diff --git a/packages/flutter/lib/src/rendering/debug.dart b/packages/flutter/lib/src/rendering/debug.dart
index 195b735666..3efd8bceca 100644
--- a/packages/flutter/lib/src/rendering/debug.dart
+++ b/packages/flutter/lib/src/rendering/debug.dart
@@ -7,40 +7,55 @@ import 'package:flutter/rendering.dart';
 
 export 'package:flutter/foundation.dart' show debugPrint;
 
+// Any changes to this file should be reflected in the debugAssertAllRenderVarsUnset()
+// function below.
+
+const Color _kDebugPaintSizeColor = const Color(0xFF00FFFF);
+const Color _kDebugPaintSpacingColor = const Color(0x90909090);
+const Color _kDebugPaintPaddingColor = const Color(0x900090FF);
+const Color _kDebugPaintPaddingInnerEdgeColor = const Color(0xFF0090FF);
+const Color _kDebugPaintArrowColor = const Color(0xFFFFFF00);
+const Color _kDebugPaintAlphabeticBaselineColor = const Color(0xFF00FF00);
+const Color _kDebugPaintIdeographicBaselineColor = const Color(0xFFFFD000);
+const Color _kDebugPaintLayerBordersColor = const Color(0xFFFF9800);
+const int _kDebugPaintPointersColorValue = 0x00BBBB;
+const HSVColor _kDebugCurrentRepaintColor = const HSVColor.fromAHSV(0.4, 60.0, 1.0, 1.0);
+const double _kDebugRepaintRainbowHueIncrement = 2.0;
+
 /// Causes each RenderBox to paint a box around its bounds, and some extra
 /// boxes, such as RenderPadding, to draw construction lines.
 bool debugPaintSizeEnabled = false;
 
 /// The color to use when painting RenderObject bounds.
-Color debugPaintSizeColor = const Color(0xFF00FFFF);
+Color debugPaintSizeColor = _kDebugPaintSizeColor;
 
 /// The color to use when painting some boxes that just add space (e.g. an empty
 /// RenderConstrainedBox or RenderPadding).
-Color debugPaintSpacingColor = const Color(0x90909090);
+Color debugPaintSpacingColor = _kDebugPaintSpacingColor;
 
 /// The color to use when painting RenderPadding edges.
-Color debugPaintPaddingColor = const Color(0x900090FF);
+Color debugPaintPaddingColor = _kDebugPaintPaddingColor;
 
 /// The color to use when painting RenderPadding edges.
-Color debugPaintPaddingInnerEdgeColor = const Color(0xFF0090FF);
+Color debugPaintPaddingInnerEdgeColor = _kDebugPaintPaddingInnerEdgeColor;
 
 /// The color to use when painting the arrows used to show RenderPositionedBox alignment.
-Color debugPaintArrowColor = const Color(0xFFFFFF00);
+Color debugPaintArrowColor = _kDebugPaintArrowColor;
 
 /// Causes each RenderBox to paint a line at each of its baselines.
 bool debugPaintBaselinesEnabled = false;
 
 /// The color to use when painting alphabetic baselines.
-Color debugPaintAlphabeticBaselineColor = const Color(0xFF00FF00);
+Color debugPaintAlphabeticBaselineColor = _kDebugPaintAlphabeticBaselineColor;
 
 /// The color ot use when painting ideographic baselines.
-Color debugPaintIdeographicBaselineColor = const Color(0xFFFFD000);
+Color debugPaintIdeographicBaselineColor = _kDebugPaintIdeographicBaselineColor;
 
 /// Causes each Layer to paint a box around its bounds.
 bool debugPaintLayerBordersEnabled = false;
 
 /// The color to use when painting Layer borders.
-Color debugPaintLayerBordersColor = const Color(0xFFFF9800);
+Color debugPaintLayerBordersColor = _kDebugPaintLayerBordersColor;
 
 /// Causes objects like [RenderPointerListener] to flash while they are being
 /// tapped. This can be useful to see how large the hit box is, e.g. when
@@ -51,16 +66,16 @@ Color debugPaintLayerBordersColor = const Color(0xFFFF9800);
 bool debugPaintPointersEnabled = false;
 
 /// The color to use when reporting pointers for [debugPaintPointersEnabled].
-int debugPaintPointersColorValue = 0x00BBBB;
+int debugPaintPointersColorValue = _kDebugPaintPointersColorValue;
 
 /// Overlay a rotating set of colors when repainting layers in checked mode.
 bool debugRepaintRainbowEnabled = false;
 
 /// The current color to overlay when repainting a layer.
-HSVColor debugCurrentRepaintColor = const HSVColor.fromAHSV(0.4, 60.0, 1.0, 1.0);
+HSVColor debugCurrentRepaintColor = _kDebugCurrentRepaintColor;
 
 /// The amount to increment the hue of the current repaint color.
-double debugRepaintRainbowHueIncrement = 2.0;
+double debugRepaintRainbowHueIncrement = _kDebugRepaintRainbowHueIncrement;
 
