From d048679dbbaaf28108638777be205b48df7984dc Mon Sep 17 00:00:00 2001
From: Parker Lougheed <parlough@gmail.com>
Date: Tue, 10 Aug 2021 18:10:38 -0500
Subject: [PATCH] Analyze and test more cheatsheet snippets

---
 .../bin/cheatsheet/collection_literals.dart   | 27 ------
 examples/misc/bin/cheatsheet/exceptions.dart  | 53 ------------
 examples/misc/bin/null_aware_operators.dart   | 17 ----
 .../cheatsheet/getter_compute.dart            |  7 --
 .../cheatsheet/getters_setters.dart           |  6 --
 .../cheatsheet}/optional_named_params.dart    |  2 +-
 .../cheatsheet}/optional_positional_args.dart |  2 +-
 .../optional_positional_args2.dart            |  2 +-
 .../misc/test/cheatsheet/arguments_test.dart  | 44 ++++++++++
 .../cheatsheet/arrow_functions_test.dart}     | 14 +--
 .../test/cheatsheet/collections_test.dart     | 53 ++++++++++++
 .../misc/test/cheatsheet/exceptions_test.dart | 86 +++++++++++++++++++
 .../misc/test/cheatsheet/null_aware_test.dart | 48 +++++++++++
 .../misc/test/cheatsheet/properties_test.dart | 27 ++++++
 src/codelabs/dart-cheatsheet.md               | 46 +++++-----
 15 files changed, 293 insertions(+), 141 deletions(-)
 delete mode 100644 examples/misc/bin/cheatsheet/collection_literals.dart
 delete mode 100644 examples/misc/bin/cheatsheet/exceptions.dart
 delete mode 100644 examples/misc/bin/null_aware_operators.dart
 rename examples/misc/{bin => lib}/cheatsheet/getter_compute.dart (63%)
 rename examples/misc/{bin => lib}/cheatsheet/getters_setters.dart (66%)
 rename examples/misc/{bin => lib/cheatsheet}/optional_named_params.dart (92%)
 rename examples/misc/{bin => lib/cheatsheet}/optional_positional_args.dart (97%)
 rename examples/misc/{bin => lib/cheatsheet}/optional_positional_args2.dart (93%)
 create mode 100644 examples/misc/test/cheatsheet/arguments_test.dart
 rename examples/misc/{bin/cheatsheet/arrow_functions.dart => test/cheatsheet/arrow_functions_test.dart} (66%)
 create mode 100644 examples/misc/test/cheatsheet/collections_test.dart
 create mode 100644 examples/misc/test/cheatsheet/exceptions_test.dart
 create mode 100644 examples/misc/test/cheatsheet/null_aware_test.dart
 create mode 100644 examples/misc/test/cheatsheet/properties_test.dart

