Remove all use of `gn desc` global test fixtures. (#55592)

Closes https://github.com/flutter/flutter/issues/148420.
diff --git a/tools/engine_tool/lib/src/gn.dart b/tools/engine_tool/lib/src/gn.dart
index d203ee6..fe73076 100644
--- a/tools/engine_tool/lib/src/gn.dart
+++ b/tools/engine_tool/lib/src/gn.dart
@@ -1,6 +1,5 @@
 import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
-import 'package:process_runner/process_runner.dart';
 
 import 'environment.dart';
 import 'label.dart';
@@ -19,13 +18,15 @@
 
   final Environment _environment;
 
-  String get _gnPath => p.join(
-        _environment.engine.srcDir.path,
-        'flutter',
-        'third_party',
-        'gn',
-        _environment.platform.isWindows ? 'gn.exe' : 'gn',
-      );
+  String get _gnPath {
+    return p.join(
+      _environment.engine.srcDir.path,
+      'flutter',
+      'third_party',
+      'gn',
+      _environment.platform.isWindows ? 'gn.exe' : 'gn',
+    );
+  }
 
   /// Returns a list of build targets that match the given [pattern].
   ///
@@ -41,15 +42,14 @@
     String outDir,
     TargetPattern pattern,
   ) async {
-    final List<String> command = <String>[
+    final command = [
       _gnPath,
       'desc',
       '--format=json',
       outDir,
       pattern.toGnPattern(),
     ];
-    final ProcessRunnerResult process =
-        await _environment.processRunner.runProcess(
+    final process = await _environment.processRunner.runProcess(
       command,
       workingDirectory: _environment.engine.srcDir,
       failOk: true,
@@ -72,7 +72,7 @@
             'No targets matched the pattern `${pattern.toGnPattern()}`',
           );
         }
-        return <BuildTarget>[];
+        return [];
       }
 
       _environment.logger.fatal(
@@ -95,13 +95,13 @@
     return result
         .asMap()
         .entries
-        .map((MapEntry<String, Object?> entry) {
-          final String label = entry.key;
-          final Object? properties = entry.value;
+        .map((entry) {
+          final label = entry.key;
+          final properties = entry.value;
           if (properties is! Map<String, Object?>) {
             return null;
           }
-          final BuildTarget? target = BuildTarget._fromJson(
+          final target = BuildTarget._fromJson(
             label,
             JsonObject(properties),
           );
@@ -130,7 +130,7 @@
     final (
       String type,
       bool testOnly,
-    ) = json.map((JsonObject json) => (
+    ) = json.map((json) => (
           json.string('type'),
           json.boolean('testonly'),
         ));
diff --git a/tools/engine_tool/test/build_command_test.dart b/tools/engine_tool/test/build_command_test.dart
index acf8ea7..7709f49 100644
--- a/tools/engine_tool/test/build_command_test.dart
+++ b/tools/engine_tool/test/build_command_test.dart
@@ -17,17 +17,9 @@
 import 'utils.dart';
 
 void main() {
-  final cannedProcesses = [
-    CannedProcess(
-      (command) => command.contains('desc'),
-      stdout: fixtures.gnDescOutput(),
-    ),
-  ];
-
   test('can find host runnable build', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -61,7 +53,6 @@
   test('build command invokes gn', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -96,7 +87,6 @@
   test('build command invokes ninja', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -130,7 +120,6 @@
   test('build command invokes generator', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -167,7 +156,6 @@
   test('build command does not invoke tests', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -205,7 +193,6 @@
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
       withRbe: true,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -254,7 +241,6 @@
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
       withRbe: true,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -298,7 +284,6 @@
   test('build command fails when rbe is enabled but not supported', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
       // Intentionally omit withRbe: true.
       // That means the //flutter/build/rbe directory will not be created.
     );
@@ -335,7 +320,6 @@
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
       withRbe: true,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -383,7 +367,6 @@
       () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
@@ -423,9 +406,7 @@
   });
 
   test('mangleConfigName removes the OS and adds ci/ as needed', () {
-    final testEnv = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
-    );
+    final testEnv = TestEnvironment.withTestEngine();
     addTearDown(testEnv.cleanup);
 
     final env = testEnv.environment;
@@ -434,9 +415,7 @@
   });
 
   test('mangleConfigName throws when the input config name is malformed', () {
-    final testEnv = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
-    );
+    final testEnv = TestEnvironment.withTestEngine();
     addTearDown(testEnv.cleanup);
 
     final env = testEnv.environment;
@@ -447,9 +426,7 @@
   });
 
   test('demangleConfigName adds the OS and removes ci/ as needed', () {
-    final testEnv = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
-    );
+    final testEnv = TestEnvironment.withTestEngine();
     addTearDown(testEnv.cleanup);
 
     final env = testEnv.environment;
@@ -467,9 +444,7 @@
     final configs = <String, BuilderConfig>{
       'namespace_test_config': namespaceTestConfigs,
     };
-    final testEnv = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
-    );
+    final testEnv = TestEnvironment.withTestEngine();
     addTearDown(testEnv.cleanup);
 
     final runner = ToolCommandRunner(
@@ -496,9 +471,7 @@
     final configs = <String, BuilderConfig>{
       'namespace_test_config': namespaceTestConfigs,
     };
-    final testEnv = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
-    );
+    final testEnv = TestEnvironment.withTestEngine();
     addTearDown(testEnv.cleanup);
 
     final runner = ToolCommandRunner(
@@ -519,7 +492,20 @@
   test('build command invokes ninja with the specified target', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
+      cannedProcesses: [
+        CannedProcess(
+          (command) => command.contains('desc'),
+          stdout: convert.jsonEncode({
+            '//flutter/fml:fml_arc_unittests': {
+              'outputs': [
+                '//out/host_debug/fml_arc_unittests',
+              ],
+              'testonly': true,
+              'type': 'executable',
+            },
+          }),
+        ),
+      ],
     );
     addTearDown(testEnv.cleanup);
 
