Create and integrate JavaBootstrap, and use fake top-level Java skylark objects for Skydoc.

RELNOTES: None.
PiperOrigin-RevId: 202697176

src/test/java/com/google/devtools/build/skydoc/BUILD

diff --git a/src/test/java/com/google/devtools/build/skydoc/BUILD b/src/test/java/com/google/devtools/build/skydoc/BUILD
index 1c495da..d235bf8 100644
--- a/src/test/java/com/google/devtools/build/skydoc/BUILD
+++ b/src/test/java/com/google/devtools/build/skydoc/BUILD
@@ -67,6 +67,13 @@
 )
 
 skydoc_test(
+    name = "java_basic_test",
+    golden_file = "testdata/java_basic_test/golden.txt",
+    input_file = "testdata/java_basic_test/input.bzl",
+    skydoc = "//src/main/java/com/google/devtools/build/skydoc",
+)
+
+skydoc_test(
     name = "multiple_files_test",
     golden_file = "testdata/multiple_files_test/golden.txt",
     input_file = "testdata/multiple_files_test/input.bzl",

src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/golden.txt

diff --git a/src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/golden.txt b/src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/golden.txt
new file mode 100644
index 0000000..274e1f2
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/golden.txt
@@ -0,0 +1,4 @@
+java_related_rule
+This rule does java-related things.
+first,second,third,fourth
+

src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/input.bzl

diff --git a/src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/input.bzl b/src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/input.bzl
new file mode 100644
index 0000000..f724b7d
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/skydoc/testdata/java_basic_test/input.bzl
@@ -0,0 +1,21 @@
+def exercise_the_api():
+    var1 = java_common.JavaRuntimeInfo
+    var2 = JavaInfo
+    var3 = java_proto_common
+
+exercise_the_api()
+
+def my_rule_impl(ctx):
+    return struct()
+
+
+java_related_rule = rule(
+    implementation = my_rule_impl,
+    doc = "This rule does java-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),
+    },
+)