Windows: fix tests for native test wrapper (#129)

All tests work with
`--incompatible_windows_native_test_wrapper`
except for the ones already broken on Windows
(//tests:analysis_test_e2e_test and
//tests:unittest_e2e_test).

See bazelbuild/bazel#6622

tests/BUILD

@@ -8,7 +8,7 @@ load(":partial_tests.bzl", "partial_test_suite")
 load(":paths_tests.bzl", "paths_test_suite")
 load(":selects_tests.bzl", "selects_test_suite")
 load(":sets_tests.bzl", "sets_test_suite")
-load(":shell_tests.bzl", "shell_test_suite")
+load(":shell_tests.bzl", "shell_args_test_gen", "shell_test_suite")
 load(":structs_tests.bzl", "structs_test_suite")
 load(":types_tests.bzl", "types_test_suite")
 load(":unittest_tests.bzl", "unittest_passing_tests_suite")
@@ -84,3 +84,12 @@ sh_test(
     ],
     tags = ["local"],
 )
+
+shell_args_test_gen(
+    name = "shell_spawn_e2e_test_src",
+)
+
+sh_test(
+    name = "shell_spawn_e2e_test",
+    srcs = [":shell_spawn_e2e_test_src"],
+)

tests/shell_tests.bzl

@@ -52,8 +52,8 @@ def _shell_quote_test(ctx):
 
 shell_quote_test = unittest.make(_shell_quote_test)
 
-def _shell_spawn_e2e_test_impl(ctx):
-    """Test spawning a real shell."""
+def _shell_args_test_gen_impl(ctx):
+    """Test argument escaping: this rule writes a script for a sh_test."""
     args = [
         "foo",
         "foo bar",
@@ -83,19 +83,16 @@ def _shell_spawn_e2e_test_impl(ctx):
         "line tab\tcharacter $foo qu\"o\"te it'\\''s foo\\bar back`echo q`uote'",
         '[[ "${output}" == "${expected}" ]]',
     ])
-    script_file = ctx.actions.declare_file("%s.sh" % (ctx.label.name))
+    out = ctx.actions.declare_file(ctx.label.name + ".sh")
     ctx.actions.write(
-        output = script_file,
+        output = out,
         content = script_content,
         is_executable = True,
     )
-    return [
-        DefaultInfo(executable = script_file),
-    ]
+    return [DefaultInfo(files = depset([out]))]
 
-shell_spawn_e2e_test = rule(
-    test = True,
-    implementation = _shell_spawn_e2e_test_impl,
+shell_args_test_gen = rule(
+    implementation = _shell_args_test_gen_impl,
 )
 
 def shell_test_suite():
@@ -104,5 +101,4 @@ def shell_test_suite():
         "shell_tests",
         shell_array_literal_test,
         shell_quote_test,
-        shell_spawn_e2e_test,
     )