diff --git a/examples/misc/bin/cheatsheet/collection_literals.dart b/examples/misc/bin/cheatsheet/collection_literals.dart
deleted file mode 100644
index dec26f9005..0000000000
--- a/examples/misc/bin/cheatsheet/collection_literals.dart
+++ /dev/null
@@ -1,27 +0,0 @@
-// ignore_for_file: unused_local_variable
-
-void main() {
-  // #docregion collection-literals
-  final aListOfStrings = ['one', 'two', 'three'];
-  final aSetOfStrings = {'one', 'two', 'three'};
-  final aMapOfStringsToInts = {
-    'one': 1,
-    'two': 2,
-    'three': 3,
-  };
-  // #enddocregion collection-literals
-
-  // #docregion collection-literals-2
-  final aListOfInts = <int>[];
-  final aSetOfInts = <int>{};
-  final aMapOfIntToDouble = <int, double>{};
-  // #enddocregion collection-literals-2
-
-  // #docregion collection-literals-3
-  final aListOfBaseType = <BaseType>[SubType(), SubType()];
-  // #enddocregion collection-literals-3
-}
-
-class BaseType {}
-
-class SubType extends BaseType {}
diff --git a/examples/misc/bin/cheatsheet/exceptions.dart b/examples/misc/bin/cheatsheet/exceptions.dart
deleted file mode 100644
index 225e097fdf..0000000000
--- a/examples/misc/bin/cheatsheet/exceptions.dart
+++ /dev/null
@@ -1,53 +0,0 @@
-// ignore_for_file: dead_code, only_throw_errors
-
-void main() {
-  // #docregion try-on-catch
-  try {
-    breedMoreLlamas();
-  } on OutOfLlamasException {
-    // A specific exception
-    buyMoreLlamas();
-  } on Exception catch (e) {
-    // Anything else that is an exception
-    print('Unknown exception: $e');
-  } catch (e) {
-    // No specified type, handles all
-    print('Something really unknown: $e');
-  }
-  // #enddocregion try-on-catch
-
-  // #docregion try-catch
-  try {
-    breedMoreLlamas();
-  } catch (e) {
-    print('I was just trying to breed llamas!');
-    rethrow;
-  }
-  // #enddocregion try-catch
-
-  // #docregion try-catch-finally
-  try {
-    breedMoreLlamas();
-  } catch (e) {
-    // ... handle exception ...
-  } finally {
-    // Always clean up, even if an exception is thrown.
-    cleanLlamaStalls();
-  }
-  // #enddocregion try-catch-finally
-}
-
-void cleanLlamaStalls() {}
-
-void breedMoreLlamas() {}
-
-void buyMoreLlamas() {}
-
-class OutOfLlamasException implements Exception {}
-
-void throwErrors() {
-  // #docregion simple-throws
-  throw Exception('Something bad happened.');
-  throw 'Waaaaaaah!';
-  // #enddocregion simple-throws
-}
diff --git a/examples/misc/bin/null_aware_operators.dart b/examples/misc/bin/null_aware_operators.dart
deleted file mode 100644
index 9e58726b99..0000000000
--- a/examples/misc/bin/null_aware_operators.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// ignore_for_file: unnecessary_null_in_if_null_operators, dead_null_aware_expression
-
-void main() {
-// #docregion null-aware-operators
-  int? a; // = null
-  a ??= 3;
-  print(a); // <-- Prints 3.
-
-  a ??= 5;
-  print(a); // <-- Still prints 3.
-// #enddocregion null-aware-operators
-
-// #docregion null-aware-operators-2
-  print(1 ?? 3); // <-- Prints 1.
-  print(null ?? 12); // <-- Prints 12.
-// #enddocregion null-aware-operators-2
-}
diff --git a/examples/misc/bin/cheatsheet/getter_compute.dart b/examples/misc/lib/cheatsheet/getter_compute.dart
similarity index 63%
rename from examples/misc/bin/cheatsheet/getter_compute.dart
rename to examples/misc/lib/cheatsheet/getter_compute.dart
index f71e355e51..c350b55395 100644
--- a/examples/misc/bin/cheatsheet/getter_compute.dart
+++ b/examples/misc/lib/cheatsheet/getter_compute.dart
@@ -12,10 +12,3 @@ class MyClass {
   }
 }
 // #enddocregion
-
-void main() {
-  MyClass _class = MyClass();
-  _class.addValue(5);
-  _class.addValue(7);
-  print(_class.count.toString());
-}
diff --git a/examples/misc/bin/cheatsheet/getters_setters.dart b/examples/misc/lib/cheatsheet/getters_setters.dart
similarity index 66%
rename from examples/misc/bin/cheatsheet/getters_setters.dart
rename to examples/misc/lib/cheatsheet/getters_setters.dart
index 6f3cc73962..a5e952fef8 100644
--- a/examples/misc/bin/cheatsheet/getters_setters.dart
+++ b/examples/misc/lib/cheatsheet/getters_setters.dart
@@ -11,9 +11,3 @@ class MyClass {
   }
 }
 // #enddocregion
-
-void main() {
-  MyClass _class = MyClass();
-  _class.aProperty = 5;
-  print(_class.aProperty);
-}
diff --git a/examples/misc/bin/optional_named_params.dart b/examples/misc/lib/cheatsheet/optional_named_params.dart
similarity index 92%
rename from examples/misc/bin/optional_named_params.dart
rename to examples/misc/lib/cheatsheet/optional_named_params.dart
index 2d3131da9b..a9e68449d9 100644
--- a/examples/misc/bin/optional_named_params.dart
+++ b/examples/misc/lib/cheatsheet/optional_named_params.dart
@@ -4,7 +4,7 @@ void printName(String firstName, String lastName, {String? suffix}) {
 }
 // #enddocregion
 
