Add scheduled method to email

Added scheduled method to EmailMicroservice and endpoints to UserController for customers and houses(not working yet). Fixed some issues from the M2 review and updated the class diagram.

electricityTarifMicroservice/src/test/java/cz/muni/fi/pa165/electricityTarifMicroservice/electricityprices/ElectricityPriceRepositoryTest.java

+package cz.muni.fi.pa165.electricityTarifMicroservice.electricityprices;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
+import org.springframework.boot.test.autoconfigure.orm.jpa.TestEntityManager;
+import org.springframework.test.context.junit.jupiter.SpringExtension;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@ExtendWith(SpringExtension.class)
+@DataJpaTest
+class ElectricityPriceRepositoryTest {
+	@Autowired
+	private TestEntityManager entityManager;
+	@Autowired
+	private ElectricityPriceRepository electricityPriceRepository;
+
+	@Test
+	void deleteCompany() {
+		String companyId1 = "01";
+		var price1 = createElectricityPrice(companyId1, 0.0,0.0);
+
+		String companyId2 = "02";
+		var price2 = createElectricityPrice(companyId2, 0.0,0.0);
+
+		electricityPriceRepository.deleteCompany(companyId1);
+
+		assertThat(electricityPriceRepository.findAll()).hasSize(1).contains(price2);
+		assertThat(electricityPriceRepository.findAll()).hasSize(1).doesNotContain(price1);
+
+		electricityPriceRepository.deleteCompany(companyId2);
+
+		assertThat(electricityPriceRepository.findAll()).hasSize(0);
+	}
+
+	@Test
+	void averagePriceLowTariff() {
+		String companyId1 = "01";
+		double lowTariff1 = 300.0;
+		createElectricityPrice(companyId1, lowTariff1, 0.0);
+
+		assertThat(electricityPriceRepository.averagePriceLowTariff()).isEqualTo(lowTariff1);
+
+		String companyId2 = "02";
+		double lowTariff2 = 200.0;
+		createElectricityPrice(companyId2, lowTariff2, 0.0);
+
+		assertThat(electricityPriceRepository.averagePriceLowTariff()).isEqualTo((lowTariff1 + lowTariff2)/2);
+
+		electricityPriceRepository.deleteCompany(companyId1);
+
+		assertThat(electricityPriceRepository.averagePriceLowTariff()).isEqualTo(lowTariff2);
+
+		electricityPriceRepository.deleteCompany(companyId2);
+	}
+
+	@Test
+	void averagePriceHighTariff() {
+		String companyId1 = "01";
+		double highTariff1 = 500.0;
+		createElectricityPrice(companyId1, 0.0, highTariff1);
+
+		assertThat(electricityPriceRepository.averagePriceHighTariff()).isEqualTo(highTariff1);
+
+		String companyId2 = "02";
+		double highTariff2 = 300.0;
+		createElectricityPrice(companyId2, 0.0, highTariff2);
+
+		assertThat(electricityPriceRepository.averagePriceHighTariff()).isEqualTo((highTariff1 + highTariff2)/2);
+
+		electricityPriceRepository.deleteCompany(companyId1);
+
+		assertThat(electricityPriceRepository.averagePriceHighTariff()).isEqualTo(highTariff2);
+
+		electricityPriceRepository.deleteCompany(companyId2);
+	}
+
+	private ElectricityPrice createElectricityPrice(String companyId, double lowTariff, double highTariff){
+		ElectricityPrice price = ElectricityPrice
+				.builder()
+				.companyId(companyId)
+				.priceHighTariff(highTariff)
+				.priceLowTariff(lowTariff)
+				.build();
+		entityManager.persist(price);
+		return price;
+	}
+}
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