Add some jdk tests for execution modes (pantsbuild#6631)

Follow up for pantsbuild#6502

tests/python/pants_test/backend/jvm/tasks/jvm_compile/test_jvm_compile.py

@@ -6,9 +6,13 @@
 
 import os
 
+from pants.backend.jvm.subsystems.zinc import Zinc
 from pants.backend.jvm.targets.java_library import JavaLibrary
 from pants.backend.jvm.tasks.classpath_products import ClasspathProducts
 from pants.backend.jvm.tasks.jvm_compile.jvm_compile import JvmCompile
+from pants.backend.jvm.tasks.jvm_compile.zinc.zinc_compile import BaseZincCompile
+from pants.backend.jvm.tasks.nailgun_task import NailgunTaskBase
+from pants.base.build_environment import get_buildroot
 from pants_test.task_test_base import TaskTestBase
 
 
@@ -44,3 +48,30 @@ def test_if_runtime_classpath_exists(self):
     resulting_classpath = task.create_runtime_classpath()
     self.assertEqual([('default', pre_init_runtime_entry), ('default', compile_entry)],
       resulting_classpath.get_for_target(target))
+
+
+class BaseZincCompileJDKTest(TaskTestBase):
+  DEFAULT_CONF = 'default'
+  old_cwd = os.getcwd()
+
+  @classmethod
+  def task_type(cls):
+    return BaseZincCompile
+
+  def setUp(self):
+    os.chdir(get_buildroot())
+    super(BaseZincCompileJDKTest, self).setUp()
+
+  def tearDown(self):
+    os.chdir(self.old_cwd)
+    super(BaseZincCompileJDKTest, self).tearDown()
+
+  def test_subprocess_compile_jdk_being_symlink(self):
+    context = self.context(target_roots=[])
+    zinc = Zinc.Factory.global_instance().create(context.products, NailgunTaskBase.SUBPROCESS)
+    self.assertTrue(os.path.islink(zinc.dist.home))
+
+  def test_hermetic_jdk_being_underlying_dist(self):
+    context = self.context(target_roots=[])
+    zinc = Zinc.Factory.global_instance().create(context.products, NailgunTaskBase.HERMETIC)
+    self.assertFalse(os.path.islink(zinc.dist.home))