Add push-unit instruction

2 files changed, 13 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
index 5bc9f749..c13035b6 100644
--- a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
+++ b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
@@ -124,6 +124,15 @@ public class InstructionSerializerTests {
         assertThat(string, equalTo("(push-string \"\\b\\t\\n\\f\\r\\\"\\\\\")"));
     }
 
+    @Test
+    public void canSerializePushUnit() {
+        var instruction = Instructions.pushUnit();
+
+        var string = serialize(instruction);
+
+        assertThat(string, equalTo("(push-unit)"));
+    }
+
     private String serialize(Instruction instruction) {
         var builder = new StringBuilder();
         InstructionSerializer.serialize(instruction, builder);
diff --git a/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java b/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
index ba55e28a..cb147883 100644
--- a/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
+++ b/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
@@ -44,4 +44,8 @@ public class Instructions {
     public static Instruction pushString(String value) {
         return new PushStringInstruction(value, Sources.NULL);
     }
+
+    public static Instruction pushUnit() {
+        return new PushUnitInstruction(Sources.NULL);
+    }
 }