adding test_requires() for 2.0 migration of force_host_context

conans/client/graph/graph_manager.py

@@ -298,6 +298,15 @@ def _resolve_graph(self, root_node, profile_host, profile_build, graph_lock, bui
     @staticmethod
     def _get_recipe_build_requires(conanfile, default_context):
         conanfile.build_requires = _RecipeBuildRequires(conanfile, default_context)
+
+        class TestRequirements:
+            def __init__(self, build_requires):
+                self._build_requires = build_requires
+
+            def __call__(self, ref):
+                self._build_requires(ref, force_host_context=True)
+
+        conanfile.test_requires = TestRequirements(conanfile.build_requires)
         if hasattr(conanfile, "build_requirements"):
             with get_env_context_manager(conanfile):
                 with conanfile_exception_formatter(str(conanfile), "build_requirements"):

conans/test/integration/graph/core/test_build_requires.py

@@ -1,3 +1,5 @@
+import textwrap
+
 import six
 from parameterized import parameterized
 
@@ -399,3 +401,29 @@ def test_build_require_link_order(self):
                          dependents=[], closure=[gazelle, grass])
         self.assertListEqual(list(cheetah.conanfile.deps_cpp_info.libs),
                              ['mylibgazelle0.1lib', 'mylibgrass0.1lib'])
+
+    def test_test_require(self):
+        # app -(tr)-> gtest/0.1
+        # This test should survive in 2.0
+        tool_ref = ConanFileReference.loads("gtest/0.1")
+        self._cache_recipe(tool_ref, GenConanfile("gtest", "0.1"))
+
+        conanfile = textwrap.dedent("""
+            from conans import ConanFile
+            class Pkg(ConanFile):
+                name = "app"
+                version = "0.1"
+                def build_requirements(self):
+                    self.test_requires("gtest/0.1")
+            """)
+        deps_graph = self.build_graph(conanfile)
+
+        # Build requires always apply to the consumer
+        self.assertEqual(2, len(deps_graph.nodes))
+        app = deps_graph.root
+        tool = app.dependencies[0].dst
+
+        self._check_node(app, "app/0.1@", deps=[], build_deps=[tool], dependents=[],
+                         closure=[tool])
+        self._check_node(tool, "gtest/0.1#123", deps=[], build_deps=[],
+                         dependents=[app], closure=[])