 /// Log the call stacks that mark render objects as needing paint.
 bool debugPrintMarkNeedsPaintStacks = false;
@@ -89,3 +104,39 @@ List<String> debugDescribeTransform(Matrix4 transform) {
   matrix.removeLast();
   return matrix;
 }
+
+/// Returns true if none of the rendering library debug variables have been changed.
+///
+/// This function is used by the test framework to ensure that debug variables
+/// haven't been inadvertently changed.
+///
+/// See [https://docs.flutter.io/flutter/rendering/rendering-library.html] for
+/// a complete list.
+bool debugAssertAllRenderVarsUnset(String reason) {
+  assert(() {
+    if (debugPaintSizeEnabled ||
+        debugPaintBaselinesEnabled ||
+        debugPaintLayerBordersEnabled ||
+        debugPaintPointersEnabled ||
+        debugRepaintRainbowEnabled ||
+        debugPrintMarkNeedsPaintStacks ||
+        debugPrintMarkNeedsLayoutStacks ||
+        debugCheckIntrinsicSizes ||
+        debugProfilePaintsEnabled ||
+        debugPaintSizeColor != _kDebugPaintSizeColor ||
+        debugPaintSpacingColor != _kDebugPaintSpacingColor ||
+        debugPaintPaddingColor != _kDebugPaintPaddingColor ||
+        debugPaintPaddingInnerEdgeColor != _kDebugPaintPaddingInnerEdgeColor ||
+        debugPaintArrowColor != _kDebugPaintArrowColor ||
+        debugPaintAlphabeticBaselineColor != _kDebugPaintAlphabeticBaselineColor ||
+        debugPaintIdeographicBaselineColor != _kDebugPaintIdeographicBaselineColor ||
+        debugPaintLayerBordersColor != _kDebugPaintLayerBordersColor ||
+        debugPaintPointersColorValue != _kDebugPaintPointersColorValue ||
+        debugCurrentRepaintColor != _kDebugCurrentRepaintColor ||
+        debugRepaintRainbowHueIncrement != _kDebugRepaintRainbowHueIncrement) {
+      throw new FlutterError(reason);
+    }
+    return true;
+  });
+  return true;
+}
diff --git a/packages/flutter/lib/src/scheduler/debug.dart b/packages/flutter/lib/src/scheduler/debug.dart
index 6b374c4666..18b3fb49f8 100644
--- a/packages/flutter/lib/src/scheduler/debug.dart
+++ b/packages/flutter/lib/src/scheduler/debug.dart
@@ -2,6 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'package:flutter/foundation.dart';
+
+// Any changes to this file should be reflected in the debugAssertAllSchedulerVarsUnset()
+// function below.
+
 /// Print a banner at the beginning of each frame.
 ///
 /// Frames triggered by the engine and handler by the scheduler binding will
@@ -24,3 +29,21 @@ bool debugPrintBeginFrameBanner = false;
 /// Combined with [debugPrintBeginFrameBanner], this can be helpful for
 /// determining if code is running during a frame or between frames.
 bool debugPrintEndFrameBanner = false;
+
+/// Returns true if none of the scheduler library debug variables have been changed.
+///
+/// This function is used by the test framework to ensure that debug variables
+/// haven't been inadvertently changed.
+///
+/// See [https://docs.flutter.io/flutter/scheduler/scheduler-library.html] for
+/// a complete list.
+bool debugAssertAllSchedulerVarsUnset(String reason) {
+  assert(() {
+    if (debugPrintBeginFrameBanner ||
+        debugPrintEndFrameBanner) {
+      throw new FlutterError(reason);
+    }
+    return true;
+  });
+  return true;
+}
diff --git a/packages/flutter/lib/src/widgets/debug.dart b/packages/flutter/lib/src/widgets/debug.dart
index 6717547029..02841dea62 100644
--- a/packages/flutter/lib/src/widgets/debug.dart
+++ b/packages/flutter/lib/src/widgets/debug.dart
@@ -8,6 +8,9 @@ import 'package:flutter/foundation.dart';
 import 'framework.dart';
 import 'table.dart';
 
+// Any changes to this file should be reflected in the debugAssertAllWidgetVarsUnset()
+// function below.
+
 /// Log the dirty widgets that are built each frame.
 ///
 /// Combined with [debugPrintBuildScope] or [debugPrintBeginFrameBanner], this
@@ -167,3 +170,24 @@ void debugWidgetBuilderValue(Widget widget, Widget built) {
     return true;
   });
 }
+
+/// Returns true if none of the widget library debug variables have been changed.
+///
+/// This function is used by the test framework to ensure that debug variables
+/// haven't been inadvertently changed.
+///
+/// See [https://docs.flutter.io/flutter/widgets/widgets-library.html] for
+/// a complete list.
+bool debugAssertAllWidgetVarsUnset(String reason) {
+  assert(() {
+    if (debugPrintRebuildDirtyWidgets ||
+        debugPrintBuildScope ||
+        debugPrintScheduleBuildForStacks ||
+        debugPrintGlobalKeyedWidgetLifecycle ||
+        debugProfileBuildsEnabled) {
+      throw new FlutterError(reason);
+    }
+    return true;
+  });
+  return true;
+}
diff --git a/packages/flutter_test/lib/src/binding.dart b/packages/flutter_test/lib/src/binding.dart
index 5aef98f351..5e3483c21e 100644
--- a/packages/flutter_test/lib/src/binding.dart
+++ b/packages/flutter_test/lib/src/binding.dart
@@ -395,6 +395,15 @@ abstract class TestWidgetsFlutterBinding extends BindingBase
     assert(debugAssertNoTransientCallbacks(
       'An animation is still running even after the widget tree was disposed.'
     ));
+    assert(debugAssertAllRenderVarsUnset(
+      'The value of a rendering debug variable was changed by the test.'
+    ));
+    assert(debugAssertAllWidgetVarsUnset(
+      'The value of a widget debug variable was changed by the test.'
+    ));
+    assert(debugAssertAllSchedulerVarsUnset(
+      'The value of a scheduler debug variable was changed by the test.'
+    ));
   }
 
   /// Called by the [testWidgets] function after a test is executed.