Ensure superclass is first in super type collection

3 files changed, 18 insertions, 1 deletions

diff --git a/src/main/java/org/zwobble/couscous/frontends/java/JavaTypes.java b/src/main/java/org/zwobble/couscous/frontends/java/JavaTypes.java
index 19a9126..226e05d 100644
--- a/src/main/java/org/zwobble/couscous/frontends/java/JavaTypes.java
+++ b/src/main/java/org/zwobble/couscous/frontends/java/JavaTypes.java
@@ -44,10 +44,10 @@ class JavaTypes {
 
     private static Set<TypeName> superTypes(ITypeBinding typeBinding) {
         ImmutableSet.Builder<TypeName> superTypes = ImmutableSet.builder();
+        superTypes.add(superClass(typeBinding));
         superTypes.addAll(transform(
             asList(typeBinding.getInterfaces()),
             JavaTypes::typeOf));
-        superTypes.add(superClass(typeBinding));
         return superTypes.build();
     }
 
diff --git a/src/main/java/org/zwobble/couscous/util/ExtraSets.java b/src/main/java/org/zwobble/couscous/util/ExtraSets.java
index ab3dd16..3012da5 100644
--- a/src/main/java/org/zwobble/couscous/util/ExtraSets.java
+++ b/src/main/java/org/zwobble/couscous/util/ExtraSets.java
@@ -14,4 +14,8 @@ public class ExtraSets {
     public static <T> Set<T> set(T value1) {
         return ImmutableSet.of(value1);
     }
+
+    public static <T> Set<T> set(T value1, T value2) {
+        return ImmutableSet.of(value1, value2);
+    }
 }
diff --git a/src/test/java/org/zwobble/couscous/tests/frontends/java/JavaReaderTests.java b/src/test/java/org/zwobble/couscous/tests/frontends/java/JavaReaderTests.java
index 454dda7..ca2869c 100644
--- a/src/test/java/org/zwobble/couscous/tests/frontends/java/JavaReaderTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/frontends/java/JavaReaderTests.java
@@ -8,6 +8,7 @@ import org.zwobble.couscous.values.StringValue;
 
 import java.util.List;
 
+import static org.hamcrest.Matchers.contains;
 import static org.hamcrest.Matchers.hasSize;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertThat;
@@ -313,6 +314,18 @@ public class JavaReaderTests {
     }
 
     @Test
+    public void canReadInterfaceWithSuperTypes() {
+        String source = "package com.example;" +
+            "public interface Example extends java.util.function.IntSupplier {}";
+        List<TypeNode> classes = readSource("com/example/Example.java", source);
+        assertThat(classes, hasSize(1));
+        InterfaceNode classNode = (InterfaceNode) classes.get(0);
+        assertEquals(TypeName.of("com.example.Example"), classNode.getName());
+        assertEquals(list(), classNode.getMethods());
+        assertThat(classNode.getSuperTypes(), contains(ObjectValues.OBJECT, TypeName.of("java.util.function.IntSupplier")));
+    }
+
+    @Test
     public void canReadInterfaceWithMethod() {
         String source = "package com.example;" +
             "public interface Example {" +