Create and test source mapping for invocations.

pkg/js_ast/test/printer_callback_test.dart

Index: pkg/js_ast/test/printer_callback_test.dart
diff --git a/pkg/js_ast/test/printer_callback_test.dart b/pkg/js_ast/test/printer_callback_test.dart
index 1a1db3590dbcd8c18020bd1bb79ceab277d90b32..e5256a304105346468933ba820c602e5cfacc4d7 100644
--- a/pkg/js_ast/test/printer_callback_test.dart
+++ b/pkg/js_ast/test/printer_callback_test.dart
@@ -10,6 +10,7 @@ import 'package:js_ast/js_ast.dart';
 import 'package:unittest/unittest.dart';
 
 enum TestMode {
+  INPUT,
   NONE,
   ENTER,
   DELIMITER,
@@ -42,7 +43,7 @@ function() {
   if (true) {
     foo1();
     foo2();
-  } else {
+  } else if (false) {
     bar1();
     bar2();
   }
@@ -56,13 +57,13 @@ function() {
   @2if (@3true) @4{
     @5@6@7foo1();
     @8@9@10foo2();
-  } else @11{
-    @12@13@14bar1();
-    @15@16@17bar2();
+  } else @11if (@12false) @13{
+    @14@15@16bar1();
+    @17@18@19bar2();
   }
-  @18while (@19false) @20{
-    @21@22@23baz3();
-    @24@25@26baz4();
+  @20while (@21false) @22{
+    @23@24@25baz3();
+    @26@27@28baz4();
   }
 }""",
     TestMode.DELIMITER: """
@@ -70,7 +71,7 @@ function() {
   if (true) {
     foo1();
     foo2();
-  } else {
+  } else if (false) {
     bar1();
     bar2();
   }
@@ -84,23 +85,79 @@ function() {
   if (true@3) {
     foo1@7()@6;
 @5    foo2@10()@9;
-@8  }@4 else {
-    bar1@14()@13;
-@12    bar2@17()@16;
-@15  }@11
-@2  while (false@19) {
-    baz3@23()@22;
-@21    baz4@26()@25;
-@24  }@20
-@18}@1@0""",
+@8  }@4 else if (false@12) {
+    bar1@16()@15;
+@14    bar2@19()@18;
+@17  }@13
+@11@2  while (false@21) {
+    baz3@25()@24;
+@23    baz4@28()@27;
+@26  }@22
+@20}@1@0""",
+  },
+
+  const {
+    TestMode.NONE: """
+function() {
+  function foo() {
+  }
+}""",
+    TestMode.ENTER: """
+@0function() @1{
+  @2@3function @4foo() @5{
+  }
+}""",
+    TestMode.DELIMITER: """
+function() {
+  function foo() {
+  @3}
+@0}""",
+   TestMode.EXIT: """
+function() {
+  function foo@4() {
+  }@5@3
+@2}@1@0"""
+  },
+
+  const {
+    TestMode.INPUT: """
+function() {
+  a['b'];
+  [1,, 2];
+}""",
+    TestMode.NONE: """
+function() {
+  a.b;
+  [1,, 2];
+}""",
+    TestMode.ENTER: """
+@0function() @1{
+  @2@3@4a.@5b;
+  @6@7[@81,@9, @102];
+}""",
+    TestMode.DELIMITER: """
+function() {
+  a.b;
+  [1,, 2];
+@0}""",
+   TestMode.EXIT: """
+function() {
+  a@4.b@5@3;
+@2  [1@8,,@9 2@10]@7;
+@6}@1@0""",
   },
 ];
 
 void check(Map<TestMode, String> map) {
-  String code = map[TestMode.NONE];
+  String code = map[TestMode.INPUT];
+  if (code == null) {
+    // Input is the same as output.
+    code = map[TestMode.NONE];
+  }
   JavaScriptPrintingOptions options = new JavaScriptPrintingOptions();
   Node node = js.parseForeignJS(code).instantiate({});
   map.forEach((TestMode mode, String expectedOutput) {
+    if (mode == TestMode.INPUT) return;
     Context context = new Context(mode);
     new Printer(options, context).visit(node);
     expect(context.getText(), equals(expectedOutput),