[atm90e32] Verify offset calibration writes (#18701)

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>

tests/components/atm90e32/__init__.py

@@ -0,0 +1,5 @@
+from tests.testing_helpers import ComponentManifestOverride
+
+
+def override_manifest(manifest: ComponentManifestOverride) -> None:
+    manifest.dependencies = manifest.dependencies + ["sensor", "spi"]

tests/components/atm90e32/offset_register_verification_test.cpp

@@ -0,0 +1,62 @@
+#include <gtest/gtest.h>
+
+#include "esphome/components/atm90e32/atm90e32.h"
+
+namespace esphome::atm90e32::testing {
+
+TEST(ATM90E32OffsetRegisterVerification, AcceptsExactSignedReadback) {
+  EXPECT_TRUE(offset_register_value_matches(0x007B, 123));
+  EXPECT_TRUE(offset_register_value_matches(0xFF85, -123));
+}
+
+TEST(ATM90E32OffsetRegisterVerification, RejectsMismatchedReadback) {
+  EXPECT_FALSE(offset_register_value_matches(0x007C, 123));
+  EXPECT_FALSE(offset_register_value_matches(0xFF84, -123));
+}
+
+TEST(ATM90E32OffsetRestoreState, ReportsVerifiedStoredValuesAsRestored) {
+  const auto state = resolve_offset_restore_state(true, true, false);
+
+  EXPECT_TRUE(state.restored);
+  EXPECT_TRUE(state.values_verified);
+}
+
+TEST(ATM90E32OffsetRestoreState, ReportsVerifiedConfigFallbackAsNotRestored) {
+  const auto state = resolve_offset_restore_state(true, false, true);
+
+  EXPECT_FALSE(state.restored);
+  EXPECT_TRUE(state.values_verified);
+}
+
+TEST(ATM90E32OffsetRestoreState, ReportsFailedConfigFallbackAsUnverified) {
+  const auto state = resolve_offset_restore_state(true, false, false);
+
+  EXPECT_FALSE(state.restored);
+  EXPECT_FALSE(state.values_verified);
+}
+
+TEST(ATM90E32OffsetRestoreState, ReportsConfigWithoutStoredValuesAsNotRestored) {
+  const auto state = resolve_offset_restore_state(false, true, false);
+
+  EXPECT_FALSE(state.restored);
+  EXPECT_TRUE(state.values_verified);
+}
+
+TEST(ATM90E32OffsetPersistence, RollsBackStoredValuesOrZeroSentinel) {
+  const OffsetCalibration previous[3]{{1, -1}, {2, -2}, {3, -3}};
+  OffsetCalibration rollback[3]{};
+
+  prepare_offset_rollback(previous, true, rollback);
+  for (uint8_t phase = 0; phase < 3; phase++) {
+    EXPECT_EQ(rollback[phase].first_offset, previous[phase].first_offset);
+    EXPECT_EQ(rollback[phase].second_offset, previous[phase].second_offset);
+  }
+
+  prepare_offset_rollback(previous, false, rollback);
+  for (const auto &phase : rollback) {
+    EXPECT_EQ(phase.first_offset, 0);
+    EXPECT_EQ(phase.second_offset, 0);
+  }
+}
+
+}  // namespace esphome::atm90e32::testing