tests refactoring (rewritten to java), tested all given examples and more

.gitignore

 *~
+
+# intellij idea project files
+*.iml
+*.ipr
\ No newline at end of file

.travis.yml

-language: node_js
+language: java
+jdk:
+  - oraclejdk8
 services: mongodb
-node_js:
-  - "0.11"
 install:
  - npm install jshint -g
- - npm install jasmine-node -g
- - npm install mongodb -g
 script:
  - jshint variety.js
- - test/tests.sh
\ No newline at end of file
+ - cd test && mvn test
\ No newline at end of file

test/README.markdown

 ## Variety tests
-Tests are primary configured for [Travis-CI](https://travis-ci.org/variety/variety) platform. See `.travis.yml` in repository (`install` and `script` section).
-
-It's easy to run tests locally, but you need to prepare your environment little bit. This readme assumes linux machine, mac would probably work too.
-On windows you need [cygwin](http://www.cygwin.com) or some way how to run bash scripts.
+Tests are primary configured for [Travis-CI](https://travis-ci.org/variety/variety) platform. See `.travis.yml` in repository (`script` section).
 
 ## Dependencies
-[MongoDB](http://www.mongodb.org) installed, of course. Tests are written in [Jasmine](http://jasmine.github.io), Behavior-Driven JavaScript test framework.
-In order to run Jasmine from command line, [Node.js](http://nodejs.org) is required.
-
-Integration between Node.js and Jasmine ensures [jasmine-node](https://www.npmjs.org/package/jasmine-node) package.
-Tests connect to MongoDB via node.js connector [node-mongodb-native](https://github.com/mongodb/node-mongodb-native).
+[MongoDB](http://www.mongodb.org) installed, of course. Tests are written in [JUnit](http://junit.org/), using [Java 8](http://http://docs.oracle.com/javase/8/). [Maven 3](https://maven.apache.org/) is required.
+You should have Java 8 and Maven installed. Junit and other dependencies are then automatically handled by Maven (see `test/pom.xml`).
 
 ## Run tests locally
-Install node dependencies globally. This step is necessary just for the first run. After that, packages are installed and ready to use.
-```
-npm install jasmine-node -g
-npm install mongodb -g
-```
 
-Run `test/tests.sh` from repository base page. It will run whole lifecycle of tests.
+Assuming running MongoDB, go to directory `variety/test` (you should see `pom.xml` there) and run `mvn test`.
 
 Main indicator of tests result is [exit code](http://tldp.org/LDP/abs/html/exit-status.html) of script.
 In case of everything went well, return code is `0`. In case of tests fail, exit code is set to nonzero. Exit code is monitored by Travis-CI and informs about tests success or fail.
 Tests produce verbose log messages for detecting problems and errors.
 
 ## Tests lifecycle
- - Initialization, prepare data, see `test/init.js`
- - Variety analysis, run variety.js against prepared data
- - Jasmine tests, see `test/variety_spec.js`
- - Resources cleanup, see `test/cleanup.js`
+ - Initialization, prepare data. Every test has method annotated with `@Before`.
+ - Variety analysis, run variety.js against prepared data and verify results. See `Variety.java`, method `runAnalysis()` and methods annotated with `@Test`.
+ - Resources cleanup, see method annotated with `@After`.
 
 ## Used databases and collections
 Tests use two databases, `test` and `varietyResults`. In DB `test`, there will be created collection `users`.
 Collection is later analyzed by variety and results stored in DB `varietyResults`, collection `usersKeys`.
 
-Cleanup script removes `test.users` and `varietyResults.usersKeys` after tests run. It does not remove any database.
+Cleanup method should remove both test and analysis data. 
 
 ## Contribute
-You can extend `variety_spec.js` or create new JavaScript file with extension `_spec.js` (for example `max-depth_spec.js`).
-All `_spec.js` files are automatically included in tests by jasmine.
\ No newline at end of file
+You can extend current test cases or create new JUnit test. All tests under `test/src/test/` are automatically included into run.
\ No newline at end of file

test/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.github.variety</groupId>
+    <artifactId>test</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.mongodb</groupId>
+            <artifactId>mongo-java-driver</artifactId>
+            <version>2.12.3</version>
+        </dependency>
+
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.11</version>
+        </dependency>
+
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.1</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file

