Anvil v1.0.0 -- Arduino build tool with HAL and test scaffolding

Single-binary CLI that scaffolds testable Arduino projects, compiles,
uploads, and monitors serial output. Templates embed a hardware
abstraction layer, Google Mock infrastructure, and CMake-based host
tests so application logic can be verified without hardware.

Commands: new, doctor, setup, devices, build, upload, monitor
39 Rust tests (21 unit, 18 integration)
Cross-platform: Linux and Windows

templates/basic/test/test_unit.cpp.tmpl

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+#include <gtest/gtest.h>
+#include <gmock/gmock.h>
+
+#include "hal.h"
+#include "mock_hal.h"
+#include "{{PROJECT_NAME}}_app.h"
+
+using ::testing::_;
+using ::testing::AnyNumber;
+using ::testing::Return;
+using ::testing::HasSubstr;
+
+// ============================================================================
+// Unit Tests -- verify exact HAL interactions
+// ============================================================================
+
+class BlinkAppUnitTest : public ::testing::Test {
+protected:
+    void SetUp() override {
+        ON_CALL(mock_, millis()).WillByDefault(Return(0));
+        ON_CALL(mock_, digitalRead(_)).WillByDefault(Return(HIGH));
+        EXPECT_CALL(mock_, serialBegin(_)).Times(AnyNumber());
+        EXPECT_CALL(mock_, serialPrintln(_)).Times(AnyNumber());
+        EXPECT_CALL(mock_, millis()).Times(AnyNumber());
+    }
+
+    ::testing::NiceMock<MockHal> mock_;
+};
+
+TEST_F(BlinkAppUnitTest, BeginConfiguresPins) {
+    BlinkApp app(&mock_, 13, 2);
+
+    EXPECT_CALL(mock_, pinMode(13, OUTPUT)).Times(1);
+    EXPECT_CALL(mock_, pinMode(2, INPUT_PULLUP)).Times(1);
+    EXPECT_CALL(mock_, serialBegin(115200)).Times(1);
+
+    app.begin();
+}
+
+TEST_F(BlinkAppUnitTest, StartsInSlowMode) {
+    BlinkApp app(&mock_);
+    app.begin();
+
+    EXPECT_FALSE(app.fastMode());
+    EXPECT_EQ(app.interval(), BlinkApp::SLOW_INTERVAL_MS);
+}
+
+TEST_F(BlinkAppUnitTest, TogglesLedAfterInterval) {
+    BlinkApp app(&mock_);
+
+    ON_CALL(mock_, millis()).WillByDefault(Return(0));
+    app.begin();
+
+    ON_CALL(mock_, millis()).WillByDefault(Return(500));
+    EXPECT_CALL(mock_, digitalWrite(13, _)).Times(1);
+    app.update();
+}
+
+TEST_F(BlinkAppUnitTest, DoesNotToggleBeforeInterval) {
+    BlinkApp app(&mock_);
+
+    ON_CALL(mock_, millis()).WillByDefault(Return(0));
+    app.begin();
+
+    ON_CALL(mock_, millis()).WillByDefault(Return(499));
+    EXPECT_CALL(mock_, digitalWrite(_, _)).Times(0);
+    app.update();
+}
+
+TEST_F(BlinkAppUnitTest, ButtonPressSwitchesToFastMode) {
+    BlinkApp app(&mock_, 13, 2);
+
+    ON_CALL(mock_, millis()).WillByDefault(Return(0));
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(HIGH));
+    app.begin();
+
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(LOW));
+    EXPECT_CALL(mock_, serialPrintln(HasSubstr("FAST"))).Times(1);
+    app.update();
+
+    EXPECT_TRUE(app.fastMode());
+    EXPECT_EQ(app.interval(), BlinkApp::FAST_INTERVAL_MS);
+}
+
+TEST_F(BlinkAppUnitTest, SecondButtonPressReturnsToSlowMode) {
+    BlinkApp app(&mock_, 13, 2);
+
+    ON_CALL(mock_, millis()).WillByDefault(Return(0));
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(HIGH));
+    app.begin();
+
+    // First press: fast mode
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(LOW));
+    app.update();
+    EXPECT_TRUE(app.fastMode());
+
+    // Release
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(HIGH));
+    app.update();
+
+    // Second press: back to slow
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(LOW));
+    EXPECT_CALL(mock_, serialPrintln(HasSubstr("SLOW"))).Times(1);
+    app.update();
+
+    EXPECT_FALSE(app.fastMode());
+}
+
+TEST_F(BlinkAppUnitTest, HoldingButtonDoesNotRepeatToggle) {
+    BlinkApp app(&mock_, 13, 2);
+
+    ON_CALL(mock_, millis()).WillByDefault(Return(0));
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(HIGH));
+    app.begin();
+
+    ON_CALL(mock_, digitalRead(2)).WillByDefault(Return(LOW));
+    app.update();
+    EXPECT_TRUE(app.fastMode());
+
+    // Still held -- should NOT toggle again
+    app.update();
+    app.update();
+    EXPECT_TRUE(app.fastMode());
+}