-void main() {
+void printNameTest() {
   // #docregion
   printName('Avinash', 'Gupta');
   printName('Poshmeister', 'Moneybuckets', suffix: 'IV');
diff --git a/examples/misc/bin/optional_positional_args.dart b/examples/misc/lib/cheatsheet/optional_positional_args.dart
similarity index 97%
rename from examples/misc/bin/optional_positional_args.dart
rename to examples/misc/lib/cheatsheet/optional_positional_args.dart
index 705eb16769..6d6087188e 100644
--- a/examples/misc/bin/optional_positional_args.dart
+++ b/examples/misc/lib/cheatsheet/optional_positional_args.dart
@@ -15,7 +15,7 @@ int sumUp(int a, int b, int c) {
 }
 // #enddocregion optional-positional-args
 
-void main() {
+void mainTest() {
   // #docregion optional-positional-args
   int total = sumUp(1, 2, 3);
   // #enddocregion optional-positional-args
diff --git a/examples/misc/bin/optional_positional_args2.dart b/examples/misc/lib/cheatsheet/optional_positional_args2.dart
similarity index 93%
rename from examples/misc/bin/optional_positional_args2.dart
rename to examples/misc/lib/cheatsheet/optional_positional_args2.dart
index defed9e8a1..8ade9e9bb3 100644
--- a/examples/misc/bin/optional_positional_args2.dart
+++ b/examples/misc/lib/cheatsheet/optional_positional_args2.dart
@@ -6,7 +6,7 @@ int sumUpToFive(int a, [int b = 2, int c = 3, int d = 4, int e = 5]) {
 }
 // #enddocregion
 
-void main() {
+void mainTest() {
   // #docregion
   int newTotal = sumUpToFive(1);
   print(newTotal); // <-- prints 15
diff --git a/examples/misc/test/cheatsheet/arguments_test.dart b/examples/misc/test/cheatsheet/arguments_test.dart
new file mode 100644
index 0000000000..5e31340a31
--- /dev/null
+++ b/examples/misc/test/cheatsheet/arguments_test.dart
@@ -0,0 +1,44 @@
+import 'package:examples/cheatsheet/optional_named_params.dart';
+import 'package:examples/cheatsheet/optional_positional_args.dart' as optionalArgs;
+import 'package:examples/cheatsheet/optional_positional_args2.dart' as defaultedArgs;
+import 'package:test/test.dart';
+
+void main() {
+  test('print_name', () {
+    expect(() {
+      printNameTest();
+    }, prints('Avinash Gupta \nPoshmeister Moneybuckets IV\n'));
+  });
+
+  test('print_name_default', () {
+    // #docregion defaulted-suffix
+    void printName(String firstName, String lastName, {String suffix = ''}) {
+      print('$firstName $lastName $suffix');
+    }
+    // #enddocregion defaulted-suffix
+
+    expect(() {
+      printName('Dash', 'Dartisan', suffix: 'III');
+    }, prints('Dash Dartisan III\n'));
+
+    expect(() {
+      printName('Dash', 'Dartisan');
+    }, prints('Dash Dartisan \n'));
+  });
+
+  test('optional_positional_args', () {
+    expect(() {
+      optionalArgs.mainTest();
+    }, prints('6\n3\n15\n'));
+
+    expect(optionalArgs.sumUpToFive(1, 4, 7), equals(12));
+  });
+
+  test('optional_positional_args_defaulted', () {
+    expect(() {
+      defaultedArgs.mainTest();
+    }, prints('15\n'));
+    
+    expect(defaultedArgs.sumUpToFive(1, 1), equals(14));
+  });
+}
diff --git a/examples/misc/bin/cheatsheet/arrow_functions.dart b/examples/misc/test/cheatsheet/arrow_functions_test.dart
similarity index 66%
rename from examples/misc/bin/cheatsheet/arrow_functions.dart
rename to examples/misc/test/cheatsheet/arrow_functions_test.dart
index 49a86f85dc..5d5d089a7d 100644
--- a/examples/misc/bin/cheatsheet/arrow_functions.dart
+++ b/examples/misc/test/cheatsheet/arrow_functions_test.dart
@@ -1,19 +1,23 @@
-// ignore_for_file: unused_local_variable
+import 'package:test/test.dart';
 
 void main() {
   const aListOfStrings = ['a', 'b', 'c'];
 
-  {
+  test('has_empty_long', () {
     // #docregion has-empty-long
     bool hasEmpty = aListOfStrings.any((s) {
       return s.isEmpty;
     });
     // #enddocregion has-empty-long
-  }
 
