file storage test

build.gradle

@@ -19,6 +19,7 @@ dependencies {
     // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api
     testCompile group: 'org.junit.jupiter', name: 'junit-jupiter-api', version: '5.5.2'
     testCompile group: 'org.hamcrest', name: 'hamcrest-library', version: '2.2'
+    testCompile group: 'org.mockito', name: 'mockito-core', version:'3.1.0'
     compile group: 'org.codehaus.groovy', name: 'groovy-all', version: '3.0.0-beta-3'
     compile group: 'org.springframework', name:'spring-context', version: '5.2.0.RELEASE'
     compile group: 'net.sf.supercsv', name: 'super-csv', version: '2.4.0'

src/test/java/ninja/javafx/smartcsv/files/FileStorageTest.java

@@ -0,0 +1,112 @@
+package ninja.javafx.smartcsv.files;
+
+import ninja.javafx.smartcsv.FileReader;
+import ninja.javafx.smartcsv.FileWriter;
+import org.junit.Before;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+
+import java.io.File;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.*;
+import static org.mockito.Mockito.*;
+
+public class FileStorageTest {
+
+    private FileReader<String> reader;
+    private FileWriter<String> writer;
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // subject under test
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    private FileStorage<String> sut;
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // init
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    @BeforeEach
+    public void initialize() {
+        reader = mock(FileReader.class);
+        writer = mock(FileWriter.class);
+        sut = new FileStorage<>(reader, writer);
+    }
+
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    // tests
+    ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+    @Test
+    public void setFile_ShouldStoreFile() {
+
+        // pre execution assertion
+        assertThat("get file returns null",  sut.getFile(), nullValue());
+        assertThat("property is null", sut.fileProperty().isNull().get(), equalTo(true));
+
+        // execution
+        final File file = new File("file");
+        sut.setFile(file);
+
+        // assertion
+        assertThat("get file returns the file", sut.getFile(), sameInstance(file));
+        assertThat("property is not null", sut.fileProperty().isNull().get(), equalTo(false));
+    }
+
+    @Test
+    public void load_ShouldReadContentFromReader() throws Exception {
+        // setup
+        final File file = new File("file");
+        sut.setFile(file);
+        when(reader.getContent()).thenReturn("CONTENT");
+
+        // execution
+        sut.load();
+
+        // assertion
+        verify(reader).read(file);
+        assertThat("content is set", sut.getContent(), equalTo("CONTENT"));
+    }
+
+    @Test
+    public void load_ShouldResetFileChangedProperty() throws Exception {
+        // setup
+        sut.setFileChanged(true);
+        when(reader.getContent()).thenReturn("CONTENT");
+
+        // execution
+        sut.load();
+
+        // assertion
+        assertThat("file changed is reset", sut.isFileChanged(), equalTo(false));
+    }
+
+    @Test
+    public void save_ShouldWriteContentToWriter() throws Exception {
+        // setup
+        final String content = "CONTENT";
+        sut.setContent(content);
+        final File file = new File("file");
+        sut.setFile(file);
+
+        // execution
+        sut.save();
+
+        // assertion
+        verify(writer).setContent(content);
+        verify(writer).write(file);
+    }
+
+    @Test
+    public void save_ShouldResetFileChangedProperty() throws Exception {
+        // setup
+        sut.setFileChanged(true);
+
+        // execution
+        sut.save();
+
+        // assertion
+        assertThat("file changed is reset", sut.isFileChanged(), equalTo(false));
+    }
+
+}