Check for duplicate entries in build.prop in validation script

Test: Added Unit test
Bug: 143013566
Change-Id: Ida14507a4a6034990bc81d5263ef1cea34f589c1
diff --git a/tools/releasetools/test_validate_target_files.py b/tools/releasetools/test_validate_target_files.py
index 6504515..ca70ca8 100644
--- a/tools/releasetools/test_validate_target_files.py
+++ b/tools/releasetools/test_validate_target_files.py
@@ -25,10 +25,9 @@
 import test_utils
 from rangelib import RangeSet
 from validate_target_files import (ValidateVerifiedBootImages,
-                                   ValidateFileConsistency)
+                                   ValidateFileConsistency, CheckBuildPropDuplicity)
 from verity_utils import CreateVerityImageBuilder
 
-
 class ValidateTargetFilesTest(test_utils.ReleaseToolsTestCase):
 
   def setUp(self):
@@ -329,3 +328,38 @@
     with zipfile.ZipFile(input_file) as input_zip:
       info_dict = {'extfs_sparse_flag': '-s'}
       ValidateFileConsistency(input_zip, input_tmp, info_dict)
+
+  @staticmethod
+  def make_build_prop(build_prop):
+    input_tmp = common.MakeTempDir()
+    system_dir = os.path.join(input_tmp, 'SYSTEM')
+    os.makedirs(system_dir)
+    prop_file = os.path.join(system_dir, 'build.prop')
+    with open(prop_file, 'w') as output_file:
+      output_file.write("\n".join(build_prop))
+    return input_tmp
+
+  def test_checkDuplicateProps_noDuplicate(self):
+    build_prop = [
+        'ro.odm.build.date.utc=1578430045',
+        'ro.odm.build.fingerprint='
+        'google/coral/coral:10/RP1A.200325.001/6337676:user/dev-keys',
+        'ro.product.odm.device=coral',
+    ]
+    input_tmp = ValidateTargetFilesTest.make_build_prop(build_prop)
+    CheckBuildPropDuplicity(input_tmp)
+
+  def test_checkDuplicateProps_withDuplicate(self):
+    build_prop = [
+        'ro.odm.build.date.utc=1578430045',
+        'ro.odm.build.date.utc=1578430049',
+        'ro.odm.build.fingerprint='
+        'google/coral/coral:10/RP1A.200325.001/6337676:user/dev-keys',
+        'ro.product.odm.device=coral',
+    ]
+    input_tmp = ValidateTargetFilesTest.make_build_prop({
+        'ODM/etc/build.prop': '\n'.join(build_prop),
+    })
+
+    self.assertRaises(ValueError, CheckBuildPropDuplicity,
+                        input_tmp)