Add demo integration (#2085)

esphome/components/demo/demo_fan.h

@@ -0,0 +1,54 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/fan/fan_state.h"
+
+namespace esphome {
+namespace demo {
+
+enum class DemoFanType {
+  TYPE_1,
+  TYPE_2,
+  TYPE_3,
+  TYPE_4,
+};
+
+class DemoFan : public Component {
+ public:
+  void set_type(DemoFanType type) { type_ = type; }
+  void set_fan(fan::FanState *fan) { fan_ = fan; }
+  void setup() override {
+    fan::FanTraits traits{};
+
+    // oscillation
+    // speed
+    // direction
+    // speed_count
+    switch (type_) {
+      case DemoFanType::TYPE_1:
+        break;
+      case DemoFanType::TYPE_2:
+        traits.set_oscillation(true);
+        break;
+      case DemoFanType::TYPE_3:
+        traits.set_direction(true);
+        traits.set_speed(true);
+        traits.set_supported_speed_count(5);
+        break;
+      case DemoFanType::TYPE_4:
+        traits.set_direction(true);
+        traits.set_speed(true);
+        traits.set_supported_speed_count(100);
+        traits.set_oscillation(true);
+        break;
+    }
+
+    this->fan_->set_traits(traits);
+  }
+
+  fan::FanState *fan_;
+  DemoFanType type_;
+};
+
+}  // namespace demo
+}  // namespace esphome