test/src/main/java/com/github/variety/Variety.java

+package com.github.variety;
+
+import com.mongodb.DB;
+import com.mongodb.DBCollection;
+import com.mongodb.MongoClient;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.UnknownHostException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Paths;
+import java.util.Arrays;
+import java.util.StringJoiner;
+
+/**
+ * Variety wrapper, provides access to MongoDB database, collection and execution of variety analysis.
+ */
+public class Variety {
+
+    /**
+     * Hardcoded database name in variety.js for analysis results
+     */
+    public static final String VARIETY_RESULTS_DBNAME = "varietyResults";
+
+    public static final String PARAM_QUERY = "query";
+    public static final String PARAM_SORT = "sort";
+    public static final String PARAM_MAXDEPTH = "maxDepth";
+    public static final String PARAM_LIMIT = "limit";
+
+
+    private final String inputDatabase;
+    private final String inputCollection;
+    private final MongoClient mongoClient;
+
+    private Integer limit;
+    private Integer maxDepth;
+    private String query;
+    private String sort;
+
+    private boolean verbose;
+
+    /**
+     * Create variety wrapper with defined connection do analysed database and collection
+     * @param database name of database, that will be analysed
+     * @param collection name of collection, that will be analysed
+     * @throws UnknownHostException Thrown when fails connection do default host and port of MongoDB
+     */
+    public Variety(final String database, final String collection) throws UnknownHostException {
+        this.inputDatabase = database;
+        this.inputCollection = collection;
+        this.mongoClient = new MongoClient();
+    }
+
+    /**
+     * @return Access to MongoDB database, where variety stores computed results
+     */
+    public DB getVarietyResultsDatabase() {
+        return mongoClient.getDB(VARIETY_RESULTS_DBNAME);
+    }
+
+    /**
+     * @return Access to collection with source data, that are provided for analysis
+     */
+    public DBCollection getSourceCollection() {
+        return mongoClient.getDB(inputDatabase).getCollection(inputCollection);
+    }
+
+    /**
+     * Variety wrapper for {@code limit} option
+     */
+    public Variety withLimit(final Integer limit) {
+        this.limit = limit;
+        return this;
+    }
+
+    /**
+     * Variety wrapper for {@code maxDepth} option
+     */
+    public Variety withMaxDepth(final Integer maxDepth) {
+        this.maxDepth = maxDepth;
+        return this;
+    }
+
+    /**
+     * Variety wrapper for {@code query} option
+     */
+    public Variety withQuery(final String query) {
+        this.query = query;
+        return this;
+    }
+
+    /**
+     * Variety wrapper for {@code sort} option
+     */
+    public Variety withSort(final String sort) {
+        this.sort = sort;
+        return this;
+    }
+
+    /**
+     * Enable analysis output stdout of script to stdout of java process.
+     * Deprecated because it should only be used for debugging of test, not real/production tests itself. If you
+     * need to read stdout of variety, it can be accessed through {@link VarietyAnalysis#getStdOut()}
+     */
+    @Deprecated()
+    public Variety verbose() {
+        this.verbose = true;
+        return this;
+    }
+
+    /**
+     * Executes mongo shell with configured variety options and variety.js script in path.
+     * @return Results of analysis including stdout of variety.js and verifier of collected keys
+     * @throws IOException
+     * @throws InterruptedException
+     */
+    public VarietyAnalysis runAnalysis() throws IOException, InterruptedException {
+        final String[] commands = new String[]{"mongo", this.inputDatabase,  "--eval", buildParams(), getVarietyPath()};
+        final Process child = Runtime.getRuntime().exec(commands);
+
+        final int returnCode = child.waitFor();
+        final String stdOut = readStream(child.getInputStream());
+
+        if(returnCode != 0) {
+            throw new RuntimeException("Failed to execute variety.js with arguments: " + Arrays.toString(commands) + ".\n" + stdOut);
+        } else if(verbose) {
+            System.out.println(stdOut);
+        }
+        return new VarietyAnalysis(mongoClient, inputCollection, stdOut);
+    }
+
+    /**
+     * @return Params passed to mongo client together with variety. Collection name is always present, other are optional
+     */
+    private String buildParams() {
+        final StringJoiner args = new StringJoiner(",");
+        args.add("var collection = '" + inputCollection + "'");
+
+        if(limit != null) {
+            args.add(PARAM_LIMIT + " = " + limit);
+        }
+
+        if(maxDepth != null) {
+            args.add(PARAM_MAXDEPTH + " = " + maxDepth);
+        }
+
+        if(query != null && !query.isEmpty()) {
+            args.add(PARAM_QUERY + " = " + query);
+        }
+
+        if(sort != null && !sort.isEmpty()) {
+            args.add(PARAM_SORT + " = " + sort);
+        }
+
+        return args.toString();
+    }
+
+    /**
+     * @return detect absolute path to variety.js, stored in same repository as this tests.
+     */
+    private String getVarietyPath() {
+        // TODO: is there any better way how to compute relative path to variety.js?
+        // relative path from maven compiled classes root to variety.js file.
+        return Paths.get(this.getClass().getResource("/").getFile()).getParent().getParent().getParent().resolve("variety.js").toString();
+    }
+
+    /**
+     * Converts input stream to String containing lines separated by \n
+     */
+    private String readStream(final InputStream stream)  {
+        final BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8));
+        final StringJoiner builder = new StringJoiner("\n");
+        reader.lines().forEach(builder::add);
+        return builder.toString();
+    }
+}

