2 files changed, 30 insertions, 0 deletions
diff --git a/src/test/java/org/shedlang/compiler/stackir/StackCompilerIntSubTests.java b/src/test/java/org/shedlang/compiler/stackir/StackCompilerIntSubTests.java
new file mode 100644
index 00000000..b11863c5
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/stackir/StackCompilerIntSubTests.java
@@ -0,0 +1,26 @@
+package org.shedlang.compiler.stackir;
+
+import org.junit.jupiter.api.Test;
+import org.shedlang.compiler.ast.typed.Typed;
+
+import static org.shedlang.compiler.stackir.instructions.InstructionMatchers.*;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.isSequence;
+
+public class StackCompilerIntSubTests {
+    @Test
+    public void intSubIsCompiledToIntSubInstruction() {
+        var node = Typed.intSub(
+            Typed.intLiteral(42),
+            Typed.intLiteral(47)
+        );
+
+        var instructions = StackCompiler.compileExpression(node);
+
+        assertThat(instructions, isSequence(
+            isPushIntInstruction(42),
+            isPushIntInstruction(47),
+            isIntSubInstruction()
+        ));
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java b/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
index 201a69c2..08f02227 100644
--- a/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
+++ b/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
@@ -37,6 +37,10 @@ public class InstructionMatchers {
         return instanceOf(IntAddInstruction.class);
     }
 
+    public static Matcher<Instruction> isIntSubInstruction() {
+        return instanceOf(IntSubInstruction.class);
+    }
+
     public static Matcher<Instruction> isLocalLoadInstruction(String name) {
         return instanceOf(
             LocalLoadInstruction.class,