2 files changed, 84 insertions, 0 deletions
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java
index 3ed6e3e..dd3a7f9 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/RustWriterTests.java
@@ -265,6 +265,39 @@ public class RustWriterTests {
             }"""));
     }
 
+    @Test
+    public void emptyTraitImpl() throws IOException {
+        var rust = RustTraitImpl.arbitrary()
+            .withImplementedTrait(RustTypePath.of("Shape"))
+            .withType(RustTypePath.of("Square"))
+            .build();
+
+        var string = write(writer -> writer.writeItem(rust));
+
+        assertThat(string, equalTo("""
+            impl Shape for Square {
+            }"""));
+    }
+
+    @Test
+    public void traitImplWithAssociatedItems() throws IOException {
+        var rust = RustTraitImpl.arbitrary()
+            .withImplementedTrait(RustTypePath.of("Shape"))
+            .withType(RustTypePath.of("Square"))
+            .addItem(RustFunction.arbitrary().withName(new RustIdentifier("width")))
+            .addItem(RustFunction.arbitrary().withName(new RustIdentifier("height")))
+            .build();
+
+        var string = write(writer -> writer.writeItem(rust));
+
+        assertThat(string, equalTo("""
+            impl Shape for Square {
+                pub fn width();
+
+                pub fn height();
+            }"""));
+    }
+
     // == Statements ==
 
     @Test
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTraitImplMatcher.java b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTraitImplMatcher.java
new file mode 100644
index 0000000..a31ac13
--- /dev/null
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/output/lang/rust/ast/RustTraitImplMatcher.java
@@ -0,0 +1,51 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.rust.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher imports
+
+public class RustTraitImplMatcher implements org.zwobble.precisely.Matcher<java.lang.Object> {
+    public static org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher isRustTraitImpl() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher(java.util.List.of());
+    }
+
+    private final java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl>> submatchers;
+
+    private RustTraitImplMatcher(java.util.List<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl>> 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.rust.ast.RustTraitImpl.class, this.submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher withImplementedTrait(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTypePath> implementedTrait) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("implementedTrait", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl::implementedTrait, implementedTrait));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher withType(org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustType> type) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("type", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl::type, type));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher(submatchers);
+    }
+
+    public org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher withItems(org.zwobble.precisely.Matcher<? super java.util.List<org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustAssociatedItem>> items) {
+        var submatchers = new java.util.ArrayList<org.zwobble.precisely.Matcher<? super org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl>>(this.submatchers);
+        submatchers.add(org.zwobble.precisely.Matchers.has("items", org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImpl::items, items));
+        return new org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher(submatchers);
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.rust.ast.RustTraitImplMatcher body
+}