From 906e88533789cf106f84571e8d61dbc3f55a4641 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Thu, 28 Sep 2023 11:43:44 +0100
Subject: Check type of receiver in field access

---
 .../typechecker/TypeCheckerFieldAccessTests.java   | 28 ++++++++++++++++------
 1 file changed, 21 insertions(+), 7 deletions(-)

(limited to 'src/test/java')

diff --git a/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerFieldAccessTests.java b/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerFieldAccessTests.java
index f560cfce..cb93f758 100644
--- a/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerFieldAccessTests.java
+++ b/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerFieldAccessTests.java
@@ -2,20 +2,19 @@ package org.shedlang.compiler.typechecker;
 
 import org.junit.jupiter.api.Test;
 import org.shedlang.compiler.ast.untyped.Untyped;
-import org.shedlang.compiler.ast.untyped.UntypedCallNode;
-import org.shedlang.compiler.typechecker.errors.*;
-import org.shedlang.compiler.typechecker.typesets.TypeSets;
-import org.shedlang.compiler.types.*;
+import org.shedlang.compiler.typechecker.errors.NoSuchFieldError;
+import org.shedlang.compiler.types.NamespaceName;
+import org.shedlang.compiler.types.StructTypeInfo;
+import org.shedlang.compiler.types.Types;
 import org.shedlang.compiler.util.P;
 
-import java.util.List;
 import java.util.Map;
 
 import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.shedlang.compiler.ast.typed.TypedNodeMatchers.*;
+import static org.shedlang.compiler.ast.typed.TypedNodeMatchers.isTypedFieldAccessNode;
+import static org.shedlang.compiler.ast.typed.TypedNodeMatchers.isTypedReferenceNode;
 import static org.zwobble.precisely.AssertThat.assertThat;
 import static org.zwobble.precisely.Matchers.equalTo;
-import static org.zwobble.precisely.Matchers.isSequence;
 
 public class TypeCheckerFieldAccessTests {
     @Test
@@ -41,4 +40,19 @@ public class TypeCheckerFieldAccessTests {
             )
         );
     }
+
+    @Test
+    public void whenReceiverIsNotStructTypeThenErrorIsReturned() {
+        var untyped = Untyped.fieldAccess(
+            Untyped.reference("user"),
+            "name"
+        );
+        var context = TypeCheckerContext.EMPTY
+            .enterGlobal(P.map(Map.entry("user", Types.STRING)));
+
+        var error = assertThrows(NoSuchFieldError.class, () -> TypeChecker.typeCheckExpression(untyped, context));
+
+        assertThat(error.type(), equalTo(Types.STRING));
+        assertThat(error.fieldName(), equalTo("name"));
+    }
 }
-- 
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