-  {
+    expect(hasEmpty, isFalse);
+  });
+
+  test('has_empty_short', () {
     // #docregion has-empty-short
     bool hasEmpty = aListOfStrings.any((s) => s.isEmpty);
     // #enddocregion has-empty-short
-  }
+
+    expect(hasEmpty, isFalse);
+  });
 }
diff --git a/examples/misc/test/cheatsheet/collections_test.dart b/examples/misc/test/cheatsheet/collections_test.dart
new file mode 100644
index 0000000000..47df9b5530
--- /dev/null
+++ b/examples/misc/test/cheatsheet/collections_test.dart
@@ -0,0 +1,53 @@
+import 'package:test/test.dart';
+
+void main() {
+  test('collection_literals_inferred', () {
+    // #docregion collection-literals-inferred
+    final aListOfStrings = ['one', 'two', 'three'];
+    final aSetOfStrings = {'one', 'two', 'three'};
+    final aMapOfStringsToInts = {
+      'one': 1,
+      'two': 2,
+      'three': 3,
+    };
+    // #enddocregion collection-literals-inferred
+
+    expect(aListOfStrings, isA<List<String>>());
+    expect(aListOfStrings[1], equals('two'));
+
+    expect(aSetOfStrings, isA<Set<String>>());
+    expect(aSetOfStrings, contains('two'));
+
+    expect(aMapOfStringsToInts, isA<Map<String, int>>());
+    expect(aMapOfStringsToInts['two'], equals(2));
+  });
+
+  test('collection_literals_specified', () {
+    // #docregion collection-literals-specified
+    final aListOfInts = <int>[];
+    final aSetOfInts = <int>{};
+    final aMapOfIntToDouble = <int, double>{};
+    // #enddocregion collection-literals-specified
+
+    expect(aListOfInts, isA<List<int>>());
+
+    expect(aSetOfInts, isA<Set<int>>());
+
+    expect(aMapOfIntToDouble, isA<Map<int, double>>());
+  });
+
+  test('collection_literals_subtypes', () {
+    // #docregion collection-literals-subtypes
+    final aListOfBaseType = <BaseType>[SubType(), SubType()];
+    // #enddocregion collection-literals-subtypes
+
+    expect(aListOfBaseType, isA<List<BaseType>>());
+
+    expect(
+        aListOfBaseType, containsAllInOrder([isA<SubType>(), isA<SubType>()]));
+  });
+}
+
+class BaseType {}
+
+class SubType extends BaseType {}
diff --git a/examples/misc/test/cheatsheet/exceptions_test.dart b/examples/misc/test/cheatsheet/exceptions_test.dart
new file mode 100644
index 0000000000..03de3c5820
--- /dev/null
+++ b/examples/misc/test/cheatsheet/exceptions_test.dart
@@ -0,0 +1,86 @@
+// ignore_for_file: dead_code
+
+import 'package:test/test.dart';
+
+void main() {
+  test('try_on_catch', () {
+    expect(() {
+      // #docregion try-on-catch
+      try {
+        breedMoreLlamas();
+      } on OutOfLlamasException {
+        // A specific exception
+        buyMoreLlamas();
+      } on Exception catch (e) {
+        // Anything else that is an exception
+        print('Unknown exception: $e');
+      } catch (e) {
+        // No specified type, handles all
+        print('Something really unknown: $e');
+      }
+      // #enddocregion try-on-catch
+    }, prints('Bought more llamas.\n'));
+  });
+
+  test('simple_throws', () {
+    void throwErrors() {
+      // #docregion simple-throws
+      throw Exception('Something bad happened.');
+      throw 'Waaaaaaah!';
+      // #enddocregion simple-throws
+    }
+
+    expect(throwErrors, throwsException);
+  });
+
+  test('try_catch', () {
+    expect(() {
+      expect(() {
+        // #docregion try-catch
+        try {
+          breedMoreLlamas();
+        } catch (e) {
+          print('I was just trying to breed llamas!');
+          rethrow;
+        }
+        // #enddocregion try-catch
+      }, throwsA(isA<OutOfLlamasException>()));
+    }, prints('I was just trying to breed llamas!\n'));
+  });
+
+  test('try_catch_finally', () {
+    expect(() {
+      // #docregion try-catch-finally
