Add rudimentary apple-related classes to fakebuildapi.

These fakes won't behave at all like real implementations at this time. In fact, invoking some of their methods (or accessing their fields) may result in an error. This serves, however, as the initial check-in which can be iterated on and improved later.

RELNOTES: None.
PiperOrigin-RevId: 202525168
diff --git a/src/test/java/com/google/devtools/build/skydoc/BUILD b/src/test/java/com/google/devtools/build/skydoc/BUILD
index e5a80fd..5e98b40 100644
--- a/src/test/java/com/google/devtools/build/skydoc/BUILD
+++ b/src/test/java/com/google/devtools/build/skydoc/BUILD
@@ -51,3 +51,10 @@
     input_file = "multiple_rules_test/input.txt",
     skydoc = "//src/main/java/com/google/devtools/build/skydoc",
 )
+
+skydoc_test(
+    name = "apple_basic_test",
+    golden_file = "apple_basic_test/golden.txt",
+    input_file = "apple_basic_test/input.txt",
+    skydoc = "//src/main/java/com/google/devtools/build/skydoc",
+)
diff --git a/src/test/java/com/google/devtools/build/skydoc/apple_basic_test/golden.txt b/src/test/java/com/google/devtools/build/skydoc/apple_basic_test/golden.txt
new file mode 100644
index 0000000..36642e4
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/skydoc/apple_basic_test/golden.txt
@@ -0,0 +1,4 @@
+apple_related_rule
+This rule does apple-related things.
+first,second,third,fourth
+
diff --git a/src/test/java/com/google/devtools/build/skydoc/apple_basic_test/input.txt b/src/test/java/com/google/devtools/build/skydoc/apple_basic_test/input.txt
new file mode 100644
index 0000000..165176e
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/skydoc/apple_basic_test/input.txt
@@ -0,0 +1,20 @@
+def exercise_the_api():
+    var1 = apple_common.platform_type
+    var2 = apple_common.AppleDynamicFramework
+
+exercise_the_api()
+
+def my_rule_impl(ctx):
+    return struct()
+
+
+apple_related_rule = rule(
+    implementation = my_rule_impl,
+    doc = "This rule does apple-related things.",
+    attrs = {
+        "first": attr.label(mandatory = True, allow_files = True, single_file = True),
+        "second": attr.string_dict(mandatory = True),
+        "third": attr.output(mandatory = True),
+        "fourth": attr.bool(default = False, mandatory = False),
+    },
+)