Add black box tests for queryBridgeWords.

app/build.gradle.kts

@@ -34,6 +34,8 @@ dependencies {
   implementation(libs.guava)
 
   implementation("org.jline:jline:3.29.0")
+
+  compileOnly("com.github.spotbugs:spotbugs-annotations:3.1.3")
 }
 
 // Apply a specific Java toolchain to ease working on different environments.

app/src/main/java/fun/youthlic/GraphCLI.java

@@ -1,6 +1,5 @@
 package fun.youthlic;
 
-import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.FileReader;
@@ -26,7 +25,6 @@ import org.jline.terminal.TerminalBuilder;
  */
 @SuppressWarnings("ALL")
 public class GraphCLI {
-  @SuppressFBWarnings({"DM_DEFAULT_ENCODING", "PATH_TRAVERSAL_IN"})
   static String readFile(final String filename) {
     String text = null;
     try (BufferedReader inputReader = new BufferedReader(new FileReader(filename))) {
@@ -255,7 +253,6 @@ class GraphCLIHelper {
     return output.toString();
   }
 
-  @SuppressFBWarnings({"PREDICTABLE_RANDOM", "DMI_RANDOM_USED_ONLY_ONCE"})
   String generateNewText(final String inputText) {
     final var output = new StringBuilder();
     final var words = inputText.split("\\s+");
@@ -332,7 +329,6 @@ class GraphCLIHelper {
     return graph.computePageRank(word);
   }
 
-  @SuppressFBWarnings("DM_DEFAULT_ENCODING")
   String randomWalk() {
     final var text = String.join(" ", graph.randomWalk());
     final Path path = Paths.get("output.txt");

app/src/test/java/fun/youthlic/GraphCLIHelperTest.java

@@ -0,0 +1,80 @@
+package fun.youthlic;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class GraphCLIHelperTest {
+  private final GraphCLIHelper graph = new GraphCLIHelper("B D E H A C D H A F D H A B G H A C G H A D G H");
+
+  @Test
+  void testWord1NotInGraph() {
+    var result = graph.queryBridgeWords("x", "a");
+    assertEquals("No x or a in the graph!", result);
+  }
+  @Test
+  void testWord2NotInGraph() {
+    String result = graph.queryBridgeWords("a", "x");
+    assertEquals("No a or x in the graph!", result);
+  }
+
+  @Test
+  void testBothWordsNotInGraph() {
+    String result = graph.queryBridgeWords("x", "y");
+    assertEquals("No x or y in the graph!", result);
+  }
+
+  @Test
+  void testNoBridgeWords() {
+    String result = graph.queryBridgeWords("a", "b");
+    assertEquals("No bridge words from a to b!", result);
+  }
+
+  @Test
+  void testSingleBridgeWord() {
+    String result = graph.queryBridgeWords("b", "e");
+    assertEquals("The bridge words from b to e are: d.", result);
+  }
+
+  @Test
+  void testTwoBridgeWords() {
+    String result = graph.queryBridgeWords("c", "h");
+    assertEquals("The bridge words from c to h are: g, and d.", result);
+  }
+
+  @Test
+  void testThreeBridgeWords() {
+    String result = graph.queryBridgeWords("a", "g");
+    assertEquals("The bridge words from a to g are: c, b, and d.", result);
+  }
+
+  @Test
+  void testSameWordInput() {
+    String result = graph.queryBridgeWords("a", "a");
+    assertEquals("No bridge words from a to a!", result);
+  }
+
+  @Test
+  void testWord1Empty() {
+    String result = graph.queryBridgeWords("", "a");
+    assertEquals("No  or a in the graph!", result);
+  }
+
+  @Test
+  void testWord2Empty() {
+    String result = graph.queryBridgeWords("a", "");
+    assertEquals("No a or  in the graph!", result);
+  }
+
+  @Test
+  void testBothWordsEmpty() {
+    String result = graph.queryBridgeWords("", "");
+    assertEquals("No  or  in the graph!", result);
+  }
+
+  @Test
+  void testCaseMismatch() {
+    String result = graph.queryBridgeWords("B", "E");
+    assertEquals("The bridge words from B to E are: d.", result);
+  }
+}