+      try {
+        breedMoreLlamas();
+      } catch (e) {
+        // ... handle exception ...
+      } finally {
+        // Always clean up, even if an exception is thrown.
+        cleanLlamaStalls();
+      }
+      // #enddocregion try-catch-finally
+    }, prints('Cleaned llama stalls.\n'));
+  });
+}
+
+void cleanLlamaStalls() {
+  print('Cleaned llama stalls.');
+}
+
+void breedMoreLlamas() {
+  throw OutOfLlamasException();
+}
+
+void buyMoreLlamas() {
+  print('Bought more llamas.');
+}
+
+class OutOfLlamasException implements Exception {}
+
+void throwErrors() {
+  // #docregion simple-throws
+  throw Exception('Something bad happened.');
+  throw 'Waaaaaaah!';
+  // #enddocregion simple-throws
+}
diff --git a/examples/misc/test/cheatsheet/null_aware_test.dart b/examples/misc/test/cheatsheet/null_aware_test.dart
new file mode 100644
index 0000000000..003d88d296
--- /dev/null
+++ b/examples/misc/test/cheatsheet/null_aware_test.dart
@@ -0,0 +1,48 @@
+// ignore_for_file: unused_local_variable, unnecessary_null_in_if_null_operators, dead_null_aware_expression
+
+import 'package:test/test.dart';
+
+void main() {
+  test('null_aware_operators', () {
+    void nullAware() {
+      // #docregion null-aware-operators
+      int? a; // = null
+      a ??= 3;
+      print(a); // <-- Prints 3.
+
+      a ??= 5;
+      print(a); // <-- Still prints 3.
+      // #enddocregion null-aware-operators
+
+      // #docregion null-aware-operators-2
+      print(1 ?? 3); // <-- Prints 1.
+      print(null ?? 12); // <-- Prints 12.
+      // #enddocregion null-aware-operators-2
+    }
+
+    expect(nullAware, prints('3\n3\n1\n12\n'));
+  });
+
+  test('conditional_property_access', () {
+    dynamic myObject;
+    dynamic result;
+
+    // #docregion conditional-property-access
+    result = myObject?.someProperty;
+    // #enddocregion conditional-property-access
+
+    expect(result, isNull);
+
+    // #docregion conditional-property-access-equivalent
+    result = (myObject != null) ? myObject.someProperty : null;
+    // #enddocregion conditional-property-access-equivalent
+
+    expect(result, isNull);
+
+    // #docregion conditional-property-access-multiple
+    result = myObject?.someProperty?.someMethod();
+    // #enddocregion conditional-property-access-multiple
+
+    expect(result, isNull);
+  });
+}
diff --git a/examples/misc/test/cheatsheet/properties_test.dart b/examples/misc/test/cheatsheet/properties_test.dart
new file mode 100644
index 0000000000..17a7d89f08
--- /dev/null
+++ b/examples/misc/test/cheatsheet/properties_test.dart
@@ -0,0 +1,27 @@
+import 'package:examples/cheatsheet/getter_compute.dart' as getters_compute;
+import 'package:examples/cheatsheet/getters_setters.dart' as getters_setters;
+import 'package:test/test.dart';
+
+void main() {
+  test('getters_setters', () {
+    getters_setters.MyClass _class = getters_setters.MyClass();
+    _class.aProperty = 5;
+
+    expect(_class.aProperty, equals(5));
+
+    _class.aProperty = -10;
+
+    expect(_class.aProperty, equals(5));
+  });
+
+  test('getter_compute', () {
+    getters_compute.MyClass _class = getters_compute.MyClass();
+    _class.addValue(5);
+
+    expect(_class.count, equals(1));
+
+    _class.addValue(7);
+
+    expect(_class.count, equals(2));
+  });
+}
\ No newline at end of file
diff --git a/src/codelabs/dart-cheatsheet.md b/src/codelabs/dart-cheatsheet.md
index 15181ce154..7de8e4594e 100644
--- a/src/codelabs/dart-cheatsheet.md
+++ b/src/codelabs/dart-cheatsheet.md
@@ -168,11 +168,7 @@ Dart offers some handy operators for dealing with values that might be null. One
 `??=` assignment operator, which assigns a value to a variable only if that
 variable is currently null:
 
