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2999e7b925
Co-authored-by: Claude Fable 5 <noreply@anthropic.com> Co-authored-by: J. Nick Koston <nick@koston.org>
32 lines
1.4 KiB
C++
32 lines
1.4 KiB
C++
#include <gtest/gtest.h>
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#include <cstdint>
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#include <vector>
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#include "esphome/components/modbus_controller/modbus_controller.h"
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namespace esphome::modbus_controller::testing {
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// The coil write factory packs into an exact-size payload. Pinned at one past the protocol maximum
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// because a fixed pack buffer sized for the maximum would silently truncate there while the quantity
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// field still claimed every coil - and the truncated frame would fit the RTU limit and go on the wire
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// malformed. Built at its true byte count, the oversize frame is refused by the hub's size check with
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// a log instead.
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TEST(ModbusCommandPayload, CoilWritePayloadIsExactSizedNotTruncated) {
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ModbusController controller;
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std::vector<bool> coils(modbus::MAX_NUM_OF_COILS_TO_WRITE + 1, true);
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auto cmd = ModbusCommandItem::create_write_multiple_coils(&controller, 0x10, coils);
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EXPECT_EQ(cmd.payload.size(), modbus::packed_bit_bytes(coils.size()));
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}
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// LSB-first packing with zeroed pad bits, matching the wire layout the PDU builders produce.
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TEST(ModbusCommandPayload, CoilWritePacksLsbFirstWithZeroPad) {
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ModbusController controller;
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const std::vector<bool> coils{true, false, true, true};
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auto cmd = ModbusCommandItem::create_write_multiple_coils(&controller, 0x10, coils);
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ASSERT_EQ(cmd.payload.size(), 1u);
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EXPECT_EQ(cmd.payload.data()[0], 0b00001101);
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}
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} // namespace esphome::modbus_controller::testing
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