@@ -571,7 +557,34 @@
   test('build command invokes ninja with all matched targets', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
+      cannedProcesses: [
+        CannedProcess(
+          (command) => command.contains('desc'),
+          stdout: convert.jsonEncode({
+            '//flutter/display_list:display_list_unittests': {
+              'outputs': [
+                '//out/host_debug/display_list_unittests',
+              ],
+              'testonly': true,
+              'type': 'executable',
+            },
+            '//flutter/flow:flow_unittests': {
+              'outputs': [
+                '//out/host_debug/flow_unittests',
+              ],
+              'testonly': true,
+              'type': 'executable',
+            },
+            '//flutter/fml:fml_arc_unittests': {
+              'outputs': [
+                '//out/host_debug/fml_arc_unittests',
+              ],
+              'testonly': true,
+              'type': 'executable',
+            },
+          }),
+        ),
+      ],
     );
     addTearDown(testEnv.cleanup);
 
@@ -623,18 +636,17 @@
   });
 
   test('build command gracefully handles no matched targets', () async {
-    final cannedProcesses = [
-      CannedProcess(
-        (command) => command.contains('desc'),
-        stdout: fixtures.gnDescOutputEmpty(
-          gnPattern: 'testing/scenario_app:sceario_app',
-        ),
-        exitCode: 1,
-      ),
-    ];
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
+      cannedProcesses: [
+        CannedProcess(
+          (command) => command.contains('desc'),
+          stdout: '''
+The input testing/scenario_app:sceario_app matches no targets, configs or files.
+''',
+          exitCode: 1,
+        ),
+      ],
     );
     addTearDown(testEnv.cleanup);
 
@@ -671,7 +683,6 @@
 
   test('et help build line length is not too big', () async {
     final testEnv = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
       verbose: true,
     );
     addTearDown(testEnv.cleanup);
@@ -699,7 +710,6 @@
   test('verbose "et help build" contains CI builds', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
       verbose: true,
     );
     addTearDown(testEnv.cleanup);
@@ -740,7 +750,6 @@
   test('non-verbose "et help build" does not contain ci builds', () async {
     final testEnv = TestEnvironment.withTestEngine(
       abi: Abi.macosArm64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnv.cleanup);
 