-{% comment %}
-TBD: Make this and all non-trivial snippets testable.
-{% endcomment %}
-
-<?code-excerpt "misc/bin/null_aware_operators.dart (null-aware-operators)"?>
+<?code-excerpt "misc/test/cheatsheet/null_aware_test.dart (null-aware-operators)"?>
 ```dart
 int? a; // = null
 a ??= 3;
@@ -187,7 +183,7 @@ which returns the expression on its left unless
 that expression's value is null,
 in which case it evaluates and returns the expression on its right:
 
-<?code-excerpt "misc/bin/null_aware_operators.dart (null-aware-operators-2)"?>
+<?code-excerpt "misc/test/cheatsheet/null_aware_test.dart (null-aware-operators-2)"?>
 ```dart
 print(1 ?? 3); // <-- Prints 1.
 print(null ?? 12); // <-- Prints 12.
@@ -263,18 +259,21 @@ and then give it a try.
 To guard access to a property or method of an object that might be null,
 put a question mark (`?`) before the dot (`.`):
 
+<?code-excerpt "misc/test/cheatsheet/null_aware_test.dart (conditional-property-access)" replace="/result = //g; /;//g;"?>
 ```dart
 myObject?.someProperty
 ```
 
 The preceding code is equivalent to the following:
 
+<?code-excerpt "misc/test/cheatsheet/null_aware_test.dart (conditional-property-access-equivalent)" replace="/result = //g; /;//g;"?>
 ```dart
 (myObject != null) ? myObject.someProperty : null
 ```
 
 You can chain multiple uses of `?.` together in a single expression:
 
+<?code-excerpt "misc/test/cheatsheet/null_aware_test.dart (conditional-property-multiple)" replace="/result = //g; /;//g;"?>
 ```dart
 myObject?.someProperty?.someMethod()
 ```
@@ -348,7 +347,7 @@ you could do it like this: str?.toLowerCase()
 Dart has built-in support for lists, maps, and sets.
 You can create them using literals:
 
-<?code-excerpt "misc/bin/cheatsheet/collection_literals.dart (collection-literals)"?>
+<?code-excerpt "misc/test/cheatsheet/collections_test.dart (collection-literals-inferred)"?>
 ```dart
 final aListOfStrings = ['one', 'two', 'three'];
 final aSetOfStrings = {'one', 'two', 'three'};
@@ -365,7 +364,7 @@ In this case, the inferred types are `List<String>`,
 
 Or you can specify the type yourself:
 
-<?code-excerpt "misc/bin/cheatsheet/collection_literals.dart (collection-literals-2)"?>
+<?code-excerpt "misc/test/cheatsheet/collections_test.dart (collection-literals-specified)"?>
 ```dart
 final aListOfInts = <int>[];
 final aSetOfInts = <int>{};
@@ -375,7 +374,7 @@ final aMapOfIntToDouble = <int, double>{};
 Specifying types is handy when you initialize a list with contents of a subtype,
 but still want the list to be `List<BaseType>`:
 
-<?code-excerpt "misc/bin/cheatsheet/collection_literals.dart (collection-literals-3)"?>
+<?code-excerpt "misc/test/cheatsheet/collections_test.dart (collection-literals-subtypes)"?>
 ```dart
 final aListOfBaseType = <BaseType>[SubType(), SubType()];
 ```
@@ -491,7 +490,7 @@ expression to its right and returns its value.
 For example, consider this call to the `List` class's
 `any()` method:
 
-<?code-excerpt "misc/bin/cheatsheet/arrow_functions.dart (has-empty-long)"?>
+<?code-excerpt "misc/test/cheatsheet/arrow_functions_test.dart (has-empty-long)"?>
 ```dart
 bool hasEmpty = aListOfStrings.any((s) {
   return s.isEmpty;
@@ -500,7 +499,7 @@ bool hasEmpty = aListOfStrings.any((s) {
 
 Here’s a simpler way to write that code:
 
-<?code-excerpt "misc/bin/cheatsheet/arrow_functions.dart (has-empty-short)"?>
+<?code-excerpt "misc/test/cheatsheet/arrow_functions_test.dart (has-empty-short)"?>
 ```dart
 bool hasEmpty = aListOfStrings.any((s) => s.isEmpty);
 ```
@@ -769,7 +768,7 @@ than a simple field allows.
 
 For example, you can make sure a property's value is valid:
 
-<?code-excerpt "misc/bin/cheatsheet/getters_setters.dart"?>
+<?code-excerpt "misc/lib/cheatsheet/getters_setters.dart"?>
 ```dart
 class MyClass {
   int _aProperty = 0;
@@ -786,7 +785,7 @@ class MyClass {
 
 You can also use a getter to define a computed property:
 