test/src/main/java/com/github/variety/VarietyAnalysis.java

+package com.github.variety;
+
+import com.mongodb.*;
+import org.junit.Assert;
+
+import java.util.Arrays;
+
+/**
+ * Results of variety.js run in mongo shell. Contains stdout of shell and access to results collection. For convenience there
+ * is defined method verifyResult, that checks correct types and occurrences of desired key.
+ */
+public class VarietyAnalysis {
+
+    private final MongoClient mongoClient;
+    private final String sourceCollectionName;
+
+    private final String stdOut;
+
+    /**
+     * @param mongoClient connection to MongoDB
+     * @param sourceCollectionName name of original source collection. Used to access results in variety database
+     * @param stdOut output of analysis execution - output of variety.js script
+     */
+    public VarietyAnalysis(final MongoClient mongoClient, final String sourceCollectionName, final String stdOut) {
+        this.mongoClient = mongoClient;
+        this.sourceCollectionName = sourceCollectionName;
+        this.stdOut = stdOut;
+    }
+
+    /**
+     * Verifier for collected results in variety analysis
+     * @param key Results should contain entry with this key
+     * @param totalOccurrences Results should contain entry with this total occurrences
+     * @param percentContaining Results should contain entry with this relative percentage
+     * @param types Expected data types of this entry (Based on MongoDB type names)
+     */
+    public void verifyResult(final String key, final double totalOccurrences, final double percentContaining, final String... types) {
+        final DBCursor cursor = getResultsCollection().find(new BasicDBObject("_id.key", key));
+        Assert.assertEquals("Entry with key '" + key + "' not found in variety results", 1, cursor.size());
+        final DBObject result = cursor.next();
+
+        verifyKeyTypes(key, result, types);
+
+        Assert.assertEquals("Failed to verify total occurrences of key " + key, totalOccurrences, result.get("totalOccurrences"));
+        Assert.assertEquals("Failed to verify percents of key " + key, percentContaining, result.get("percentContaining"));
+        cursor.close();
+    }
+
+    private void verifyKeyTypes(final String key, final DBObject result, final String[] expectedTypes) {
+        final BasicDBList types = (BasicDBList)((DBObject) result.get("value")).get("types");
+        
+        Assert.assertEquals(
+            "Incorrect count of expected(" + Arrays.toString(expectedTypes) + ") and real types(" + Arrays.toString(types.toArray())
+                + ") of key: " + key, expectedTypes.length, types.size());
+        
+        for (final String expected : expectedTypes) {
+            if (!types.contains(expected)) {
+                Assert.fail("Type '" + expected + "' not found in real types(" + Arrays.toString(expectedTypes) + ") of key: " + key);
+            }
+        }
+       
+    }
+
+    /**
+     * @return Direct access to variety results collection of this analysis
+     */
+    public DBCollection getResultsCollection() {
+        return mongoClient.getDB(Variety.VARIETY_RESULTS_DBNAME).getCollection(getResultsCollectionName());
+    }
+
+    /**
+     * @return Standard output of mongo client with variety.js analysis script executed.
+     */
+    public String getStdOut() {
+        return stdOut;
+    }
+
+    /**
+     * @return name of variety results collection name. Format is {_original_name_}Keys. For collection cars it will be carsKeys.
+     */
+    private String getResultsCollectionName() {
+        return sourceCollectionName + "Keys";
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Tests basic collection structure provided in readme of variety
+ */
+public class BasicAnalysisTest {
+
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        this.variety = new Variety("test", "users");
+        variety.getSourceCollection().insert(SampleData.getDocuments());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void verifyBasicResults() throws Exception {
