test: VariationDiff::computeAllFeatureNames()

Author: pmbittner

src/test/java/FeatureNamesTest.java

@@ -0,0 +1,56 @@
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.LinkedHashSet;
+import java.util.List;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.variantsync.diffdetective.diff.result.DiffParseException;
+import org.variantsync.diffdetective.variation.DiffLinesLabel;
+import org.variantsync.diffdetective.variation.Label;
+import org.variantsync.diffdetective.variation.diff.VariationDiff;
+import org.variantsync.diffdetective.variation.diff.parse.VariationDiffParseOptions;
+
+/**
+ * Test for {@link VariationDiff#computeAllFeatureNames()}.
+ */
+public class FeatureNamesTest {
+    private final static Path
+        diffsDir    = Constants.RESOURCE_DIR.resolve("diffs"),
+        pctestDir   = Constants.RESOURCE_DIR.resolve("pctest"),
+        ourDir      = Constants.RESOURCE_DIR.resolve("featurenames"),
+        collapseDir = diffsDir.resolve("collapse"),
+        moveDir     = diffsDir.resolve("move");
+
+    public record TestCase<L extends Label>(String origin, VariationDiff<L> diff, LinkedHashSet<String> features) {
+        public static TestCase<DiffLinesLabel> fromFile(Path p, String... features) throws IOException, DiffParseException {
+            return new TestCase<>(
+                p.toString(),
+                VariationDiff.fromFile(p, VariationDiffParseOptions.Default),
+                new LinkedHashSet<String>(List.of(features))
+            );
+        }
+    };
+
+    private static List<TestCase<DiffLinesLabel>> diffFeatureNameTestCases() throws IOException, DiffParseException {
+        return List.of(
+            TestCase.fromFile(collapseDir.resolve("elif.txt"), "A", "B", "C", "D", "E"),
+            TestCase.fromFile(collapseDir.resolve("simple.txt"), "A", "B", "C"),
+            TestCase.fromFile(moveDir.resolve("simple.txt"), "X", "Y"),
+            TestCase.fromFile(pctestDir.resolve("a.diff"), "A", "D", "E", "B", "C"),
+            TestCase.fromFile(pctestDir.resolve("elif.diff"), "A", "B", "C", "D"),
+            TestCase.fromFile(pctestDir.resolve("else.diff"), "A", "C", "B"),
+            TestCase.fromFile(ourDir.resolve("empty.diff")),
+            TestCase.fromFile(ourDir.resolve("a.diff"), "FIRST", "SECOND"),
+            TestCase.fromFile(ourDir.resolve("b.diff"), "A")
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("diffFeatureNameTestCases")
+    public void testComputeAllFeatureNames(TestCase<DiffLinesLabel> testCase) {
+        assertEquals(testCase.features(), testCase.diff().computeAllFeatureNames(), testCase.origin());
+    }
+}

src/test/resources/featurenames/a.diff

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+ #if FIRST
+   foo
+ #if SECOND
+   bar
+ #endif
+ #endif

src/test/resources/featurenames/b.diff

@@ -0,0 +1,6 @@
+-#if A
+   foo
+ #if A
+   bar
+ #endif
+-#endif

src/test/resources/featurenames/empty.diff

@@ -0,0 +1 @@
+ foo