diff --git a/tools/engine_tool/test/fixtures.dart b/tools/engine_tool/test/fixtures.dart
index 6b11910..42d7f24 100644
--- a/tools/engine_tool/test/fixtures.dart
+++ b/tools/engine_tool/test/fixtures.dart
@@ -226,102 +226,3 @@
   }
 ]
 ''';
-
-String gnDescOutput() => '''
-{
-   "//flutter/display_list:display_list_unittests": {
-      "all_dependent_configs": [ "//flutter/skia:fontmgr_mac_ct_public", "//flutter/skia:gpu_public", "//flutter/skia:gpu_shared_public", "//flutter/skia:jpeg_encode_public", "//flutter/skia:png_encode_public", "//flutter/skia:webp_encode_public", "//flutter/skia:jpeg_decode_public", "//flutter/skia:png_decode_public", "//flutter/skia:webp_decode_public", "//flutter/skia:wuffs_public", "//flutter/skia:xml_public" ],
-      "allow_circular_includes_from": [  ],
-      "asmflags": [ "-fno-strict-aliasing", "-fstack-protector-all", "--target=x86_64-apple-macos", "-arch", "x86_64", "-fcolor-diagnostics" ],
-      "cflags": [ "-fno-strict-aliasing", "-fstack-protector-all", "--target=x86_64-apple-macos", "-arch", "x86_64", "-fcolor-diagnostics", "-Wall", "-Wextra", "-Wendif-labels", "-Werror", "-Wno-missing-field-initializers", "-Wno-unused-parameter", "-Wno-unused-but-set-parameter", "-Wno-unused-but-set-variable", "-Wno-implicit-int-float-conversion", "-Wno-deprecated-copy", "-Wno-psabi", "-Wno-deprecated-literal-operator", "-Wno-unqualified-std-cast-call", "-Wno-non-c-typedef-for-linkage", "-Wno-range-loop-construct", "-Wunguarded-availability", "-Wno-deprecated-declarations", "-fvisibility=hidden", "-Wstring-conversion", "-Wnewline-eof", "-O2", "-fno-ident", "-fdata-sections", "-ffunction-sections", "-g2", "-Wunreachable-code", "-Wno-newline-eof" ],
-      "cflags_c": [ "-std=c99" ],
-      "cflags_cc": [ "-fvisibility-inlines-hidden", "-std=c++17", "-fno-rtti", "-nostdinc++", "-nostdinc++", "-fvisibility=hidden", "-fno-exceptions", "-stdlib=libc++", "-Wno-inconsistent-missing-override" ],
-      "cflags_objcc": [ "-fvisibility-inlines-hidden", "-fobjc-call-cxx-cdtors", "-std=c++17", "-fno-rtti", "-nostdinc++", "-nostdinc++", "-fvisibility=hidden", "-fno-exceptions", "-Wno-unguarded-availability" ],
-      "check_includes": true,
-      "configs": [ "//build/config:feature_flags", "//build/config/compiler:compiler", "//build/config/compiler:cxx_version_default", "//build/config/compiler:compiler_arm_fpu", "//build/config/compiler:chromium_code", "//build/config/compiler:default_include_dirs", "//build/config/compiler:no_rtti", "//build/config/compiler:runtime_library", "//third_party/libcxxabi:libcxxabi_config", "//third_party/libcxx:libcxx_config", "//build/config/gcc:no_exceptions", "//build/config/gcc:symbol_visibility_hidden", "//build/config:symbol_visibility_hidden", "//build/config/mac:sdk", "//build/config/clang:extra_warnings", "//build/config/clang:find_bad_constructs", "//build/config:release", "//build/config/compiler:optimize", "//build/config/compiler:default_optimization", "//build/config/compiler:symbols", "//build/config:default_libs", "//build/config/mac:mac_dynamic_flags", "//build/config/mac:mac_executable_flags", "//flutter/skia:fontmgr_mac_ct_public", "//flutter/skia:gpu_public", "//flutter/skia:gpu_shared_public", "//flutter/skia:jpeg_encode_public", "//flutter/skia:png_encode_public", "//flutter/skia:webp_encode_public", "//flutter/skia:jpeg_decode_public", "//flutter/skia:png_decode_public", "//flutter/skia:webp_decode_public", "//flutter/skia:wuffs_public", "//flutter/skia:xml_public", "//flutter/display_list:display_list_config", "//flutter:config", "//flutter/common:flutter_config", "//flutter/impeller:impeller_public_config", "//flutter/impeller/runtime_stage:runtime_stage_config", "//flutter/third_party/flatbuffers:flatbuffers_public_configs", "//flutter/impeller/renderer:embed_embed_mtl_compute_shaders", "//flutter/impeller/renderer:reflect_reflect_mtl_compute_shaders", "//flutter/impeller/renderer:embed_embed_vk_compute_shaders", "//flutter/skia:skia_public", "//flutter/testing:dynamic_symbols", "//flutter/third_party/googletest:gmock_config", "//flutter/third_party/googletest:gtest_config" ],
-      "defines": [ "USE_OPENSSL=1", "__STDC_CONSTANT_MACROS", "__STDC_FORMAT_MACROS", "_FORTIFY_SOURCE=2", "_LIBCPP_DISABLE_AVAILABILITY=1", "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS", "_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS", "NDEBUG", "NVALGRIND", "DYNAMIC_ANNOTATIONS_ENABLED=0", "SK_TYPEFACE_FACTORY_CORETEXT", "SK_FONTMGR_CORETEXT_AVAILABLE", "SK_GL", "SK_METAL", "SK_CODEC_DECODES_JPEG", "SK_CODEC_DECODES_PNG", "SK_CODEC_DECODES_ICO", "SK_CODEC_DECODES_WEBP", "SK_HAS_WUFFS_LIBRARY", "SK_CODEC_DECODES_GIF", "SK_XML", "FLUTTER_RUNTIME_MODE_DEBUG=1", "FLUTTER_RUNTIME_MODE_PROFILE=2", "FLUTTER_RUNTIME_MODE_RELEASE=3", "FLUTTER_RUNTIME_MODE_JIT_RELEASE=4", "DART_LEGACY_API=[[deprecated]]", "FLUTTER_RUNTIME_MODE=1", "FLUTTER_JIT_RUNTIME=1", "IMPELLER_DEBUG=1", "IMPELLER_ENABLE_CAPTURE=1", "IMPELLER_SUPPORTS_RENDERING=1", "IMPELLER_ENABLE_METAL=1", "IMPELLER_ENABLE_OPENGLES=1", "IMPELLER_ENABLE_VULKAN=1", "SK_CODEC_DECODES_BMP", "SK_CODEC_DECODES_WBMP", "SK_ENABLE_DUMP_GPU", "SK_FORCE_AAA", "SK_LEGACY_IGNORE_DRAW_VERTICES_BLEND_WITH_NO_SHADER", "SK_RESOLVE_FILTERS_BEFORE_RESTORE", "SK_DISABLE_LEGACY_METAL_BACKEND_SURFACE", "SK_DISABLE_LEGACY_SHADERCONTEXT", "SK_DISABLE_LOWP_RASTER_PIPELINE", "SK_FORCE_RASTER_PIPELINE_BLITTER", "SK_METAL_WAIT_UNTIL_SCHEDULED", "SK_DISABLE_EFFECT_DESERIALIZATION", "SK_ENABLE_PRECOMPILE", "SK_GANESH", "SK_USE_PERFETTO" ],