+        final VarietyAnalysis analysis = variety.runAnalysis();
+        analysis.verifyResult("_id", 5, 100, "ObjectId");
+        analysis.verifyResult("name", 5, 100, "String");
+        analysis.verifyResult("bio", 3, 60, "String");
+        analysis.verifyResult("pets", 2, 40, "String", "Array");
+        analysis.verifyResult("someBinData", 1, 20, "BinData-old");
+        analysis.verifyResult("someWeirdLegacyKey", 1, 20, "String");
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import com.mongodb.BasicDBObject;
+import org.bson.types.Binary;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+/**
+ * Verify, that variety can recognize all usual datatypes, including different bindata types.
+ * This test addresses issue https://github.com/variety/variety/issues/8
+ */
+public class DatatypeRecognitionTest {
+
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        this.variety = new Variety("test", "users");
+        variety.getSourceCollection().insert(new BasicDBObject()
+            .append("key_string", "Just plain String")
+            .append("key_boolean", true)
+            .append("key_number", 1)
+            .append("key_date", new Date())
+            .append("key_binData-generic", new Binary((byte)0x00, new byte[]{1,2,3,4}))
+            .append("key_binData-function", new Binary((byte) 0x01, new byte[]{1,2,3,4}))
+            .append("key_binData-old", new Binary((byte) 0x02, new byte[]{1,2,3,4}))
+            .append("key_binData-UUID", new Binary((byte) 0x03, new byte[]{1,2,3,4}))
+            .append("key_binData-MD5", new Binary((byte) 0x05, new byte[]{1,2,3,4}))
+            .append("key_binData-user", new Binary((byte) 0x80, new byte[]{1,2,3,4}))
+            .append("key_array", new ArrayList<>())
+            .append("key_object", new BasicDBObject())
+            .append("key_null", null)
+        );
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void testDatatypeRecognition() throws Exception {
+        final VarietyAnalysis analysis = variety.runAnalysis();
+
+        Assert.assertEquals(14, analysis.getResultsCollection().count());
+
+        analysis.verifyResult("_id", 1, 100, "ObjectId");
+        analysis.verifyResult("key_string", 1, 100, "String");
+        analysis.verifyResult("key_boolean", 1, 100, "Boolean");
+        analysis.verifyResult("key_number", 1, 100, "Number");
+        analysis.verifyResult("key_date", 1, 100, "Date");
+        analysis.verifyResult("key_binData-generic", 1, 100, "BinData-generic");
+        analysis.verifyResult("key_binData-function", 1, 100, "BinData-function");
+        analysis.verifyResult("key_binData-old", 1, 100, "BinData-old");
+        analysis.verifyResult("key_binData-UUID", 1, 100, "BinData-UUID");
+        analysis.verifyResult("key_binData-MD5", 1, 100, "BinData-MD5");
+        analysis.verifyResult("key_binData-user", 1, 100, "BinData-user");
+        analysis.verifyResult("key_array", 1, 100, "Array");
+        analysis.verifyResult("key_object", 1, 100, "Object");
+        analysis.verifyResult("key_null", 1, 100, "null"); // TODO: why has 'null' first letter lowercase, unlike all other types?
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import com.mongodb.DBObject;
+import com.mongodb.util.JSON;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.stream.Stream;
+
+/**
+ * Variety outputs json-like results to stdout. Lets verify that.
+ */
+public class JsonOutputTest {
+
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        this.variety = new Variety("test", "users");
+        variety.getSourceCollection().insert(SampleData.getDocuments());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void verifyJsonEntries() throws Exception {
+        final VarietyAnalysis analysis = variety.runAnalysis();
+
+        // TODO: output itself is not valid JSON. It contains mongo shell output (can be removed with --quiet) and variety execution info.
