Add a test for `java_binary` without sources.

PiperOrigin-RevId: 933630740
Change-Id: Ibb7112caefa50b3ba8b4425d294781b978549a4f

test/bazel/BUILD.bazel

diff --git a/test/bazel/BUILD.bazel b/test/bazel/BUILD.bazel
new file mode 100644
index 0000000..50fff50
--- /dev/null
+++ b/test/bazel/BUILD.bazel
@@ -0,0 +1,11 @@
+load("@rules_testing//lib:util.bzl", "util")
+load("//java:java_binary.bzl", "java_binary")
+
+# Used in test/java/bazel/rules/java_binary_tests.bzl%_test_java_binary_empty_srcs
+util.helper_target(
+    java_binary,
+    name = "bin_without_srcs",
+    visibility = [
+        "//test/java/bazel/rules:__pkg__",
+    ],
+)

test/java/bazel/rules/java_binary_tests.bzl

diff --git a/test/java/bazel/rules/java_binary_tests.bzl b/test/java/bazel/rules/java_binary_tests.bzl
index 8c38504..8436e0e 100644
--- a/test/java/bazel/rules/java_binary_tests.bzl
+++ b/test/java/bazel/rules/java_binary_tests.bzl
@@ -1,6 +1,7 @@
 """Tests for the Bazel java_binary rule"""
 
 load("@rules_testing//lib:analysis_test.bzl", "analysis_test", "test_suite")
+load("@rules_testing//lib:truth.bzl", "matching")
 load("@rules_testing//lib:util.bzl", "util")
 load("//java:java_binary.bzl", "java_binary")
 load("//test/java/testutil:java_info_subject.bzl", "java_info_subject")
@@ -118,6 +119,19 @@
         ("--resources", "{package}/path/to/strip/bar.props:bar.props"),
     ])
 
+def _test_java_binary_empty_srcs(name):
+    analysis_test(
+        name = name,
+        impl = _test_java_binary_empty_srcs_impl,
+        target = "//test/bazel:bin_without_srcs",  # need a target not under a `/java/` segment
+        expect_failure = True,
+    )
+
+def _test_java_binary_empty_srcs_impl(env, target):
+    env.expect.that_target(target).failures().contains_predicate(matching.str_matches(
+        "need at least one of 'main_class' or Java source files",
+    ))
+
 def java_binary_tests(name):
     test_suite(
         name = name,
@@ -126,5 +140,6 @@
             _test_java_binary_javacopts_make_variable_expansion,
             _test_java_binary_javacopts_location_expansion,
             _test_java_binary_resource_strip_prefix,
+            _test_java_binary_empty_srcs,
         ],
     )