2 files changed, 99 insertions, 0 deletions
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
index 7158062..75a57a6 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/JavaWriterTests.java
@@ -1560,6 +1560,58 @@ public class JavaWriterTests {
         assertThat(string, equalTo("42"));
     }
 
+    // === Lambda expressions ===
+
+    @Test
+    public void lambdaExpressionWithNoParams() throws IOException {
+        var java = JavaLambdaExpression.arbitrary()
+            .build();
+
+        var string = write(writer -> writer.writeTopLevelExpression(java));
+
+        assertThat(string, equalTo("""
+            () -> {
+            }"""));
+    }
+
+    @Test
+    public void lambdaExpressionWithParams() throws IOException {
+        var java = JavaLambdaExpression.arbitrary()
+            .addParam(JavaParam.arbitrary()
+                .withName(JavaIdentifier.of("a"))
+                .withType(JavaTypeRef.local(JavaIdentifier.of("A")))
+            )
+            .addParam(JavaParam.arbitrary()
+                .withName(JavaIdentifier.of("b"))
+                .withType(JavaTypeRef.local(JavaIdentifier.of("B")))
+            )
+            .build();
+
+        var string = write(writer -> writer.writeTopLevelExpression(java));
+
+        assertThat(string, equalTo("""
+            (A a, B b) -> {
+            }"""));
+    }
+
+    @Test
+    public void lambdaExpressionWithBody() throws IOException {
+        var java = JavaLambdaExpression.arbitrary()
+            .withBody(JavaBlock.arbitrary()
+                .addStatement(JavaReturn.arbitrary()
+                    .withValue(JavaIntegerLiteral.arbitrary().withValue(42))
+                )
+            )
+            .build();
+
+        var string = write(writer -> writer.writeTopLevelExpression(java));
+
+        assertThat(string, equalTo("""
+            () -> {
+                return 42;
+            }"""));
+    }
+
     // === Method refs ===
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaLambdaExpressionMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaLambdaExpressionMatcher.java
new file mode 100644
index 0000000..1a9e79a
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/java/ast/JavaLambdaExpressionMatcher.java
@@ -0,0 +1,47 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.java.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher imports
+
+public final class JavaLambdaExpressionMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher isJavaLambdaExpression() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpression>> submatchers;
+
+    private JavaLambdaExpressionMatcher(
+        java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpression>> submatchers
+    ) {
+        this.submatchers = submatchers;
+    }
+
+    public org.zwobble.precisely.MatchResult match(java.lang.Object actual) {
+        return this.toMatcher().match(actual);
+    }
+
+    public org.zwobble.precisely.TextTree describe() {
+        return this.toMatcher().describe();
+    }
+
+    private org.zwobble.precisely.Matcher<java.lang.Object> toMatcher() {
+        return org.zwobble.precisely.Matchers.instanceOf(org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpression.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher withParams(org.zwobble.precisely.Matcher<? super java.util.List<org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaParam>> params) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("params", org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpression::params, params));
+        return new org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher withBody(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaBlock> body) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpression>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("body", org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpression::body, body));
+        return new org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.java.ast.JavaLambdaExpressionMatcher body
+}