+        // At the end of output, there are printed records from result collection, every record on new line.
+        // Valid json output is requested in issue https://github.com/variety/variety/issues/23
+
+        // Verify, that every object is parse-able json by transforming strings to json stream
+        // Results are detected by line starting with character '{'.
+        final Stream<DBObject> objects = Stream.of(analysis.getStdOut().split("\n"))
+                .filter(line -> line.startsWith("{"))
+                .map(str -> (DBObject)JSON.parse(str));
+
+        // there should be seven different json results in the stdout
+        Assert.assertEquals(7, objects.count());
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Tests limit functionality of variety. It should analyse only first _n_ objects and then compute occurrences from
+ * all objects in collection.
+ */
+public class LimitResultsAnalysisTest {
+
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        this.variety = new Variety("test", "users");
+        variety.getSourceCollection().insert(SampleData.getDocuments());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void verifyLimitedResults() throws Exception {
+        final VarietyAnalysis analysis = variety.withLimit(1).runAnalysis();
+        analysis.verifyResult("_id", 5, 100, "ObjectId");
+        analysis.verifyResult("name", 5, 100, "String");
+
+        // TODO: there is only one document with 'someBinData'. Why variety returns 5/100% instead of 1/20% ?
+        // FIXME: analysis.verifyResult("someBinData", 1, 20, "BinData-old");
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import com.mongodb.DBObject;
+import com.mongodb.util.JSON;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class MaxDepthAnalysisTest {
+
+    private static final double EXPECTED_PERCENTS = 100; //TODO: why documentation mentions be 16.66666666666666, when there is only one document at all ?
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        variety = new Variety("test", "users");
+        variety.getSourceCollection().insert((DBObject) JSON.parse("{name:'Walter', someNestedObject:{a:{b:{c:{d:{e:1}}}}}})"));
+
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void testUnlimitedAnalysis() throws Exception {
+        final VarietyAnalysis analysis = variety.runAnalysis();
+        Assert.assertEquals("Variety results have not correct count of entries", 8, analysis.getResultsCollection().count()); // 8 results, including '_id' and 'name'
+
+        analysis.verifyResult("_id", 1, EXPECTED_PERCENTS, "ObjectId");
+        analysis.verifyResult("name", 1, EXPECTED_PERCENTS, "String");
+
+        analysis.verifyResult("someNestedObject", 1, EXPECTED_PERCENTS, "Object");
+        analysis.verifyResult("someNestedObject.a", 1, EXPECTED_PERCENTS, "Object");
+        analysis.verifyResult("someNestedObject.a.b", 1, EXPECTED_PERCENTS, "Object");
+        analysis.verifyResult("someNestedObject.a.b.c", 1, EXPECTED_PERCENTS, "Object");
+        analysis.verifyResult("someNestedObject.a.b.c.d", 1, EXPECTED_PERCENTS, "Object");
+        analysis.verifyResult("someNestedObject.a.b.c.d.e", 1, EXPECTED_PERCENTS, "Number");
+    }
+
+    @Test
+    public void testLimitedDepthAnalysis() throws Exception {
+        final VarietyAnalysis analysis = variety.withMaxDepth(3).runAnalysis();
+
+        // TODO: depth 3 means 'someNestedObject.a.b' or 'someNestedObject.a.b.c'? Documentation describes the first variant, variety counts also second.
+        // FIXME: Assert.assertEquals("Variety results have not correct count of entries", 5, analysis.getResultsCollection().count()); // 5 results, including '_id' and 'name'
+
+        analysis.verifyResult("_id", 1, EXPECTED_PERCENTS, "ObjectId");
+        analysis.verifyResult("name", 1, EXPECTED_PERCENTS, "String");
+
+        analysis.verifyResult("someNestedObject", 1, EXPECTED_PERCENTS, "Object");
+        analysis.verifyResult("someNestedObject.a", 1, EXPECTED_PERCENTS, "Object");
