Added __next__() and next() special methods to class-level completion (PY-11214)

python/psi-api/src/com/jetbrains/python/PyNames.java

@@ -347,6 +347,7 @@ public class PyNames {
     .putAll(BuiltinMethods)
     .put("__nonzero__", _only_self_descr)
     .put("__div__", _self_other_descr)
+    .put(NEXT, _only_self_descr)
     .build();
 
   public static ImmutableMap<String, BuiltinDescription> PY3_BUILTIN_METHODS = ImmutableMap.<String, BuiltinDescription>builder()
@@ -355,6 +356,7 @@ public class PyNames {
     .put("__bytes__", _only_self_descr)
     .put("__format__", new BuiltinDescription("(self, format_spec)"))
     .put("__round__", new BuiltinDescription("(self, n=None)"))
+    .put(DUNDER_NEXT, _only_self_descr)
     .build();
 
   public static ImmutableMap<String, BuiltinDescription> PY35_BUILTIN_METHODS = ImmutableMap.<String, BuiltinDescription>builder()

python/testData/completion/dunderNext.after.py

@@ -0,0 +1,2 @@
+class C:
+    def __next__(self):

python/testData/completion/dunderNext.py

@@ -0,0 +1,2 @@
+class C:
+    def __nex<caret>

python/testData/completion/next.after.py

@@ -0,0 +1,2 @@
+class C:
+    def next(self):

python/testData/completion/next.py

@@ -0,0 +1,2 @@
+class C:
+    def nex<caret>

python/testSrc/com/jetbrains/python/Py3CompletionTest.java

@@ -151,4 +151,9 @@ public class Py3CompletionTest extends PyTestCase {
       }
     });
   }
+
+  // PY-11214
+  public void testDunderNext() {
+    doTest();
+  }
 }

python/testSrc/com/jetbrains/python/PythonCompletionTest.java

@@ -770,4 +770,9 @@ public class PythonCompletionTest extends PyTestCase {
   public void testStructuralType() {
     doTest();
   }
+
+  // PY-11214
+  public void testNext() {
+    doTest();
+  }
 }