diff --git a/test/sensor_unittest.cpp b/test/sensor_unittest.cpp
new file mode 100644
index 0000000..905b011
--- /dev/null
+++ b/test/sensor_unittest.cpp
@@ -0,0 +1,51 @@
+#include "env_mock.hpp"
+#include "hwmonio_mock.hpp"
+#include "sensor.hpp"
+
+#include <memory>
+#include <utility>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+class SensorTest : public ::testing::Test
+{
+  protected:
+    void SetUp() override
+    {
+        envIntf = nullptr;
+    }
+};
+
+using ::testing::Eq;
+using ::testing::Return;
+using ::testing::StrictMock;
+
+TEST_F(SensorTest, BasicConstructorTest)
+{
+    /* Constructor test with nothing in an rcList or GPIO chip. */
+
+    StrictMock<EnvMock> eMock;
+    envIntf = &eMock;
+
+    auto sensorKey = std::make_pair(std::string("temp"), std::string("5"));
+    std::unique_ptr<hwmonio::HwmonIOInterface> hwmonio_mock =
+        std::make_unique<hwmonio::HwmonIOMock>();
+    std::string path = "/";
+
+    /* Always calls GPIOCHIP and GPIO checks, returning empty string. */
+    EXPECT_CALL(eMock, getEnv(Eq("GPIOCHIP"), Eq(sensorKey)))
+        .WillOnce(Return(""));
+    EXPECT_CALL(eMock, getEnv(Eq("GPIO"), Eq(sensorKey))).WillOnce(Return(""));
+
+    /* Always calls GAIN and OFFSET, can use ON_CALL instead of EXPECT_CALL */
+    EXPECT_CALL(eMock, getEnv(Eq("GAIN"), Eq(sensorKey))).WillOnce(Return(""));
+    EXPECT_CALL(eMock, getEnv(Eq("OFFSET"), Eq(sensorKey)))
+        .WillOnce(Return(""));
+    EXPECT_CALL(eMock, getEnv(Eq("REMOVERCS"), Eq(sensorKey)))
+        .WillOnce(Return(""));
+
+    auto sensor =
+        std::make_unique<sensor::Sensor>(sensorKey, hwmonio_mock.get(), path);
+    EXPECT_FALSE(sensor == nullptr);
+}