-      "deps": [ "//flutter/display_list:display_list", "//flutter/display_list:display_list_fixtures", "//flutter/display_list/testing:display_list_testing", "//flutter/testing:skia", "//flutter/testing:testing", "//third_party/libcxx:libcxx" ],
-      "externs": {
-
-      },
-      "frameworks": [ "Foundation.framework", "ApplicationServices.framework", "OpenGL.framework", "AppKit.framework", "Metal.framework" ],
-      "include_dirs": [ "//", "//out/host_debug/gen/", "//third_party/libcxx/include/", "//third_party/libcxxabi/include/", "//flutter/build/secondary/third_party/libcxx/config/", "//flutter/", "//out/host_debug/gen/flutter/", "//out/host_debug/gen/flutter/impeller/runtime_stage/", "//flutter/third_party/flatbuffers/include/", "//flutter/third_party/skia/", "//flutter/third_party/googletest/googlemock/include/", "//flutter/third_party/googletest/googletest/include/" ],
-      "ldflags": [ "--target=x86_64-apple-macos", "-arch", "x86_64", "-nostdlib++", "-Wl,-dead_strip", "-Wl,-search_paths_first", "-L.", "-Wl,-rpath,@loader_path/.", "-Wl,-rpath,/usr/local/lib/.", "-Wl,-rpath,@loader_path/../../..", "-Wl,-pie" ],
-      "libs": [ "dl" ],
-      "metadata": {
-
-      },
-      "outputs": [ "//out/host_debug/display_list_unittests" ],
-      "public": "*",
-      "sources": [ "//flutter/display_list/benchmarking/dl_complexity_unittests.cc", "//flutter/display_list/display_list_unittests.cc", "//flutter/display_list/dl_color_unittests.cc", "//flutter/display_list/dl_paint_unittests.cc", "//flutter/display_list/dl_vertices_unittests.cc", "//flutter/display_list/effects/dl_color_filter_unittests.cc", "//flutter/display_list/effects/dl_color_source_unittests.cc", "//flutter/display_list/effects/dl_image_filter_unittests.cc", "//flutter/display_list/effects/dl_mask_filter_unittests.cc", "//flutter/display_list/effects/dl_path_effect_unittests.cc", "//flutter/display_list/geometry/dl_region_unittests.cc", "//flutter/display_list/geometry/dl_rtree_unittests.cc", "//flutter/display_list/skia/dl_sk_conversions_unittests.cc", "//flutter/display_list/skia/dl_sk_paint_dispatcher_unittests.cc", "//flutter/display_list/utils/dl_matrix_clip_tracker_unittests.cc" ],
-      "testonly": true,
-      "toolchain": "//build/toolchain/mac:clang_x64",
-      "type": "executable",
-      "visibility": [ "*" ]
-   },
-   "//flutter/flow:flow_unittests": {
-      "all_dependent_configs": [ "//flutter/skia:fontmgr_mac_ct_public", "//flutter/skia:gpu_public", "//flutter/skia:gpu_shared_public", "//flutter/skia:jpeg_encode_public", "//flutter/skia:png_encode_public", "//flutter/skia:webp_encode_public", "//flutter/skia:jpeg_decode_public", "//flutter/skia:png_decode_public", "//flutter/skia:webp_decode_public", "//flutter/skia:wuffs_public", "//flutter/skia:xml_public" ],
-      "allow_circular_includes_from": [  ],
-      "asmflags": [ "-fno-strict-aliasing", "-fstack-protector-all", "--target=x86_64-apple-macos", "-arch", "x86_64", "-fcolor-diagnostics" ],
-      "cflags": [ "-fno-strict-aliasing", "-fstack-protector-all", "--target=x86_64-apple-macos", "-arch", "x86_64", "-fcolor-diagnostics", "-Wall", "-Wextra", "-Wendif-labels", "-Werror", "-Wno-missing-field-initializers", "-Wno-unused-parameter", "-Wno-unused-but-set-parameter", "-Wno-unused-but-set-variable", "-Wno-implicit-int-float-conversion", "-Wno-deprecated-copy", "-Wno-psabi", "-Wno-deprecated-literal-operator", "-Wno-unqualified-std-cast-call", "-Wno-non-c-typedef-for-linkage", "-Wno-range-loop-construct", "-Wunguarded-availability", "-Wno-deprecated-declarations", "-fvisibility=hidden", "-Wstring-conversion", "-Wnewline-eof", "-O2", "-fno-ident", "-fdata-sections", "-ffunction-sections", "-g2", "-Wunreachable-code", "-Wno-newline-eof" ],
-      "cflags_c": [ "-std=c99" ],
-      "cflags_cc": [ "-fvisibility-inlines-hidden", "-std=c++17", "-fno-rtti", "-nostdinc++", "-nostdinc++", "-fvisibility=hidden", "-fno-exceptions", "-stdlib=libc++", "-Wno-inconsistent-missing-override" ],
-      "cflags_objcc": [ "-fvisibility-inlines-hidden", "-fobjc-call-cxx-cdtors", "-std=c++17", "-fno-rtti", "-nostdinc++", "-nostdinc++", "-fvisibility=hidden", "-fno-exceptions", "-Wno-unguarded-availability" ],
