diff --git a/scripts/construct_context_test.py b/scripts/construct_context_test.py
new file mode 100755
index 0000000..0b0b0a3
--- /dev/null
+++ b/scripts/construct_context_test.py
@@ -0,0 +1,81 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2020 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+"""Unit tests for construct_context.py."""
+
+import sys
+import unittest
+
+import construct_context as cc
+
+sys.dont_write_bytecode = True
+
+def construct_contexts(arglist):
+  args = cc.parse_args(arglist)
+  return cc.construct_contexts(args)
+
+classpaths = [
+  '--host-classpath-for-sdk', '28', 'out/zdir/z.jar',
+  '--target-classpath-for-sdk', '28', '/system/z.jar',
+  '--host-classpath-for-sdk', '29', 'out/xdir/x.jar:out/ydir/y.jar',
+  '--target-classpath-for-sdk', '29', '/system/x.jar:/product/y.jar',
+  '--host-classpath-for-sdk', 'any', 'out/adir/a.jar:out/android.hidl.manager-V1.0-java.jar:out/bdir/b.jar',
+  '--target-classpath-for-sdk', 'any', '/system/a.jar:/system/android.hidl.manager-V1.0-java.jar:/product/b.jar',
+]
+
+class ConstructContextTest(unittest.TestCase):
+  def test_construct_context_28(self):
+    args = ['--target-sdk-version', '28'] + classpaths
+    result = construct_contexts(args)
+    expect = ('class_loader_context_arg=--class-loader-context=PCL[]{PCL[out/xdir/x.jar]'
+      '#PCL[out/ydir/y.jar]'
+      '#PCL[out/adir/a.jar]'
+      '#PCL[out/android.hidl.manager-V1.0-java.jar]{PCL[out/android.hidl.base-V1.0-java.jar]}'
+      '#PCL[out/bdir/b.jar]}'
+      ' ; '
+      'stored_class_loader_context_arg=--stored-class-loader-context=PCL[]{PCL[/system/x.jar]'
+      '#PCL[/product/y.jar]'
+      '#PCL[/system/a.jar]'
+      '#PCL[/system/android.hidl.manager-V1.0-java.jar]{PCL[/system/android.hidl.base-V1.0-java.jar]}'
+      '#PCL[/product/b.jar]}')
+    self.assertEqual(result, expect)
+
+  def test_construct_context_29(self):
+    args = ['--target-sdk-version', '29'] + classpaths
+    result = construct_contexts(args)
+    expect = ('class_loader_context_arg=--class-loader-context=PCL[]{PCL[out/adir/a.jar]'
+      '#PCL[out/android.hidl.manager-V1.0-java.jar]{PCL[out/android.hidl.base-V1.0-java.jar]}'
+      '#PCL[out/bdir/b.jar]}'
+      ' ; '
+      'stored_class_loader_context_arg=--stored-class-loader-context=PCL[]{PCL[/system/a.jar]'
+      '#PCL[/system/android.hidl.manager-V1.0-java.jar]{PCL[/system/android.hidl.base-V1.0-java.jar]}'
+      '#PCL[/product/b.jar]}')
+    self.assertEqual(result, expect)
+
+  def test_construct_context_S(self):
+    args = ['--target-sdk-version', 'S'] + classpaths
+    result = construct_contexts(args)
+    expect = ('class_loader_context_arg=--class-loader-context=PCL[]{PCL[out/adir/a.jar]'
+      '#PCL[out/android.hidl.manager-V1.0-java.jar]{PCL[out/android.hidl.base-V1.0-java.jar]}'
+      '#PCL[out/bdir/b.jar]}'
+      ' ; '
+      'stored_class_loader_context_arg=--stored-class-loader-context=PCL[]{PCL[/system/a.jar]'
+      '#PCL[/system/android.hidl.manager-V1.0-java.jar]{PCL[/system/android.hidl.base-V1.0-java.jar]}'
+      '#PCL[/product/b.jar]}')
+    self.assertEqual(result, expect)
+
+if __name__ == '__main__':
+  unittest.main(verbosity=2)