Parse empty effect definitions

3 files changed, 69 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/ast/untyped/UntypedEffectDefinitionNodeMatcher.java b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedEffectDefinitionNodeMatcher.java
new file mode 100644
index 00000000..33c64c7d
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedEffectDefinitionNodeMatcher.java
@@ -0,0 +1,41 @@
+package org.shedlang.compiler.ast.untyped;
+
+import org.pcollections.PVector;
+import org.shedlang.compiler.testing.MatcherBuilder;
+import org.shedlang.compiler.util.P;
+import org.zwobble.precisely.Matcher;
+
+import static org.zwobble.precisely.Matchers.equalTo;
+import static org.zwobble.precisely.Matchers.has;
+
+public class UntypedEffectDefinitionNodeMatcher extends MatcherBuilder<
+    UntypedNamespaceStatementNode,
+    UntypedEffectDefinitionNode,
+    UntypedEffectDefinitionNodeMatcher
+> {
+    public static UntypedEffectDefinitionNodeMatcher empty() {
+        return new UntypedEffectDefinitionNodeMatcher(P.vector());
+    }
+
+    public UntypedEffectDefinitionNodeMatcher(
+        PVector<Matcher<? super UntypedEffectDefinitionNode>> submatchers
+    ) {
+        super(submatchers);
+    }
+
+    @Override
+    protected Class<UntypedEffectDefinitionNode> expectedType() {
+        return UntypedEffectDefinitionNode.class;
+    }
+
+    @Override
+    protected UntypedEffectDefinitionNodeMatcher create(
+        PVector<Matcher<? super UntypedEffectDefinitionNode>> submatchers
+    ) {
+        return new UntypedEffectDefinitionNodeMatcher(submatchers);
+    }
+
+    public UntypedEffectDefinitionNodeMatcher withName(String name) {
+        return with(has("name", x -> x.name(), equalTo(name)));
+    }
+}
diff --git a/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java
index 4810f7e7..cadf11f8 100644
--- a/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java
+++ b/src/test/java/org/shedlang/compiler/ast/untyped/UntypedNodeMatchers.java
@@ -84,6 +84,10 @@ public class UntypedNodeMatchers {
         );
     }
 
+    public static UntypedEffectDefinitionNodeMatcher isUntypedEffectDefinitionNode() {
+        return UntypedEffectDefinitionNodeMatcher.empty();
+    }
+
     public static Matcher<UntypedExpressionNode> isUntypedEqualsNode(
         Matcher<UntypedExpressionNode> left,
         Matcher<UntypedExpressionNode> right
diff --git a/src/test/java/org/shedlang/compiler/parser/ParserEffectDefinitionTests.java b/src/test/java/org/shedlang/compiler/parser/ParserEffectDefinitionTests.java
new file mode 100644
index 00000000..e697c542
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/parser/ParserEffectDefinitionTests.java
@@ -0,0 +1,24 @@
+package org.shedlang.compiler.parser;
+
+import org.junit.jupiter.api.Test;
+
+import static org.shedlang.compiler.ast.untyped.UntypedNodeMatchers.isUntypedEffectDefinitionNode;
+import static org.shedlang.compiler.parser.ParserTesting.parseString;
+import static org.zwobble.precisely.AssertThat.assertThat;
+
+public class ParserEffectDefinitionTests {
+    @Test
+    public void canParseEffectWithNoFunctions() {
+        var source = """
+            effect State {
+            }""";
+
+        var node = parseString(source, Parser::parseNamespaceStatement);
+
+        assertThat(
+            node,
+            isUntypedEffectDefinitionNode()
+                .withName("State")
+        );
+    }
+}