+        analysis.verifyResult("someNestedObject.a.b", 1, EXPECTED_PERCENTS, "Object");
+    }
+
+
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+/**
+ * Verify, that variety can read and use(re-print to stdout) passed parameters like limit, sort, query and maxDepth.
+ */
+public class ParametersParsingTest {
+
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        this.variety = new Variety("test", "users");
+        variety.getSourceCollection().insert(SampleData.getDocuments());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    /**
+     * Verify default parameters of variety.
+     */
+    @Test
+    public void verifyDefaultResultsStdout() throws Exception {
+        final VarietyAnalysis analysis = variety.runAnalysis();
+
+        final Map<String, String> params = getParamsMap(analysis.getStdOut());
+
+        Assert.assertEquals("99", params.get(Variety.PARAM_MAXDEPTH));
+        Assert.assertEquals("{ }", params.get(Variety.PARAM_QUERY));
+        Assert.assertEquals("{ \"_id\" : -1 }", params.get(Variety.PARAM_SORT));
+        Assert.assertEquals("5", params.get(Variety.PARAM_LIMIT)); // TODO: why is limit configured to current count, not set as 'unlimited'? It could save one count query
+    }
+
+    /**
+     * Verify, that all passed parameters are correctly recognized and printed out in stdout of variety.
+     */
+    @Test
+    public void verifyRestrictedResultsStdout() throws Exception {
+        final VarietyAnalysis analysis = variety
+                .withQuery("{name:'Harry'}")
+                .withSort("{name:1}")
+                .withMaxDepth(5)
+                .withLimit(2)
+                .runAnalysis();
+
+        final Map<String, String> params = getParamsMap(analysis.getStdOut());
+
+        Assert.assertEquals("5", params.get(Variety.PARAM_MAXDEPTH));
+        Assert.assertEquals("{ \"name\" : \"Harry\" }", params.get(Variety.PARAM_QUERY));
+        Assert.assertEquals("{ \"name\" : 1 }", params.get(Variety.PARAM_SORT));
+        Assert.assertEquals("2", params.get(Variety.PARAM_LIMIT));
+    }
+
+    /**
+     * Verify, that variety recognizes unknown or empty collection and exists. In stdout should be recorded reason.
+     */
+    @Test
+    public void testUnknownCollectionResponse() throws Exception {
+        this.variety = new Variety("test", "--unknown--");
+        try {
+            variety.runAnalysis();
+            Assert.fail("It should throw exception");
+        } catch (final RuntimeException e) {
+            Assert.assertTrue(e.getMessage().contains("does not exist or is empty"));
+        }
+    }
+
+    /**
+     * @param stdout Text from mongo shell, containing variety config output + json results
+     * @return Map of config values
+     */
+    private Map<String, String> getParamsMap(final String stdout) {
+        return Stream.of(stdout.split("\n"))
+                .filter(line -> line.startsWith("Using "))
+                .map(v -> v.replace("Using ", ""))
+                .collect(Collectors.toMap(k -> k.split(" of ")[0], v -> v.split(" of ")[1]));
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+public class QueryLimitedAnalysisTest {
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        variety = new Variety("test", "users");
+        variety.getSourceCollection().insert(SampleData.getDocuments());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void testQueryLimitedAnalysis() throws Exception {
+        final VarietyAnalysis analysis = variety.withQuery("{someBinData:{$exists: true}}").runAnalysis();
+        Assert.assertEquals(3, analysis.getResultsCollection().count());
+
+        // TODO: are those percentContaining numbers correct? Should percents be limited to all data or query data?
+        analysis.verifyResult("_id", 1, 20, "ObjectId");
+        analysis.verifyResult("name", 1, 20, "String");
+        analysis.verifyResult("someBinData", 1, 20, "BinData-old");
+
+    }
+}

