Throw appropriate error on recognised namespace statement

2 files changed, 18 insertions, 1 deletions

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java b/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java
index 12259ad..a80c4bf 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/parser/Parser.java
@@ -112,7 +112,7 @@ public class Parser {
         } else if (tokens.isNext(TokenType.KEYWORD_SUM)) {
             return parseSumDefinition(tokens, docComment);
         } else {
-            throw new UnsupportedOperationException("TODO");
+            throw new UnexpectedTokenError("namespace statement", tokens.peek());
         }
     }
 
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserNamespaceTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserNamespaceTests.java
index ada6414..f749767 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserNamespaceTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/parser/ParserNamespaceTests.java
@@ -4,6 +4,7 @@ import org.junit.jupiter.api.Test;
 import org.zwobble.hobgoblin.compiler.ast.untyped.UntypedStructDefinitionNode;
 import org.zwobble.hobgoblin.compiler.types.NamespaceName;
 
+import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.zwobble.hobgoblin.compiler.ast.untyped.UntypedImportNodeMatcher.isUntypedImportNode;
 import static org.zwobble.hobgoblin.compiler.ast.untyped.UntypedNamespaceNodeMatcher.isUntypedNamespaceNode;
 import static org.zwobble.hobgoblin.compiler.parser.ParserTesting.parseString;
@@ -95,4 +96,20 @@ public class ParserNamespaceTests {
             ))
         );
     }
+
+    @Test
+    public void whenNamespaceStatementIsNotRecognisedThenErrorIsThrown() {
+        var source = "blah";
+
+        var error = assertThrows(
+            UnexpectedTokenError.class,
+            () -> parseString(
+                source,
+                tokens -> Parser.parseNamespace(tokens, NamespaceName.of("Example", "Project"))
+            )
+        );
+
+        assertThat(error.getExpected(), equalTo("namespace statement"));
+        assertThat(error.getActual().charSequence().toString(), equalTo("blah"));
+    }
 }