-      "check_includes": true,
-      "configs": [ "//build/config:feature_flags", "//build/config/compiler:compiler", "//build/config/compiler:cxx_version_default", "//build/config/compiler:compiler_arm_fpu", "//build/config/compiler:chromium_code", "//build/config/compiler:default_include_dirs", "//build/config/compiler:no_rtti", "//build/config/compiler:runtime_library", "//third_party/libcxxabi:libcxxabi_config", "//third_party/libcxx:libcxx_config", "//build/config/gcc:no_exceptions", "//build/config/gcc:symbol_visibility_hidden", "//build/config:symbol_visibility_hidden", "//build/config/mac:sdk", "//build/config/clang:extra_warnings", "//build/config/clang:find_bad_constructs", "//build/config:release", "//build/config/compiler:optimize", "//build/config/compiler:default_optimization", "//build/config/compiler:symbols", "//build/config:default_libs", "//build/config/mac:mac_dynamic_flags", "//build/config/mac:mac_executable_flags", "//flutter/skia:fontmgr_mac_ct_public", "//flutter/skia:gpu_public", "//flutter/skia:gpu_shared_public", "//flutter/skia:jpeg_encode_public", "//flutter/skia:png_encode_public", "//flutter/skia:webp_encode_public", "//flutter/skia:jpeg_decode_public", "//flutter/skia:png_decode_public", "//flutter/skia:webp_decode_public", "//flutter/skia:wuffs_public", "//flutter/skia:xml_public", "//flutter:config", "//flutter/common:flutter_config", "//flutter/display_list:display_list_config", "//flutter/impeller:impeller_public_config", "//flutter/impeller/runtime_stage:runtime_stage_config", "//flutter/third_party/flatbuffers:flatbuffers_public_configs", "//flutter/impeller/renderer:embed_embed_mtl_compute_shaders", "//flutter/impeller/renderer:reflect_reflect_mtl_compute_shaders", "//flutter/impeller/renderer:embed_embed_vk_compute_shaders", "//flutter/skia:skia_public", "//flutter/third_party/txt:txt_config", "//flutter/third_party/harfbuzz:harfbuzz_config", "//flutter/third_party/icu:icu_config", "//flutter/third_party/googletest:gmock_config", "//flutter/third_party/googletest:gtest_config", "//third_party/dart/runtime:dart_public_config" ],
-      "defines": [ "USE_OPENSSL=1", "__STDC_CONSTANT_MACROS", "__STDC_FORMAT_MACROS", "_FORTIFY_SOURCE=2", "_LIBCPP_DISABLE_AVAILABILITY=1", "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS", "_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS", "NDEBUG", "NVALGRIND", "DYNAMIC_ANNOTATIONS_ENABLED=0", "SK_TYPEFACE_FACTORY_CORETEXT", "SK_FONTMGR_CORETEXT_AVAILABLE", "SK_GL", "SK_METAL", "SK_CODEC_DECODES_JPEG", "SK_CODEC_DECODES_PNG", "SK_CODEC_DECODES_ICO", "SK_CODEC_DECODES_WEBP", "SK_HAS_WUFFS_LIBRARY", "SK_CODEC_DECODES_GIF", "SK_XML", "FLUTTER_RUNTIME_MODE_DEBUG=1", "FLUTTER_RUNTIME_MODE_PROFILE=2", "FLUTTER_RUNTIME_MODE_RELEASE=3", "FLUTTER_RUNTIME_MODE_JIT_RELEASE=4", "DART_LEGACY_API=[[deprecated]]", "FLUTTER_RUNTIME_MODE=1", "FLUTTER_JIT_RUNTIME=1", "IMPELLER_DEBUG=1", "IMPELLER_ENABLE_CAPTURE=1", "IMPELLER_SUPPORTS_RENDERING=1", "IMPELLER_ENABLE_METAL=1", "IMPELLER_ENABLE_OPENGLES=1", "IMPELLER_ENABLE_VULKAN=1", "SK_CODEC_DECODES_BMP", "SK_CODEC_DECODES_WBMP", "SK_ENABLE_DUMP_GPU", "SK_FORCE_AAA", "SK_LEGACY_IGNORE_DRAW_VERTICES_BLEND_WITH_NO_SHADER", "SK_RESOLVE_FILTERS_BEFORE_RESTORE", "SK_DISABLE_LEGACY_METAL_BACKEND_SURFACE", "SK_DISABLE_LEGACY_SHADERCONTEXT", "SK_DISABLE_LOWP_RASTER_PIPELINE", "SK_FORCE_RASTER_PIPELINE_BLITTER", "SK_METAL_WAIT_UNTIL_SCHEDULED", "SK_DISABLE_EFFECT_DESERIALIZATION", "SK_ENABLE_PRECOMPILE", "SK_GANESH", "SK_USE_PERFETTO", "U_USING_ICU_NAMESPACE=0", "U_ENABLE_DYLOAD=0", "USE_CHROMIUM_ICU=1", "U_ENABLE_TRACING=1", "U_ENABLE_RESOURCE_TRACING=0", "U_STATIC_IMPLEMENTATION", "ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_FILE" ],
-      "deps": [ "//flutter/common/graphics:graphics", "//flutter/display_list/testing:display_list_testing", "//flutter/flow:flow", "//flutter/flow:flow_fixtures", "//flutter/flow:flow_testing", "//flutter/fml:fml", "//flutter/shell/common:base64", "//flutter/skia:skia", "//flutter/testing:skia", "//flutter/testing:testing_lib", "//flutter/third_party/googletest:gtest", "//third_party/dart/runtime:libdart_jit", "//third_party/libcxx:libcxx" ],
-      "externs": {
-
-      },
-      "frameworks": [ "Foundation.framework", "ApplicationServices.framework", "OpenGL.framework", "AppKit.framework", "Metal.framework" ],
-      "include_dirs": [ "//", "//out/host_debug/gen/", "//third_party/libcxx/include/", "//third_party/libcxxabi/include/", "//flutter/build/secondary/third_party/libcxx/config/", "//flutter/", "//out/host_debug/gen/flutter/", "//out/host_debug/gen/flutter/impeller/runtime_stage/", "//flutter/third_party/flatbuffers/include/", "//flutter/third_party/skia/", "//flutter/third_party/txt/src/", "//flutter/third_party/harfbuzz/src/", "//flutter/third_party/icu/source/common/", "//flutter/third_party/icu/source/i18n/", "//flutter/third_party/googletest/googlemock/include/", "//flutter/third_party/googletest/googletest/include/", "//third_party/dart/runtime/", "//third_party/dart/runtime/include/" ],
