Add tests for JavaTypes.bind

2 files changed, 30 insertions, 2 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 900ffe2..f70ee57 100644
--- a/src/main/java/org/zwobble/couscous/frontends/java/JavaTypes.java
+++ b/src/main/java/org/zwobble/couscous/frontends/java/JavaTypes.java
@@ -16,7 +16,7 @@ import static java.util.Arrays.asList;
 import static org.zwobble.couscous.types.Types.erasure;
 import static org.zwobble.couscous.util.ExtraLists.eagerMap;
 
-class JavaTypes {
+public class JavaTypes {
     static Type typeOf(Expression expression) {
         return typeOf(expression.resolveTypeBinding());
     }
@@ -81,7 +81,7 @@ class JavaTypes {
             .filter(type -> !type.equals(Types.OBJECT));
     }
 
-    static Type bind(Type genericType, Type concreteType) {
+    public static Type bind(Type genericType, Type concreteType) {
         if (genericType.equals(concreteType)) {
             return concreteType;
         } else if (!(genericType instanceof TypeParameter)) {
diff --git a/src/test/java/org/zwobble/couscous/tests/frontends/java/JavaTypesTests.java b/src/test/java/org/zwobble/couscous/tests/frontends/java/JavaTypesTests.java
new file mode 100644
index 0000000..ae8d9c0
--- /dev/null
+++ b/src/test/java/org/zwobble/couscous/tests/frontends/java/JavaTypesTests.java
@@ -0,0 +1,28 @@
+package org.zwobble.couscous.tests.frontends.java;
+
+import org.junit.Test;
+import org.zwobble.couscous.frontends.java.JavaTypes;
+import org.zwobble.couscous.types.ScalarType;
+import org.zwobble.couscous.types.TypeParameter;
+
+import static org.junit.Assert.assertEquals;
+import static org.zwobble.couscous.types.BoundTypeParameter.boundTypeParameter;
+import static org.zwobble.couscous.types.TypeParameter.typeParameter;
+
+public class JavaTypesTests {
+    private static final ScalarType INT_TYPE = ScalarType.of("int");
+
+    @Test
+    public void bindingTypeToItselfReturnsType() {
+        assertEquals(
+            INT_TYPE,
+            JavaTypes.bind(INT_TYPE, INT_TYPE));
+    }
+    @Test
+    public void bindingTypeToGenericTypeParameterReturnsBoundTypeParameter() {
+        TypeParameter typeParameter = typeParameter(ScalarType.of("List"), "T");
+        assertEquals(
+            boundTypeParameter(typeParameter, INT_TYPE),
+            JavaTypes.bind(typeParameter, INT_TYPE));
+    }
+}