+import net.minecraft.core.BlockPos
+import net.minecraft.core.NonNullList
+import net.minecraft.gametest.framework.GameTest
+import net.minecraft.gametest.framework.GameTestHelper
+import net.minecraft.world.item.ItemStack
+import net.minecraft.world.item.Items
+
+class Inventory_Test {
+    /**
+     * Ensures inventory methods check an item is valid before moving it.
+     *
+     * @see <https://github.com/cc-tweaked/cc-restitched/issues/121>
+     */
+    @GameTest(required = false)
+    fun Checks_valid_item(helper: GameTestHelper) = helper.sequence {
+        thenOnComputer {
+            getApi<PeripheralAPI>().call(
+                context,
+                ObjectArguments(
+                    "back",
+                    "callRemote",
+                    "minecraft:barrel_0",
+                    "pushItems",
+                    "minecraft:shulker_box_0",
+                    1,
+                ),
+            ).await().assertArrayEquals(0, message = "Does not move items")
+        }
+        thenExecute {
+            helper.assertContainerExactly(BlockPos(1, 2, 2), listOf())
+            helper.assertContainerExactly(BlockPos(3, 2, 2), listOf(ItemStack(Items.SHULKER_BOX)))
+        }
+    }
+
+    /**
+     * Ensures inventory methods check an item is valid before moving it.
+     *
+     * @see <https://github.com/cc-tweaked/cc-restitched/issues/121>
+     */
+    @GameTest
+    fun Fails_on_full(helper: GameTestHelper) = helper.sequence {
+        thenOnComputer {
+            getApi<PeripheralAPI>().call(
+                context,
+                ObjectArguments(
+                    "back",
+                    "callRemote",
+                    "minecraft:furnace_0",
+                    "pushItems",
+                    "minecraft:barrel_0",
+                    1,
+                ),
+            ).await().assertArrayEquals(0, message = "Does not move items")
+        }
+        thenExecute {
+            helper.assertContainerExactly(BlockPos(1, 2, 2), listOf(ItemStack.EMPTY, ItemStack.EMPTY, ItemStack(Items.IRON_INGOT)))
+            helper.assertContainerExactly(BlockPos(3, 2, 2), NonNullList.withSize(27, ItemStack(Items.POLISHED_ANDESITE)))
+        }
+    }
+}

projects/common/src/testMod/kotlin/dan200/computercraft/gametest/core/TestHooks.kt

@@ -74,6 +74,7 @@ object TestHooks {
         Computer_Test::class.java,
         CraftOs_Test::class.java,
         Disk_Drive_Test::class.java,
+        Inventory_Test::class.java,
         Loot_Test::class.java,
         Modem_Test::class.java,
         Monitor_Test::class.java,