diff --git a/tests/corelib/from_environment_const_type_undefined_test.dart b/tests/corelib/from_environment_const_type_undefined_test.dart
index c555b027a27..c2e90ef6344 100644
--- a/tests/corelib/from_environment_const_type_undefined_test.dart
+++ b/tests/corelib/from_environment_const_type_undefined_test.dart
@@ -35,8 +35,8 @@ const
     d = const String.fromEnvironment('d');
 
 main() {
-  Expect.equals(a, false);
-  Expect.equals(b, false);
-  Expect.equals(c, null);
-  Expect.equals(d, null);
+  Expect.equals(false, a);
+  Expect.equals(false, b);
+  Expect.equals(0, c);
+  Expect.equals('', d);
 }
diff --git a/tests/corelib/int_from_environment2_test.dart b/tests/corelib/int_from_environment2_test.dart
index 348f0b04a68..102805647d8 100644
--- a/tests/corelib/int_from_environment2_test.dart
+++ b/tests/corelib/int_from_environment2_test.dart
@@ -6,9 +6,9 @@
 import "package:expect/expect.dart";
 
 main() {
-  Expect.isNull(const int.fromEnvironment('a'));
-  Expect.isNull(const int.fromEnvironment('b'));
-  Expect.isNull(const int.fromEnvironment('c'));
-  Expect.isNull(const int.fromEnvironment('d'));
-  Expect.isNull(const int.fromEnvironment('e'));
+  Expect.equals(0, const int.fromEnvironment('a'));
+  Expect.equals(0, const int.fromEnvironment('b'));
+  Expect.equals(0, const int.fromEnvironment('c'));
+  Expect.equals(0, const int.fromEnvironment('d'));
+  Expect.equals(0, const int.fromEnvironment('e'));
 }
diff --git a/tests/corelib_2/from_environment_const_type_undefined_test.dart b/tests/corelib_2/from_environment_const_type_undefined_test.dart
index c555b027a27..c2e90ef6344 100644
--- a/tests/corelib_2/from_environment_const_type_undefined_test.dart
+++ b/tests/corelib_2/from_environment_const_type_undefined_test.dart
@@ -35,8 +35,8 @@ const
     d = const String.fromEnvironment('d');
 
 main() {
-  Expect.equals(a, false);
-  Expect.equals(b, false);
-  Expect.equals(c, null);
-  Expect.equals(d, null);
+  Expect.equals(false, a);
+  Expect.equals(false, b);
+  Expect.equals(0, c);
+  Expect.equals('', d);
 }
diff --git a/tests/corelib_2/int_from_environment2_test.dart b/tests/corelib_2/int_from_environment2_test.dart
index 348f0b04a68..102805647d8 100644
--- a/tests/corelib_2/int_from_environment2_test.dart
+++ b/tests/corelib_2/int_from_environment2_test.dart
@@ -6,9 +6,9 @@
 import "package:expect/expect.dart";
 
 main() {
-  Expect.isNull(const int.fromEnvironment('a'));
-  Expect.isNull(const int.fromEnvironment('b'));
-  Expect.isNull(const int.fromEnvironment('c'));
-  Expect.isNull(const int.fromEnvironment('d'));
-  Expect.isNull(const int.fromEnvironment('e'));
+  Expect.equals(0, const int.fromEnvironment('a'));
+  Expect.equals(0, const int.fromEnvironment('b'));
+  Expect.equals(0, const int.fromEnvironment('c'));
+  Expect.equals(0, const int.fromEnvironment('d'));
+  Expect.equals(0, const int.fromEnvironment('e'));
 }
diff --git a/tests/language_2/string/const_interpolation2_test.dart b/tests/language_2/string/const_interpolation2_test.dart
index 4033d8e3e5a..968d2c2c740 100644
--- a/tests/language_2/string/const_interpolation2_test.dart
+++ b/tests/language_2/string/const_interpolation2_test.dart
@@ -88,7 +88,7 @@ main() {
   Expect.equals(b2.toString(), sb2);
   Expect.equals(b3.toString(), sb3);
   Expect.equals(b4.toString(), sb4);
-  var expect = "null null null null null null 42 3.1415 37 4.6692 2.71828 87 "
+  var expect = "null null null  0 null 42 3.1415 37 4.6692 2.71828 87 "
       "s1 s2 s1s2 s4 true false false true";
   Expect.equals(expect, interpolation1);
   Expect.equals(expect, interpolation2);
diff --git a/tests/lib_2/isolate/int_from_environment_default_value_test.dart b/tests/lib_2/isolate/int_from_environment_default_value_test.dart
index 852d6461de8..af7ccac13bf 100644
--- a/tests/lib_2/isolate/int_from_environment_default_value_test.dart
+++ b/tests/lib_2/isolate/int_from_environment_default_value_test.dart
@@ -11,7 +11,7 @@ import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
 
 void test(port) {
-  Expect.isNull(const int.fromEnvironment('NOT_FOUND'));
+  Expect.equals(0, const int.fromEnvironment('NOT_FOUND'));
   Expect.equals(
       12345, const int.fromEnvironment('NOT_FOUND', defaultValue: 12345));
   if (port != null) port.send(null);