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java/wordStat/WordStatTest.java

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+package wordStat;
+
+import base.Named;
+import base.Selector;
+
+import java.util.Comparator;
+import java.util.function.Function;
+import java.util.stream.Stream;
+
+/**
+ * Tests for <a href="https://www.kgeorgiy.info/courses/prog-intro/homeworks.html#wordstat">Word Statistics</a> homework
+ * of <a href="https://www.kgeorgiy.info/courses/prog-intro/">Introduction to Programming</a> course.
+ *
+ * @author Georgiy Korneev (kgeorgiy@kgeorgiy.info)
+ */
+public final class WordStatTest {
+    // === Base
+    private static final Named<Function<String, Stream<String>>> ID  = Named.of("", Stream::of);
+    private static final WordStatTester.Variant BASE = new WordStatTester.Variant("", false, Comparator.comparingInt(p -> 0));
+
+
+    // === 3637
+    public static final int SIZE = 3;
+    private static final WordStatTester.Variant LENGTH = new WordStatTester.Variant("Length", false, Comparator.comparingInt(p -> p.first().length()));
+    private static final Named<Function<String, Stream<String>>> MIDDLE =
+            size("Middle", SIZE * 2 + 1, s -> Stream.of(s.substring(SIZE, s.length() - SIZE)));
+
+    static Named<Function<String, Stream<String>>> size(
+            final String name,
+            final int length,
+            final Function<String, Stream<String>> f
+    ) {
+        return Named.of(name, s -> s.length() >= length ? f.apply(s) : Stream.empty());
+    }
+
+    // === 3839
+    private static final Named<Function<String, Stream<String>>> AFFIX = size(
+            "Affix",
+            2,
+            s -> Stream.of(s.substring(0, s.length() / 2), s.substring(s.length() - s.length() / 2))
+    );
+
+    // === 3536
+    private static final Named<Function<String, Stream<String>>> SUFFIX =
+            size("Suffix", 2, s -> Stream.of(s.substring(s.length() - s.length() / 2)));
+
+    // === 4749
+    private static final Named<Function<String, Stream<String>>> PREFIX =
+            size("Prefix", 2, s -> Stream.of(s.substring(0, s.length() / 2)));
+
+    // === Common
+    public static final Selector SELECTOR = new Selector(WordStatTester.class)
+            .variant("Base", BASE.with(ID))
+            .variant("3637", LENGTH.with(MIDDLE))
+            .variant("3839", LENGTH.with(AFFIX))
+            .variant("3435", LENGTH.with(SUFFIX))
+            .variant("3233", LENGTH.with(ID))
+            .variant("4142", LENGTH.with(MIDDLE))
+            .variant("4749", LENGTH.with(PREFIX))
+
+            ;
+
+    private WordStatTest() {
+        // Utility class
+    }
+
+    public static void main(final String... args) {
+        SELECTOR.main(args);
+    }
+}