Add DTDEncoder tests.

Author: gk-brown

.idea/compiler.xml

@@ -1,3 +1,3 @@
 rootProject.name = 'Sierra'
 
-include 'sierra', 'sierra-previewer', 'sierra-test', 'sierra-tools:dtd-encoder'
+include 'sierra', 'sierra-test', 'sierra-tools:dtd-encoder', 'sierra-tools:previewer'

.idea/gradle.xml

@@ -0,0 +1 @@
+sierra.dtd

settings.gradle

@@ -18,9 +18,15 @@ plugins {
 
 dependencies {
     implementation project(':sierra')
+    implementation 'com.fifesoft:rsyntaxtextarea:3.6.0'
 
-    implementation "com.formdev:flatlaf:${flatLafVersion}"
-    implementation "com.formdev:flatlaf-extras:${flatLafVersion}"
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.10.1'
+
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.named('test', Test) {
+    useJUnitPlatform()
 }
 
 application {

sierra-tools/dtd-encoder/.gitignore

@@ -0,0 +1,31 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.httprpc.sierra.tools;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+public class DTDEncoderTest {
+    @Test
+    public void testCustomBinding() throws Exception {
+        DTDEncoder.main(new String[] {"syntax-text-area=org.fife.ui.rsyntaxtextarea.RSyntaxTextArea"});
+    }
+
+    @Test
+    public void testInvalidBinding() {
+        assertThrows(IllegalArgumentException.class, () -> DTDEncoder.main(new String[] {"xyz"}));
+    }
+}

sierra-tools/dtd-encoder/build.gradle

@@ -0,0 +1,38 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+plugins {
+    id 'application'
+}
+
+dependencies {
+    implementation project(':sierra')
+    implementation "com.formdev:flatlaf:${flatLafVersion}"
+    implementation "com.formdev:flatlaf-extras:${flatLafVersion}"
+    implementation 'com.fifesoft:rsyntaxtextarea:3.6.0'
+    implementation 'com.fifesoft:autocomplete:3.3.2'
+
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.10.1'
+    testImplementation 'org.mockito:mockito-core:5.9.0'
+
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+}
+
+tasks.named('test', Test) {
+    useJUnitPlatform()
+}
+
+application {
+    mainClass = 'org.httprpc.sierra.previewer.SierraPreviewerApp'
+}