UnsupportedOperationException when creating 'scratch file' in IntelliJ IDEA

Signed-off-by: Dmytro Nosan <[email protected]>

Author: nosan

spring-javaformat-intellij-idea/spring-javaformat-intellij-idea-plugin/src/test/java/io/spring/format/formatter/intellij/formatting/SpringJavaFormatFormattingServiceTests.java

@@ -28,8 +28,10 @@
 import com.intellij.openapi.fileTypes.PlainTextFileType;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
-import com.intellij.openapi.vfs.VirtualFileSystem;
+import com.intellij.openapi.vfs.local.CoreLocalFileSystem;
+import com.intellij.openapi.vfs.local.CoreLocalVirtualFile;
 import com.intellij.psi.PsiFile;
+import com.intellij.testFramework.LightVirtualFile;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.io.TempDir;
 
@@ -84,18 +86,29 @@ void formatDocumentAppliesFormatting(@TempDir Path tempDir) throws Exception {
 				+ "\tpublic void hello() {"
 				+ "\tString value =\t\"Hello World\";}}");
 		FormattingContext formattingContext = mock(FormattingContext.class);
-		VirtualFile virtualFile = mock(VirtualFile.class);
-		VirtualFileSystem virtualFileSystem = mock(VirtualFileSystem.class);
-		given(virtualFile.getFileSystem()).willReturn(virtualFileSystem);
+		VirtualFile virtualFile = new CoreLocalVirtualFile(new CoreLocalFileSystem(), tempDir.resolve("Hello.java"));
 		given(formattingContext.getVirtualFile()).willReturn(virtualFile);
-		given(virtualFileSystem.getNioPath(virtualFile)).willReturn(tempDir.resolve("Hello.java"));
 		this.service.formatDocument(document, Collections.emptyList(), formattingContext, false, false);
-		assertThat(document.getText()).isEqualTo("public class Hello {"
-				+ "\n\n"
+		assertThat(document.getText()).isEqualTo("public class Hello {\n\n"
 				+ "    public void hello() {\n"
 				+ "        String value = \"Hello World\";\n"
-				+ "    }\n"
-				+ "\n"
+				+ "    }\n\n"
+				+ "}");
+	}
+
+	@Test
+	void formatDocumentAppliesFormatting() {
+		Document document = mockDocument("public class Hello{"
+				+ "\tpublic void hello() {"
+				+ "\tString value =\t\"Hello World\";}}");
+		FormattingContext formattingContext = mock(FormattingContext.class);
+		VirtualFile virtualFile = new LightVirtualFile("Hello.java", document.getText());
+		given(formattingContext.getVirtualFile()).willReturn(virtualFile);
+		this.service.formatDocument(document, Collections.emptyList(), formattingContext, false, false);
+		assertThat(document.getText()).isEqualTo("public class Hello {\n\n"
+				+ "\tpublic void hello() {\n"
+				+ "\t\tString value = \"Hello World\";\n"
+				+ "\t}\n\n"
 				+ "}");
 	}