Parse when expressions

1 files changed, 41 insertions, 0 deletions

diff --git a/src/test/java/org/shedlang/compiler/parser/ParserWhenTests.java b/src/test/java/org/shedlang/compiler/parser/ParserWhenTests.java
new file mode 100644
index 00000000..709d7cce
--- /dev/null
+++ b/src/test/java/org/shedlang/compiler/parser/ParserWhenTests.java
@@ -0,0 +1,41 @@
+package org.shedlang.compiler.parser;
+
+import org.junit.jupiter.api.Test;
+
+import static org.shedlang.compiler.ast.untyped.UntypedNodeMatchers.*;
+import static org.shedlang.compiler.parser.ParserTesting.parseString;
+import static org.zwobble.precisely.AssertThat.assertThat;
+import static org.zwobble.precisely.Matchers.isSequence;
+
+public class ParserWhenTests {
+    @Test
+    public void canParseWhen() {
+        var source = """
+            when (x) {
+                is A {
+                    return 4;
+                }
+                is B {
+                }
+            }
+        """;
+
+        var node = parseString(source, Parser::parseTopLevelExpression);
+
+        assertThat(node, isUntypedWhenNode(
+            isUntypedReferenceNode("x"),
+            isSequence(
+                isUntypedWhenCaseNode(
+                    isUntypedTypeLevelReferenceNode("A"),
+                    isUntypedBlockNode(isSequence(
+                        isUntypedFunctionReturnNode(isUntypedIntLiteralNode(4))
+                    ))
+                ),
+                isUntypedWhenCaseNode(
+                    isUntypedTypeLevelReferenceNode("B"),
+                    isUntypedBlockNode(isSequence())
+                )
+            )
+        ));
+    }
+}