Version info test (equality of CHANGELOG and variety.js)

test/src/test/java/com/github/variety/test/VersionInfoTest.java

+package com.github.variety.test;
+
+import junit.framework.AssertionFailedError;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Compare, that variety version info is identical in variety.js and in CHANGELOG files.
+ */
+public class VersionInfoTest {
+
+    public static final Pattern VARIETYJS_PATTERN = Pattern.compile("print\\('(.+), released (.+)'\\).*");
+    public static final Pattern CHANGELOG_PATTERN = Pattern.compile("\\((.+)\\)(.+):(.*)");
+    
+    private List<String> varietyLines;
+    private List<String> changelogLines;
+
+    @Before
+    public void setUp() throws Exception {
+        varietyLines = Files.readAllLines(getFile("variety.js"));
+        changelogLines = Files.readAllLines(getFile("CHANGELOG"));
+    }
+
+    @Test
+    public void testVersionsEquality() throws Exception {
+        Assert.assertEquals("Version provided in variety.js is different from given in CHANGELOG",
+                getChangelogVersion(changelogLines), getVarietyVersion(varietyLines));
+    }
+
+    @Test
+    public void testDatesEquality() throws Exception {
+        Assert.assertEquals("Date provided in variety.js is different from given in CHANGELOG",
+                getChangelogDate(changelogLines), getVarietyDate(varietyLines));
+    }
+
+    private String getVarietyVersion(List<String> variety) {
+        return getVarietyPatternGroup(variety, 1);
+    }
+
+    private String getVarietyDate(List<String> variety) {
+        return getVarietyPatternGroup(variety, 2);
+    }
+
+    private String getChangelogDate(List<String> changelog) {
+        return getChangelogPatternGroup(changelog, 1);
+    }
+
+    private String getChangelogVersion(List<String> changelog) {
+        return getChangelogPatternGroup(changelog, 2);
+    }
+
+    private String getVarietyPatternGroup(final List<String> variety, final int group) {
+        for (String line : variety) {
+            final Matcher matcher = VARIETYJS_PATTERN.matcher(line);
+            if (matcher.matches()) {
+                return matcher.group(group);
+            }
+        }
+        throw new AssertionFailedError("Variety.js does not contain version and date info");
+    }
+
+    private String getChangelogPatternGroup(final List<String> changelog, final int group) {
+        final Matcher matcher = CHANGELOG_PATTERN.matcher(changelog.get(0));
+        if (!matcher.find()) {
+            throw new AssertionFailedError("CHANGELOG does not contain version and date info");
+        }
+        return matcher.group(group).trim();
+    }
+
+    private Path getFile(String filename) {
+        // on linux could it be for example /{path_to_project}/variety/test/target/test-classes
+        final String testClassesPath = this.getClass().getResource("/").getFile();
+
+        // traverse from test classes path to variety base directory
+        return Paths.get(testClassesPath).getParent().getParent().getParent().resolve(filename);
+    }
+}