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Added Unit tests
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Lines changed: 171 additions & 5 deletions

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‎src/main/java/org/example/http/MimeTypeDetector.java‎

Lines changed: 8 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -54,19 +54,24 @@ private MimeTypeDetector() {
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* @param filename the name of the file (t.ex., "index.html", "style.css")
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* @return the MIME type string (t.ex, "text/html; charset=UTF-8")
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*/
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public static String detectMimeType(String filename) {
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String octet = "application/octet-stream";
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if (filename == null || filename.isEmpty()) {
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return "application/octet-stream";
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return octet;
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}
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// Find the last dot to get extension
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int lastDot = filename.lastIndexOf('.');
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if (lastDot == -1 || lastDot == filename.length() - 1) {
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// No extension or dot at end
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return "application/octet-stream";
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return octet;
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}
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String extension = filename.substring(lastDot).toLowerCase();
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return MIME_TYPES.getOrDefault(extension, "application/octet-stream");
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return MIME_TYPES.getOrDefault(extension, octet);
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}
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}

‎src/test/java/org/example/http/MimeTypeDetectorTest.java‎

Lines changed: 163 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,165 @@
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package org.example.http;
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public class MimeTypeDetectorTest {
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}
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import org.junit.jupiter.api.DisplayName;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.CsvSource;
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import static org.assertj.core.api.Assertions.*;
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class MimeTypeDetectorTest {
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@Test
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@DisplayName("Should detect HTML files")
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void detectMimeType_html() {
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assertThat(MimeTypeDetector.detectMimeType("index.html"))
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.isEqualTo("text/html; charset=UTF-8");
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assertThat(MimeTypeDetector.detectMimeType("page.htm"))
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.isEqualTo("text/html; charset=UTF-8");
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}
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@Test
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@DisplayName("Should detect CSS files")
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void detectMimeType_css() {
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assertThat(MimeTypeDetector.detectMimeType("style.css"))
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.isEqualTo("text/css; charset=UTF-8");
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}
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@Test
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@DisplayName("Should detect JavaScript files")
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void detectMimeType_javascript() {
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assertThat(MimeTypeDetector.detectMimeType("app.js"))
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.isEqualTo("application/javascript; charset=UTF-8");
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}
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@Test
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@DisplayName("Should detect JSON files")
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void detectMimeType_json() {
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assertThat(MimeTypeDetector.detectMimeType("data.json"))
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.isEqualTo("application/json; charset=UTF-8");
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}
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@Test
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@DisplayName("Should detect PNG images")
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void detectMimeType_png() {
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assertThat(MimeTypeDetector.detectMimeType("logo.png"))
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.isEqualTo("image/png");
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}
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@Test
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@DisplayName("Should detect JPEG images with .jpg extension")
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void detectMimeType_jpg() {
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assertThat(MimeTypeDetector.detectMimeType("photo.jpg"))
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.isEqualTo("image/jpeg");
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}
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@Test
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@DisplayName("Should detect JPEG images with .jpeg extension")
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void detectMimeType_jpeg() {
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assertThat(MimeTypeDetector.detectMimeType("photo.jpeg"))
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.isEqualTo("image/jpeg");
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}
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@Test
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@DisplayName("Should detect PDF files")
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void detectMimeType_pdf() {
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assertThat(MimeTypeDetector.detectMimeType("document.pdf"))
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.isEqualTo("application/pdf");
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}
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@Test
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@DisplayName("Should be case-insensitive")
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void detectMimeType_caseInsensitive() {
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assertThat(MimeTypeDetector.detectMimeType("INDEX.HTML"))
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.isEqualTo("text/html; charset=UTF-8");
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assertThat(MimeTypeDetector.detectMimeType("Style.CSS"))
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.isEqualTo("text/css; charset=UTF-8");
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assertThat(MimeTypeDetector.detectMimeType("PHOTO.PNG"))
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.isEqualTo("image/png");
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}
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@Test
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@DisplayName("Should return default MIME type for unknown extensions")
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void detectMimeType_unknownExtension() {
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assertThat(MimeTypeDetector.detectMimeType("file.xyz"))
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.isEqualTo("application/octet-stream");
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assertThat(MimeTypeDetector.detectMimeType("document.unknown"))
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.isEqualTo("application/octet-stream");
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}
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@Test
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@DisplayName("Should handle files without extension")
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void detectMimeType_noExtension() {
97+
assertThat(MimeTypeDetector.detectMimeType("README"))
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.isEqualTo("application/octet-stream");
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assertThat(MimeTypeDetector.detectMimeType("Makefile"))
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.isEqualTo("application/octet-stream");
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}
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@Test
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@DisplayName("Should handle null filename")
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void detectMimeType_null() {
107+
assertThat(MimeTypeDetector.detectMimeType(null))
108+
.isEqualTo("application/octet-stream");
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}
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@Test
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@DisplayName("Should handle empty filename")
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void detectMimeType_empty() {
114+
assertThat(MimeTypeDetector.detectMimeType(""))
115+
.isEqualTo("application/octet-stream");
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}
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@Test
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@DisplayName("Should handle filename ending with dot")
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void detectMimeType_endsWithDot() {
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assertThat(MimeTypeDetector.detectMimeType("file."))
122+
.isEqualTo("application/octet-stream");
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}
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@Test
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@DisplayName("Should handle path with directories")
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void detectMimeType_withPath() {
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assertThat(MimeTypeDetector.detectMimeType("/var/www/index.html"))
129+
.isEqualTo("text/html; charset=UTF-8");
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assertThat(MimeTypeDetector.detectMimeType("css/styles/main.css"))
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.isEqualTo("text/css; charset=UTF-8");
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}
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@Test
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@DisplayName("Should handle multiple dots in filename")
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void detectMimeType_multipleDots() {
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assertThat(MimeTypeDetector.detectMimeType("jquery.min.js"))
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.isEqualTo("application/javascript; charset=UTF-8");
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assertThat(MimeTypeDetector.detectMimeType("bootstrap.bundle.min.css"))
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.isEqualTo("text/css; charset=UTF-8");
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}
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// Parametriserad test för många filtyper på en gång
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@ParameterizedTest
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@CsvSource({
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"test.html, text/html; charset=UTF-8",
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"style.css, text/css; charset=UTF-8",
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"app.js, application/javascript; charset=UTF-8",
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"data.json, application/json; charset=UTF-8",
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"image.png, image/png",
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"photo.jpg, image/jpeg",
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"doc.pdf, application/pdf",
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"icon.svg, image/svg+xml",
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"favicon.ico, image/x-icon",
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"video.mp4, video/mp4",
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"audio.mp3, audio/mpeg"
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})
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@DisplayName("Should detect common file types")
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void detectMimeType_commonTypes(String filename, String expectedMimeType) {
162+
assertThat(MimeTypeDetector.detectMimeType(filename))
163+
.isEqualTo(expectedMimeType);
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}
165+
}

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