-      "ldflags": [ "--target=x86_64-apple-macos", "-arch", "x86_64", "-nostdlib++", "-Wl,-dead_strip", "-Wl,-search_paths_first", "-L.", "-Wl,-rpath,@loader_path/.", "-Wl,-rpath,/usr/local/lib/.", "-Wl,-rpath,@loader_path/../../..", "-Wl,-pie" ],
-      "libs": [ "dl", "pthread" ],
-      "metadata": {
-
-      },
-      "outputs": [ "//out/host_debug/flow_unittests" ],
-      "public": "*",
-      "sources": [ "//flutter/flow/diff_context_unittests.cc", "//flutter/flow/embedded_view_params_unittests.cc", "//flutter/flow/flow_run_all_unittests.cc", "//flutter/flow/flow_test_utils.cc", "//flutter/flow/flow_test_utils.h", "//flutter/flow/frame_timings_recorder_unittests.cc", "//flutter/flow/gl_context_switch_unittests.cc", "//flutter/flow/layers/backdrop_filter_layer_unittests.cc", "//flutter/flow/layers/checkerboard_layertree_unittests.cc", "//flutter/flow/layers/clip_path_layer_unittests.cc", "//flutter/flow/layers/clip_rect_layer_unittests.cc", "//flutter/flow/layers/clip_rrect_layer_unittests.cc", "//flutter/flow/layers/color_filter_layer_unittests.cc", "//flutter/flow/layers/container_layer_unittests.cc", "//flutter/flow/layers/display_list_layer_unittests.cc", "//flutter/flow/layers/image_filter_layer_unittests.cc", "//flutter/flow/layers/layer_state_stack_unittests.cc", "//flutter/flow/layers/layer_tree_unittests.cc", "//flutter/flow/layers/offscreen_surface_unittests.cc", "//flutter/flow/layers/opacity_layer_unittests.cc", "//flutter/flow/layers/performance_overlay_layer_unittests.cc", "//flutter/flow/layers/platform_view_layer_unittests.cc", "//flutter/flow/layers/shader_mask_layer_unittests.cc", "//flutter/flow/layers/texture_layer_unittests.cc", "//flutter/flow/layers/transform_layer_unittests.cc", "//flutter/flow/mutators_stack_unittests.cc", "//flutter/flow/raster_cache_unittests.cc", "//flutter/flow/skia_gpu_object_unittests.cc", "//flutter/flow/stopwatch_dl_unittests.cc", "//flutter/flow/stopwatch_unittests.cc", "//flutter/flow/surface_frame_unittests.cc", "//flutter/flow/testing/mock_layer_unittests.cc", "//flutter/flow/testing/mock_texture_unittests.cc", "//flutter/flow/texture_unittests.cc" ],
-      "testonly": true,
-      "toolchain": "//build/toolchain/mac:clang_x64",
-      "type": "executable",
-      "visibility": [ "*" ]
-   },
-   "//flutter/fml:fml_arc_unittests": {
-      "all_dependent_configs": [ "//flutter/skia:fontmgr_mac_ct_public", "//flutter/skia:gpu_public", "//flutter/skia:gpu_shared_public", "//flutter/skia:jpeg_encode_public", "//flutter/skia:png_encode_public", "//flutter/skia:webp_encode_public", "//flutter/skia:jpeg_decode_public", "//flutter/skia:png_decode_public", "//flutter/skia:webp_decode_public", "//flutter/skia:wuffs_public", "//flutter/skia:xml_public" ],
-      "allow_circular_includes_from": [  ],
-      "asmflags": [ "-fno-strict-aliasing", "-fstack-protector-all", "--target=x86_64-apple-macos", "-arch", "x86_64", "-fcolor-diagnostics" ],
-      "cflags": [ "-fno-strict-aliasing", "-fstack-protector-all", "--target=x86_64-apple-macos", "-arch", "x86_64", "-fcolor-diagnostics", "-Wall", "-Wextra", "-Wendif-labels", "-Werror", "-Wno-missing-field-initializers", "-Wno-unused-parameter", "-Wno-unused-but-set-parameter", "-Wno-unused-but-set-variable", "-Wno-implicit-int-float-conversion", "-Wno-deprecated-copy", "-Wno-psabi", "-Wno-deprecated-literal-operator", "-Wno-unqualified-std-cast-call", "-Wno-non-c-typedef-for-linkage", "-Wno-range-loop-construct", "-Wunguarded-availability", "-Wno-deprecated-declarations", "-fvisibility=hidden", "-Wstring-conversion", "-Wnewline-eof", "-O2", "-fno-ident", "-fdata-sections", "-ffunction-sections", "-g2", "-Wunreachable-code", "-Wno-newline-eof" ],
-      "cflags_c": [ "-std=c99" ],
-      "cflags_cc": [ "-fvisibility-inlines-hidden", "-std=c++17", "-fno-rtti", "-nostdinc++", "-nostdinc++", "-fvisibility=hidden", "-fno-exceptions", "-stdlib=libc++", "-Wno-inconsistent-missing-override" ],
-      "cflags_objcc": [ "-Werror=overriding-method-mismatch", "-Werror=undeclared-selector", "-fapplication-extension", "-fobjc-arc", "-fvisibility-inlines-hidden", "-fobjc-call-cxx-cdtors", "-std=c++17", "-fno-rtti", "-nostdinc++", "-nostdinc++", "-fvisibility=hidden", "-fno-exceptions", "-Wno-unguarded-availability" ],
-      "check_includes": true,
