From c708986f7ac7a44789b38e198326a8cf9c98e454 Mon Sep 17 00:00:00 2001
From: Danny van Bruggen <hexagonaal@gmail.com>
Date: Fri, 8 Sep 2017 21:06:05 +0200
Subject: Add some method reference tests from the JLS

---
 .../javaparser/ast/expr/MethodReferenceTest.java   | 99 ++++++++++++++++++++++
 .../com/github/javaparser/utils/TestUtils.java     | 12 ++-
 2 files changed, 109 insertions(+), 2 deletions(-)

(limited to 'javaparser-testing')

diff --git a/javaparser-testing/src/test/java/com/github/javaparser/ast/expr/MethodReferenceTest.java b/javaparser-testing/src/test/java/com/github/javaparser/ast/expr/MethodReferenceTest.java
index 431e8c96e..ff1ae93e3 100644
--- a/javaparser-testing/src/test/java/com/github/javaparser/ast/expr/MethodReferenceTest.java
+++ b/javaparser-testing/src/test/java/com/github/javaparser/ast/expr/MethodReferenceTest.java
@@ -2,6 +2,11 @@ package com.github.javaparser.ast.expr;
 
 import org.junit.Test;
 
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import static com.github.javaparser.utils.TestUtils.assertExpressionValid;
 import static org.junit.Assert.assertTrue;
 
 public class MethodReferenceTest {
@@ -11,4 +16,98 @@ public class MethodReferenceTest {
         assertTrue(new MethodReferenceExpr().getScope() != null);
     }
 
+    @Test
+    public void reference1() {
+        assertExpressionValid("String::length");
+    }
+        
+    @Test
+    public void reference2() {
+        assertExpressionValid("System::currentTimeMillis // static method");
+    }
+        
+    @Test
+    public void reference3() {
+        assertExpressionValid("List<String>::size // explicit type arguments for generic type");
+    }
+        
+    @Test
+    public void reference4() {
+        assertExpressionValid("List::size // inferred type arguments for generic type");
+    }
+        
+    @Test
+    public void reference5() {
+        assertExpressionValid("int[]::clone");
+    }
+        
+    @Test
+    public void reference6() {
+        assertExpressionValid("T::tvarMember");
+    }
+        
+    @Test
+    public void reference7() {
+        assertExpressionValid("System.out::println");
+    }
+        
+    @Test
+    public void reference8() {
+        assertExpressionValid("\"abc\"::length");
+    }
+        
+    @Test
+    public void reference9() {
+        assertExpressionValid("foo[x]::bar");
+    }
+        
+    @Test
+    public void reference10() {
+        assertExpressionValid("(test ? list.replaceAll(String::trim) : list) :: iterator");
+    }
+        
+    @Test
+    public void reference11() {
+        assertExpressionValid("String::valueOf // overload resolution needed");
+    }
+        
+    @Test
+    public void reference12() {
+        assertExpressionValid("Arrays::sort // type arguments inferred from context");
+    }
+        
+    @Test
+    public void reference13() {
+        assertExpressionValid("Arrays::<String>sort // explicit type arguments");
+    }
+        
+    @Test
+    public void reference14() {
+        assertExpressionValid("ArrayList<String>::new // constructor for parameterized type");
+    }
+        
+    @Test
+    public void reference15() {
+        assertExpressionValid("ArrayList::new // inferred type arguments");
+    }
+        
+    @Test
+    public void reference16() {
+        assertExpressionValid("Foo::<Integer>new // explicit type arguments");
+    }
+        
+    @Test
+    public void reference17() {
+        assertExpressionValid("Bar<String>::<Integer>new // generic class, generic constructor");
+    }
+        
+    @Test
+    public void reference18() {
+        assertExpressionValid("Outer.Inner::new // inner class constructor");
+    }
+        
+    @Test
+    public void reference19() {
+        assertExpressionValid("int[]::new // array creation");
+    }
 }
diff --git a/javaparser-testing/src/test/java/com/github/javaparser/utils/TestUtils.java b/javaparser-testing/src/test/java/com/github/javaparser/utils/TestUtils.java
index 1a4b1d3a3..835eb146c 100644
--- a/javaparser-testing/src/test/java/com/github/javaparser/utils/TestUtils.java
+++ b/javaparser-testing/src/test/java/com/github/javaparser/utils/TestUtils.java
@@ -1,7 +1,8 @@
 package com.github.javaparser.utils;
 
-import com.github.javaparser.ParseResult;
-import com.github.javaparser.Problem;
+import com.github.javaparser.*;
+import com.github.javaparser.ast.expr.Expression;
+import com.github.javaparser.ast.validator.Java9Validator;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.Response;
@@ -18,6 +19,7 @@ import java.util.stream.Collectors;
 import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 
+import static com.github.javaparser.Providers.provider;
 import static com.github.javaparser.utils.Utils.EOL;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
@@ -133,4 +135,10 @@ public class TestUtils {
     public static void assertNoProblems(ParseResult<?> result) {
         assertProblems(result);
     }
+
+    public static void assertExpressionValid(String expression) {
+        JavaParser javaParser = new JavaParser(new ParserConfiguration().setValidator(new Java9Validator()));
+        ParseResult<Expression> result = javaParser.parse(ParseStart.EXPRESSION, provider(expression));
+        assertTrue(result.getProblems().toString(), result.isSuccessful());
+    }
 }
-- 
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