test: cover OrmDirtyEncryptedTest and teardown

test/test_orm_dirty_encrypted.rb

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+require 'minitest/autorun'
+require 'prism'
+require 'tmpdir'
+
+# Session 55/56/58 left this as a known, unverified gap: Dirty (ActiveModel::
+# Dirty-lite) reads @attributes directly, so on an `encrypts`-backed column
+# every dirty-tracking call (changed_attributes/changes/attribute_was/
+# attribute_change) leaked raw ciphertext instead of the plaintext the
+# model's own reader returns. This file is the end-to-end proof that the
+# fix (Dirty#humanize_dirty_value, Encryption's setter no-op-on-same-value)
+# actually closes that gap, on the same non-deterministic and deterministic
+# split test_orm_encryption.rb already exercises for plain reads.
+class OrmDirtyEncryptedTest < Minitest::Test
+  def setup
+    @dir = Dir.mktmpdir('prism-dirty-encrypted-store')
+    @store = Prism::Orm::Store.new(File.join(@dir, 'test.pstore'))
+    @store.create_table(:patients, %w[id name ssn notes])
+    Prism::Orm::Encryption.primary_key = 'test-primary-key-do-not-use-in-prod'
+
+    patient_class = Class.new(Prism::Orm::Model) do
+      table_name :patients
+      encrypts :ssn, deterministic: true
+      encrypts :notes
+    end
+    patient_class.store = @store
+    Object.const_set(:DirtyEncryptedPatient, patient_class)
+  end
+
+  def teardown
+    FileUtils.remove_entry(@dir)
+    Prism::Orm::Encryption.primary_key = nil
+    Object.send(:remove_const, :DirtyEncryptedPatient) if Object.const_defined?(:DirtyEncryptedPatient)
+  end
+
+  def test_new_record_reports_plaintext_not_ciphertext_in_changes
+    patient = DirtyEncryptedPatient.new(name: 'Alice', ssn: '123-45-6789', notes: 'note')
+    old_value, new_value = patient.changes['ssn']
+    assert_nil old_value
+    assert_equal '123-45-6789', new_value
+    refute_includes patient.changes['ssn'].to_s, patient['ssn'].to_s
+  end
+
+  def test_changed_attributes_reports_plaintext_old_value
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'old note')
+    patient.notes = 'new note'
+    assert_equal 'old note', patient.changed_attributes['notes']
+  end
+
+  def test_attribute_was_and_attribute_change_report_plaintext_on_deterministic_column
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'n')
+    patient.ssn = '999-99-9999'
+    assert_equal '123-45-6789', patient.attribute_was('ssn')
+    assert_equal ['123-45-6789', '999-99-9999'], patient.attribute_change('ssn')
+  end
+
+  def test_attribute_was_and_attribute_change_report_plaintext_on_nondeterministic_column
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'old note')
+    patient.notes = 'new note'
+    assert_equal 'old note', patient.attribute_was('notes')
+    assert_equal ['old note', 'new note'], patient.attribute_change('notes')
+  end
+
+  def test_reassigning_the_same_plaintext_on_a_nondeterministic_column_is_not_dirty
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'same note')
+    raw_before = patient['notes']
+    patient.notes = 'same note'
+    refute patient.attribute_changed?('notes'), 'assigning the value already held must not be dirty'
+    refute patient.changed?
+    assert_equal raw_before, patient['notes'], 'a true no-op must not even rewrite the ciphertext'
+  end
+
+  def test_reassigning_the_same_plaintext_on_a_deterministic_column_is_not_dirty
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'n')
+    patient.ssn = '123-45-6789'
+    refute patient.attribute_changed?('ssn')
+    refute patient.changed?
+  end
+
+  def test_saved_changes_after_create_reports_plaintext
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'note')
+    assert_equal [nil, '123-45-6789'], patient.saved_changes['ssn']
+    assert_equal [nil, 'note'], patient.saved_changes['notes']
+  end
+
+  def test_saved_changes_after_update_reports_plaintext_and_only_the_real_change
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'old note')
+    patient.update!(notes: 'new note')
+    assert_equal ['old note', 'new note'], patient.saved_changes['notes']
+    refute_includes patient.saved_changes.keys, 'ssn'
+  end
+
+  def test_restore_attributes_still_reverts_the_underlying_ciphertext_correctly
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'old note')
+    patient.notes = 'new note'
+    patient.restore_attributes(['notes'])
+    assert_equal 'old note', patient.notes
+    refute patient.changed?
+  end
+
+  def test_a_corrupted_current_value_does_not_block_overwriting_it
+    patient = DirtyEncryptedPatient.create!(name: 'Alice', ssn: '123-45-6789', notes: 'note')
+    row = @store.find(:patients, patient.id)
+    tampered = row.dup
+    tampered['notes'] = row['notes'].sub(/^./) { |c| c == 'A' ? 'B' : 'A' }
+    @store.update(:patients, patient.id, tampered)
+    reloaded = DirtyEncryptedPatient.find(patient.id)
+    reloaded.notes = 'fresh note'
+    assert_equal 'fresh note', reloaded.notes
+  end
+end