-      "configs": [ "//build/config:feature_flags", "//build/config/compiler:compiler", "//build/config/compiler:cxx_version_default", "//build/config/compiler:compiler_arm_fpu", "//build/config/compiler:chromium_code", "//build/config/compiler:default_include_dirs", "//build/config/compiler:no_rtti", "//build/config/compiler:runtime_library", "//third_party/libcxxabi:libcxxabi_config", "//third_party/libcxx:libcxx_config", "//build/config/gcc:no_exceptions", "//build/config/gcc:symbol_visibility_hidden", "//build/config:symbol_visibility_hidden", "//build/config/mac:sdk", "//build/config/clang:extra_warnings", "//build/config/clang:find_bad_constructs", "//build/config:release", "//build/config/compiler:optimize", "//build/config/compiler:default_optimization", "//build/config/compiler:symbols", "//build/config:default_libs", "//build/config/mac:mac_dynamic_flags", "//build/config/mac:mac_executable_flags", "//flutter/skia:fontmgr_mac_ct_public", "//flutter/skia:gpu_public", "//flutter/skia:gpu_shared_public", "//flutter/skia:jpeg_encode_public", "//flutter/skia:png_encode_public", "//flutter/skia:webp_encode_public", "//flutter/skia:jpeg_decode_public", "//flutter/skia:png_decode_public", "//flutter/skia:webp_decode_public", "//flutter/skia:wuffs_public", "//flutter/skia:xml_public", "//flutter:config", "//flutter/common:flutter_config", "//flutter/testing:dynamic_symbols", "//flutter/display_list:display_list_config", "//flutter/impeller:impeller_public_config", "//flutter/impeller/runtime_stage:runtime_stage_config", "//flutter/third_party/flatbuffers:flatbuffers_public_configs", "//flutter/impeller/renderer:embed_embed_mtl_compute_shaders", "//flutter/impeller/renderer:reflect_reflect_mtl_compute_shaders", "//flutter/impeller/renderer:embed_embed_vk_compute_shaders", "//flutter/skia:skia_public", "//flutter/third_party/googletest:gmock_config", "//flutter/third_party/googletest:gtest_config" ],
-      "defines": [ "USE_OPENSSL=1", "__STDC_CONSTANT_MACROS", "__STDC_FORMAT_MACROS", "_FORTIFY_SOURCE=2", "_LIBCPP_DISABLE_AVAILABILITY=1", "_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS", "_LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS", "NDEBUG", "NVALGRIND", "DYNAMIC_ANNOTATIONS_ENABLED=0", "SK_TYPEFACE_FACTORY_CORETEXT", "SK_FONTMGR_CORETEXT_AVAILABLE", "SK_GL", "SK_METAL", "SK_CODEC_DECODES_JPEG", "SK_CODEC_DECODES_PNG", "SK_CODEC_DECODES_ICO", "SK_CODEC_DECODES_WEBP", "SK_HAS_WUFFS_LIBRARY", "SK_CODEC_DECODES_GIF", "SK_XML", "FLUTTER_RUNTIME_MODE_DEBUG=1", "FLUTTER_RUNTIME_MODE_PROFILE=2", "FLUTTER_RUNTIME_MODE_RELEASE=3", "FLUTTER_RUNTIME_MODE_JIT_RELEASE=4", "DART_LEGACY_API=[[deprecated]]", "FLUTTER_RUNTIME_MODE=1", "FLUTTER_JIT_RUNTIME=1", "IMPELLER_DEBUG=1", "IMPELLER_ENABLE_CAPTURE=1", "IMPELLER_SUPPORTS_RENDERING=1", "IMPELLER_ENABLE_METAL=1", "IMPELLER_ENABLE_OPENGLES=1", "IMPELLER_ENABLE_VULKAN=1", "SK_CODEC_DECODES_BMP", "SK_CODEC_DECODES_WBMP", "SK_ENABLE_DUMP_GPU", "SK_FORCE_AAA", "SK_LEGACY_IGNORE_DRAW_VERTICES_BLEND_WITH_NO_SHADER", "SK_RESOLVE_FILTERS_BEFORE_RESTORE", "SK_DISABLE_LEGACY_METAL_BACKEND_SURFACE", "SK_DISABLE_LEGACY_SHADERCONTEXT", "SK_DISABLE_LOWP_RASTER_PIPELINE", "SK_FORCE_RASTER_PIPELINE_BLITTER", "SK_METAL_WAIT_UNTIL_SCHEDULED", "SK_DISABLE_EFFECT_DESERIALIZATION", "SK_ENABLE_PRECOMPILE", "SK_GANESH", "SK_USE_PERFETTO" ],
-      "deps": [ "//flutter/fml:fml", "//flutter/fml:fml_fixtures", "//flutter/testing:testing", "//third_party/libcxx:libcxx" ],
-      "externs": {
-
-      },
-      "frameworks": [ "Foundation.framework", "ApplicationServices.framework", "OpenGL.framework", "AppKit.framework", "Metal.framework" ],
-      "include_dirs": [ "//", "//out/host_debug/gen/", "//third_party/libcxx/include/", "//third_party/libcxxabi/include/", "//flutter/build/secondary/third_party/libcxx/config/", "//flutter/", "//out/host_debug/gen/flutter/", "//out/host_debug/gen/flutter/impeller/runtime_stage/", "//flutter/third_party/flatbuffers/include/", "//flutter/third_party/skia/", "//flutter/third_party/googletest/googlemock/include/", "//flutter/third_party/googletest/googletest/include/" ],
-      "ldflags": [ "--target=x86_64-apple-macos", "-arch", "x86_64", "-nostdlib++", "-Wl,-dead_strip", "-Wl,-search_paths_first", "-L.", "-Wl,-rpath,@loader_path/.", "-Wl,-rpath,/usr/local/lib/.", "-Wl,-rpath,@loader_path/../../..", "-Wl,-pie" ],
-      "libs": [ "dl" ],
-      "metadata": {
-
-      },
-      "outputs": [ "//out/host_debug/fml_arc_unittests" ],
-      "public": "*",
-      "sources": [ "//flutter/fml/platform/darwin/scoped_nsobject_arc_unittests.mm", "//flutter/fml/platform/darwin/weak_nsobject_arc_unittests.mm" ],
-      "testonly": true,
-      "toolchain": "//build/toolchain/mac:clang_x64",
-      "type": "executable",
-      "visibility": [ "*" ]
-   }
-}
-''';
-
-String gnDescOutputEmpty({required String gnPattern}) => '''
-The input $gnPattern matches no targets, configs or files.
-''';
diff --git a/tools/engine_tool/test/query_command_test.dart b/tools/engine_tool/test/query_command_test.dart
index 6e8576d..4599a68 100644
--- a/tools/engine_tool/test/query_command_test.dart
+++ b/tools/engine_tool/test/query_command_test.dart
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:convert';
 import 'dart:ffi' show Abi;
 