-<?code-excerpt "misc/bin/cheatsheet/getter_compute.dart"?>
+<?code-excerpt "misc/lib/cheatsheet/getter_compute.dart"?>
 ```dart
 class MyClass {
   final List<int> _values = [];
@@ -916,7 +915,7 @@ with a function you give it
 Dart has two kinds of function parameters: positional and named. Positional parameters are the kind
 you're likely familiar with:
 
-<?code-excerpt "misc/bin/optional_positional_args.dart (optional-positional-args)"?>
+<?code-excerpt "misc/lib/cheatsheet/optional_positional_args.dart (optional-positional-args)"?>
 ```dart
 int sumUp(int a, int b, int c) {
   return a + b + c;
@@ -927,7 +926,7 @@ int sumUp(int a, int b, int c) {
 
 With Dart, you can make these positional parameters optional by wrapping them in brackets:
 
-<?code-excerpt "misc/bin/optional_positional_args.dart (optional-positional-args-2)" replace="/total2/total/g"?>
+<?code-excerpt "misc/lib/cheatsheet/optional_positional_args.dart (optional-positional-args-2)" replace="/total2/total/g"?>
 ```dart
 int sumUpToFive(int a, [int? b, int? c, int? d, int? e]) {
   int sum = a;
@@ -946,7 +945,7 @@ Optional positional parameters are always last
 in a function's parameter list.
 Their default value is null unless you provide another default value:
 
-<?code-excerpt "misc/bin/optional_positional_args2.dart"?>
+<?code-excerpt "misc/lib/cheatsheet/optional_positional_args2.dart"?>
 ```dart
 int sumUpToFive(int a, [int b = 2, int c = 3, int d = 4, int e = 5]) {
 // ···
@@ -1052,7 +1051,7 @@ before you add them to the final string.
 Using a curly brace syntax,
 you can define optional parameters that have names.
 
-<?code-excerpt "misc/bin/optional_named_params.dart"?>
+<?code-excerpt "misc/lib/cheatsheet/optional_named_params.dart"?>
 ```dart
 void printName(String firstName, String lastName, {String? suffix}) {
   print('$firstName $lastName ${suffix ?? ''}');
@@ -1073,11 +1072,12 @@ or mark the parameter as `required`
 (as shown in the
 [constructor section](#using-this-in-a-constructor)).
 
-{% prettify dart tag=pre+code %}
+<?code-excerpt "misc/test/cheatsheet/arguments_test.dart" replace="/ = ''/[! = ''!]/g;"?>
+```dart
 void printName(String firstName, String lastName, {String suffix[! = ''!]}) {
   print('$firstName $lastName $suffix');
 }
-{% endprettify %}
+```
 
 A function can't have both optional positional and optional named parameters.
 
@@ -1206,7 +1206,7 @@ any exceptions.
 Dart provides `Exception` and `Error` types, but you're
 allowed to throw any non-null object:
 
-<?code-excerpt "misc/bin/cheatsheet/exceptions.dart (simple-throws)"?>
+<?code-excerpt "misc/test/cheatsheet/exceptions_test.dart (simple-throws)"?>
 ```dart
 throw Exception('Something bad happened.');
 throw 'Waaaaaaah!';
@@ -1214,7 +1214,7 @@ throw 'Waaaaaaah!';
 
 Use the `try`, `on`, and `catch` keywords when handling exceptions:
 
-<?code-excerpt "misc/bin/cheatsheet/exceptions.dart (try-on-catch)"?>
+<?code-excerpt "misc/test/cheatsheet/exceptions_test.dart (try-on-catch)"?>
 ```dart
 try {
   breedMoreLlamas();
@@ -1237,7 +1237,7 @@ and the `catch` keyword to get a reference to the exception object.
 If you can't completely handle the exception, use the `rethrow` keyword
 to propagate the exception:
 
-<?code-excerpt "misc/bin/cheatsheet/exceptions.dart (try-catch)"?>
+<?code-excerpt "misc/test/cheatsheet/exceptions_test.dart (try-catch)"?>
 ```dart
 try {
   breedMoreLlamas();
@@ -1250,7 +1250,7 @@ try {
 To execute code whether or not an exception is thrown,
 use `finally`:
 
-<?code-excerpt "misc/bin/cheatsheet/exceptions.dart (try-catch-finally)"?>
+<?code-excerpt "misc/test/cheatsheet/exceptions_test.dart (try-catch-finally)"?>
 ```dart
 try {
   breedMoreLlamas();