Add the beginnings of a Python backend

1 files changed, 49 insertions, 0 deletions

diff --git a/src/test/java/org/zwobble/couscous/tests/BackendTests.java b/src/test/java/org/zwobble/couscous/tests/BackendTests.java
new file mode 100644
index 0000000..86818af
--- /dev/null
+++ b/src/test/java/org/zwobble/couscous/tests/BackendTests.java
@@ -0,0 +1,49 @@
+package org.zwobble.couscous.tests;
+
+import org.junit.Test;
+import org.zwobble.couscous.ast.ClassNode;
+import org.zwobble.couscous.ast.MethodNode;
+import org.zwobble.couscous.ast.ReturnNode;
+import org.zwobble.couscous.values.InterpreterValue;
+import org.zwobble.couscous.values.StringValue;
+
+import static java.util.Arrays.asList;
+import static org.junit.Assert.assertEquals;
+import static org.zwobble.couscous.ast.LiteralNode.literal;
+import static org.zwobble.couscous.ast.MethodNode.staticMethod;
+import static org.zwobble.couscous.values.UnitValue.UNIT;
+
+import lombok.val;
+
+public abstract class BackendTests {
+    @Test
+    public void methodWithNoStatementsReturnsUnit() {
+        val method = staticMethod("hello");
+        val result = runMethod(method);
+        
+        assertEquals(UNIT, result);
+    }
+    
+    @Test
+    public void canReturnLiteralValue() {
+        val method = staticMethod("hello")
+            .statement(new ReturnNode(literal("hello, world!")));
+        val result = runMethod(method);
+        
+        assertEquals(new StringValue("hello, world!"), result);
+    }
+
+    protected InterpreterValue runMethod(MethodNode.MethodNodeBuilder methodBuilder, InterpreterValue... arguments) {
+        val method = methodBuilder.build();
+        val className = "com.example.Program";
+        val classNode = ClassNode.builder(className)
+            .method(method)
+            .build();
+        
+        val runner = buildMethodRunner();
+        return runner.runMethod(classNode, method.getName(), asList(arguments));
+    }
+    
+    protected abstract MethodRunner buildMethodRunner();
+        
+}