 import 'package:engine_tool/src/commands/command_runner.dart';
 import 'package:logging/logging.dart' as log;
 import 'package:test/test.dart';
 
-import 'fixtures.dart' as fixtures;
 import 'src/test_build_configs.dart';
 import 'utils.dart';
 
@@ -17,19 +17,11 @@
     return logs.map((log.LogRecord r) => r.message).toList();
   }
 
-  final cannedProcesses = <CannedProcess>[
-    CannedProcess(
-      (command) => command.contains('desc'),
-      stdout: fixtures.gnDescOutput(),
-    ),
-  ];
-
   test('query command returns builds for the host platform.', () async {
     final testEnvironment = TestEnvironment.withTestEngine(
       // Intentionally use the default parameter to make it explicit.
       // ignore: avoid_redundant_argument_values
       abi: Abi.linuxX64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnvironment.cleanup);
 
@@ -132,7 +124,6 @@
       // Intentionally use the default parameter to make it explicit.
       // ignore: avoid_redundant_argument_values
       abi: Abi.linuxX64,
-      cannedProcesses: cannedProcesses,
     );
     addTearDown(testEnvironment.cleanup);
 
@@ -206,9 +197,7 @@
   });
 
   test('query command with --all returns all builds.', () async {
-    final testEnvironment = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
-    );
+    final testEnvironment = TestEnvironment.withTestEngine();
     addTearDown(testEnvironment.cleanup);
 
     final linuxBuilders1 = TestBuilderConfig();
@@ -313,7 +302,34 @@
 
   test('query targets', () async {
     final testEnvironment = TestEnvironment.withTestEngine(
-      cannedProcesses: cannedProcesses,
+      cannedProcesses: [
+        CannedProcess(
+          (command) => command.contains('desc'),
+          stdout: jsonEncode({
+            '//flutter/display_list:display_list_unittests': {
+              'outputs': [
+                '//out/host_debug/display_list_unittests',
+              ],
+              'testonly': true,
+              'type': 'executable',
+            },
+            '//flutter/flow:flow_unittests': {
+              'outputs': [
+                '//out/host_debug/flow_unittests',
+              ],
+              'testonly': true,
+              'type': 'executable',
+            },
+            '//flutter/fml:fml_arc_unittests': {
+              'outputs': [
+                '//out/host_debug/fml_arc_unittests',
+              ],
+              'testonly': true,
+              'type': 'executable',
+            },
+          }),
+        ),
+      ],
     );
     addTearDown(testEnvironment.cleanup);