chore: assert new expected behaviour in test

Author: simschla

lib/src/test/java/com/diffplug/spotless/npm/NodeServerLayoutTest.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2025 DiffPlug
+ *
+ * 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 com.diffplug.spotless.npm;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import com.diffplug.spotless.ResourceHarness;
+
+class NodeServerLayoutTest extends ResourceHarness {
+
+	@Test
+	void itCalculatesSameNodeModulesDirForSameContent() throws IOException {
+		File testDir = newFolder("build");
+		String packageJsonContent = prettierPackageJson(Collections.emptyMap());
+		String serveJsContent = "fun main() { console.log('Hello, world!'); }";
+		NodeServerLayout layout1 = new NodeServerLayout(testDir, packageJsonContent, serveJsContent);
+		NodeServerLayout layout2 = new NodeServerLayout(testDir, packageJsonContent, serveJsContent);
+
+		assertThat(layout1.nodeModulesDir()).isEqualTo(layout2.nodeModulesDir());
+	}
+
+	@Test
+	void itCalculatesDifferentNodeModulesDirForDifferentPackageJson() throws IOException {
+		File testDir = newFolder("build");
+		String packageJsonContent1 = prettierPackageJson(Collections.singletonMap("prettier-plugin-xy", "^2.0.0"));
+		String packageJsonContent2 = prettierPackageJson(Collections.singletonMap("prettier-plugin-xy", "^2.1.0"));
+		String serveJsContent = "fun main() { console.log('Hello, world!'); }";
+
+		NodeServerLayout layout1 = new NodeServerLayout(testDir, packageJsonContent1, serveJsContent);
+		NodeServerLayout layout2 = new NodeServerLayout(testDir, packageJsonContent2, serveJsContent);
+
+		assertThat(layout1.nodeModulesDir()).isNotEqualTo(layout2.nodeModulesDir());
+	}
+
+	@Test
+	void itCalculatesDifferentNodeModulesDirForDifferentServeJs() throws IOException {
+		File testDir = newFolder("build");
+		String packageJsonContent = prettierPackageJson(Collections.emptyMap());
+		String serveJsContent1 = "fun main() { console.log('Hello, world!'); }";
+		String serveJsContent2 = "fun main() { console.log('Goodbye, world!'); }";
+
+		NodeServerLayout layout1 = new NodeServerLayout(testDir, packageJsonContent, serveJsContent1);
+		NodeServerLayout layout2 = new NodeServerLayout(testDir, packageJsonContent, serveJsContent2);
+
+		assertThat(layout1.nodeModulesDir()).isNotEqualTo(layout2.nodeModulesDir());
+	}
+
+	static String prettierPackageJson(Map<String, String> dependencies) {
+		String templateContent = NpmResourceHelper.readUtf8StringFromClasspath(NodeServerLayoutTest.class, "/com/diffplug/spotless/npm/prettier-package.json");
+		String dependenciesList = dependencies.entrySet().stream()
+				.map(entry -> String.format("\"%s\": \"%s\"", entry.getKey(), entry.getValue()))
+				.reduce((a, b) -> a + ",\n  " + b)
+				.orElse("");
+
+		return templateContent.replace("${devDependencies}", dependenciesList);
+	}
+}