Testing slices and evidence boundaries

package training.catalog;

import java.util.Optional;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.context.annotation.Import;
import org.springframework.security.test.context.support.WithMockUser;
import org.springframework.test.context.bean.override.mockito.MockitoBean;
import org.springframework.test.web.servlet.MockMvc;
import static org.mockito.BDDMockito.given;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

@WebMvcTest(ProductController.class)
@Import(ApiSecurity.class)
class ProductControllerTest {
    @Autowired MockMvc mvc;
    @MockitoBean ProductService products;
    @Test
    @WithMockUser(authorities="catalog:read")
    void knownProduct() throws Exception {
        given(products.find(42L)).willReturn(Optional.of(new ProductView(42L,"Notebook")));
        mvc.perform(get("/products/42"))
            .andExpect(status().isOk())
            .andExpect(jsonPath("$.id").value(42))
            .andExpect(jsonPath("$.name").value("Notebook"));
    }
}

This test requires the contextual controller/service contracts and managed test dependencies. Its assertions are intended, not an observed framework test run.

package training.catalog;

import java.time.Duration;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.runner.ApplicationContextRunner;
import static org.assertj.core.api.Assertions.assertThat;

class CatalogConfigurationTest {
    private final ApplicationContextRunner runner = new ApplicationContextRunner()
        .withUserConfiguration(CatalogConfiguration.class);
    @Test
    void bindsKnownProperties() {
        runner.withPropertyValues("catalog.max-page-size=20","catalog.timeout=2s")
            .run(context -> {
                assertThat(context).hasNotFailed();
                assertThat(context).hasSingleBean(CatalogProperties.class);
                assertThat(context.getBean(CatalogProperties.class).maxPageSize()).isEqualTo(20);
                assertThat(context.getBean(CatalogProperties.class).timeout()).isEqualTo(Duration.ofSeconds(2));
            });
    }
}

The fixture states intended assertions for the selected configuration. No context refresh or validator execution is claimed.