Compile int literal to stack instruction

2 files changed, 30 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/stackir/StackCompilerIntLiteralTests.java b/src/test/java/org/shedlang/compiler/stackir/StackCompilerIntLiteralTests.java
new file mode 100644
index 00000000..38448bb9
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/stackir/StackCompilerIntLiteralTests.java
@@ -0,0 +1,21 @@
+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.isPushIntInstruction;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.isSequence;
+
+public class StackCompilerIntLiteralTests {
+    @Test
+    public void intLiteralIsCompiledToPushIntInstruction() {
+        var node = Typed.intLiteral(42);
+
+        var instructions = StackCompiler.compileExpression(node);
+
+        assertThat(instructions, isSequence(
+            isPushIntInstruction(42)
+        ));
+    }
+}
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 7b90c614..053cf645 100644
--- a/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
+++ b/src/test/java/org/shedlang/compiler/stackir/instructions/InstructionMatchers.java
@@ -2,6 +2,8 @@ package org.shedlang.compiler.stackir.instructions;
 
 import org.zwobble.precisely.Matcher;
 
+import java.math.BigInteger;
+
 import static org.zwobble.precisely.Matchers.*;
 
 public class InstructionMatchers {
@@ -14,4 +16,11 @@ public class InstructionMatchers {
             has("value", x -> x.value(), equalTo(value))
         );
     }
+
+    public static Matcher<Instruction> isPushIntInstruction(int value) {
+        return instanceOf(
+            PushIntInstruction.class,
+            has("value", x -> x.value(), equalTo(BigInteger.valueOf(value)))
+        );
+    }
 }