4 files changed, 65 insertions, 0 deletions
diff --git a/src/test/java/org/shedlang/compiler/backends/llvm/LlvmCodeGenIntSubTests.java b/src/test/java/org/shedlang/compiler/backends/llvm/LlvmCodeGenIntSubTests.java
new file mode 100644
index 00000000..dfde4836
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/backends/llvm/LlvmCodeGenIntSubTests.java
@@ -0,0 +1,28 @@
+package org.shedlang.compiler.backends.llvm;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.shedlang.compiler.backends.llvm.ir.ast.LlvmIr;
+import org.shedlang.compiler.stackir.instructions.Instructions;
+import org.shedlang.compiler.testing.snapshots.SnapshotResolver;
+import org.shedlang.compiler.testing.snapshots.Snapshotter;
+
+import java.io.IOException;
+
+import static org.shedlang.compiler.backends.llvm.LlvmCodeGenTesting.serializeContext;
+
+@ExtendWith({SnapshotResolver.class})
+public class LlvmCodeGenIntSubTests {
+    @Test
+    public void intSubIsCompiledToSub(Snapshotter snapshotter) throws IOException {
+        var instruction = Instructions.intSub();
+        var context = LlvmCodeGenContext.EMPTY
+            .push(LlvmIr.variableLocal("a"))
+            .push(LlvmIr.variableLocal("b"))
+            .push(LlvmIr.variableLocal("c"));
+
+        var result = LlvmCodeGen.generateInstruction(instruction, context);
+
+        snapshotter.assertSnapshot(serializeContext(result));
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/backends/wasm/WasmCodeGenIntSubTests.java b/src/test/java/org/shedlang/compiler/backends/wasm/WasmCodeGenIntSubTests.java
new file mode 100644
index 00000000..f394d823
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/backends/wasm/WasmCodeGenIntSubTests.java
@@ -0,0 +1,24 @@
+package org.shedlang.compiler.backends.wasm;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.shedlang.compiler.stackir.instructions.Instructions;
+import org.shedlang.compiler.testing.snapshots.SnapshotResolver;
+import org.shedlang.compiler.testing.snapshots.Snapshotter;
+
+import java.io.IOException;
+
+import static org.shedlang.compiler.backends.wasm.WasmCodeGenTesting.objdumpContext;
+
+@ExtendWith({SnapshotResolver.class})
+public class WasmCodeGenIntSubTests {
+    @Test
+    public void intSubIsCompiledToI32Sub(Snapshotter snapshotter) throws IOException, InterruptedException {
+        var instruction = Instructions.intSub();
+        var context = WasmCodeGenContext.EMPTY;
+
+        var result = WasmCodeGen.generateInstruction(instruction, context);
+
+        snapshotter.assertSnapshot(objdumpContext(result));
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
index 3f8398cc..c6046847 100644
--- a/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
+++ b/src/test/java/org/shedlang/compiler/stackir/InstructionSerializerTests.java
@@ -103,6 +103,15 @@ public class InstructionSerializerTests {
     }
 
     @Test
+    public void canSerializeIntSub() {
+        var instruction = Instructions.intSub();
+
+        var string = serialize(instruction);
+
+        assertThat(string, equalTo("(int-sub)"));
+    }
+
+    @Test
     public void canSerializeLocalLoad() {
         var instruction = Instructions.localLoad("x");
 
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 5b155878..6f769591 100644
--- a/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
+++ b/src/test/java/org/shedlang/compiler/stackir/instructions/Instructions.java
@@ -34,6 +34,10 @@ public class Instructions {
         return new IntNotEqualInstruction(Sources.NULL);
     }
 
+    public static Instruction intSub() {
+        return new IntSubInstruction(Sources.NULL);
+    }
+
     public static Instruction localLoad(String name) {
         return new LocalLoadInstruction(name, Sources.NULL);
     }