Fix printouts crashing in item frames

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

@@ -63,7 +63,7 @@ class Monitor_Test {
     }
 
     /**
-     * Test
+     * Test monitors render correctly
      */
     @GameTestGenerator
     fun Render_monitor_tests(): List<TestFunction> {
@@ -72,7 +72,7 @@ class Monitor_Test {
         fun addTest(label: String, renderer: MonitorRenderer, time: Long = Times.NOON, tag: String = TestTags.CLIENT) {
             if (!TestTags.isEnabled(tag)) return
 
-            val className = Monitor_Test::class.java.simpleName.lowercase()
+            val className = this::class.java.simpleName.lowercase()
             val testName = "$className.render_monitor"
 
             tests.add(

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

@@ -0,0 +1,53 @@
+package dan200.computercraft.gametest
+
+import dan200.computercraft.gametest.api.*
+import net.minecraft.gametest.framework.GameTestGenerator
+import net.minecraft.gametest.framework.GameTestHelper
+import net.minecraft.gametest.framework.TestFunction
+
+class Printout_Test {
+    /**
+     * Test printouts render correctly
+     */
+    @GameTestGenerator
+    fun Render_in_frame(): List<TestFunction> {
+        val tests = mutableListOf<TestFunction>()
+
+        fun addTest(label: String, time: Long = Times.NOON, tag: String = TestTags.CLIENT) {
+            if (!TestTags.isEnabled(tag)) return
+
+            val className = this::class.java.simpleName.lowercase()
+            val testName = "$className.render_in_frame"
+
+            tests.add(
+                TestFunction(
+                    "$testName.$label",
+                    "$testName.$label",
+                    testName,
+                    Timeouts.DEFAULT,
+                    0,
+                    true,
+                ) { renderPrintout(it, time) },
+            )
+        }
+
+        addTest("noon", Times.NOON)
+        addTest("midnight", Times.MIDNIGHT)
+
+        addTest("sodium", tag = "sodium")
+
+        addTest("iris_noon", Times.NOON, tag = "iris")
+        addTest("iris_midnight", Times.MIDNIGHT, tag = "iris")
+
+        return tests
+    }
+
+    private fun renderPrintout(helper: GameTestHelper, time: Long) = helper.sequence {
+        thenExecute {
+            helper.level.dayTime = time
+            helper.positionAtArmorStand()
+        }
+
+        thenScreenshot()
+    }
+}

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

@@ -80,6 +80,7 @@ object TestHooks {
         Monitor_Test::class.java,
         Pocket_Computer_Test::class.java,
         Printer_Test::class.java,
+        Printout_Test::class.java,
         Recipe_Test::class.java,
         Turtle_Test::class.java,
     )