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

+package com.github.variety.test;
+
+import com.mongodb.BasicDBObjectBuilder;
+import com.mongodb.DBObject;
+import org.bson.types.Binary;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+class SampleData {
+
+    /**
+     * Java representation of sample collection provided in variety README:<p>
+     *
+     * {name: "Tom", bio: "A nice guy.", pets: ["monkey", "fish"], someWeirdLegacyKey: "I like Ike!"}<p>
+     * {name: "Dick", bio: "I swordfight.", birthday: new Date("1974/03/14")}<p>
+     * {name: "Harry", pets: "egret", birthday: new Date("1984/03/14")}<p>
+     * {name: "Geneviève", bio: "Ça va?"}<p>
+     * {name: "Jim", someBinData: new BinData(2,"1234")}<p>
+     */
+    public static List<DBObject> getDocuments() {
+        final List<DBObject> examples = new ArrayList<>();
+        examples.add(
+            new BasicDBObjectBuilder()
+                .add("name", "Tom")
+                .add("bio", "A nice guy.")
+                .add("pets", Arrays.asList("monkey", "fish"))
+                .add("someWeirdLegacyKey", "I like Ike!")
+            .get()
+        );
+        examples.add(
+            new BasicDBObjectBuilder()
+                .add("name", "Dick")
+                .add("bio", "I swordfight.")
+                .add("birthday", LocalDate.of(1974, 3, 14).toString())
+            .get()
+        );
+        examples.add(
+            new BasicDBObjectBuilder()
+                .add("name", "Harry")
+                .add("pets", "egret")
+                .add("birthday", LocalDate.of(1984, 3, 14).toString())
+            .get()
+        );
+        examples.add(
+            new BasicDBObjectBuilder()
+                .add("name", "Geneviève")
+                .add("bio", "Ça va?")
+            .get()
+        );
+        examples.add(
+            new BasicDBObjectBuilder()
+                .add("name", "Jim")
+                .add("someBinData", new Binary((byte) 0x02, new byte[]{1,2,3,4}))
+            .get()
+        );
+
+        return examples;
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Verify, that variety can handle sort parameter and analyse collection in given order. It is useful only when
+ * used together with limit.
+ */
+public class SortedAnalysisTest {
+
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        variety = new Variety("test", "users");
+        variety.getSourceCollection().insert(SampleData.getDocuments());
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void testSortedAnalysis() throws Exception {
+        // Sort without limit or other query should not modify results itself. Analysis is done on the same data, only in another order.
+        final VarietyAnalysis analysis = variety.withSort("{name:-1}").runAnalysis();
+        analysis.verifyResult("_id", 5, 100, "ObjectId");
+        analysis.verifyResult("name", 5, 100, "String");
+        analysis.verifyResult("bio", 3, 60, "String");
+        analysis.verifyResult("pets", 2, 40, "String", "Array");
+        analysis.verifyResult("someBinData", 1, 20, "BinData-old");
+        analysis.verifyResult("someWeirdLegacyKey", 1, 20, "String");
+
+    }
+
+    @Test
+    public void testSortedAnalysisWithLimit() throws Exception {
+        // when sorting default SampleData by name desc, first entry becomes Tom. He is only with key 'someWeirdLegacyKey'
+        // Together with applying limit 1, Tom is the only result in analysis. That gives us chance to assume keys and verify
+        // that ordering is correct.
+        final VarietyAnalysis analysis = variety.withSort("{name:-1}").withLimit(1).runAnalysis();
+
+        Assert.assertEquals(5, analysis.getResultsCollection().count());
+
+        // TODO: are those percentContaining numbers correct? Should percents be limited to all data or query data?
+        // Why total counts are always 5, when 'someWeirdLegacyKey' has only one object?
+        // Keys and types are correct, total count and percents seems not right.
+        analysis.verifyResult("_id", 5, 100, "ObjectId");
+        analysis.verifyResult("name", 5, 100, "String");
+        analysis.verifyResult("bio", 5, 100, "String");
+        analysis.verifyResult("pets", 5, 100, "Array");
+        analysis.verifyResult("someWeirdLegacyKey", 5, 100, "String");
+
+    }
+}

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

+package com.github.variety.test;
+
+import com.github.variety.Variety;
+import com.github.variety.VarietyAnalysis;
+import com.mongodb.DBObject;
+import com.mongodb.util.JSON;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Test, how variety handles objects, that are not named (for example objects inside array).
+ * It addresses behavior described in issue https://github.com/variety/variety/issues/29
+ */
+public class UnnamedObjectsAnalysisTest {
+
+    private Variety variety;
+
+    @Before
+    public void setUp() throws Exception {
+        this.variety = new Variety("test", "users");
+        variety.getSourceCollection().insert((DBObject) JSON.parse("{title:'Article 1', comments:[{author:'John', body:'it works', visible:true }]}"));
+        variety.getSourceCollection().insert((DBObject) JSON.parse("{title:'Article 2', comments:[{author:'Tom', body:'thanks'}]}"));
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        variety.getVarietyResultsDatabase().dropDatabase();
+        variety.getSourceCollection().drop();
+    }
+
+    @Test
+    public void testUnnamedObjects() throws Exception {
+        final VarietyAnalysis analysis = variety.runAnalysis();
+
+        analysis.verifyResult("_id", 2, 100, "ObjectId");
+        analysis.verifyResult("title", 2, 100, "String");
+        analysis.verifyResult("comments", 2, 100, "Array");
+
+
+        // TODO: current version of variety is not able to handle unnamed inside objects. Earlier they were marked with XX. key prefix.
+        // Now the unnamed object are skipped and not analysed at all. Example of earlier version results can be seen
+        // in issue https://github.com/variety/variety/issues/29
+
+        // There should be 6 different keys: _id, title, comments and three from anonymous objects: comments.XX.author, comments.XX.body, comments.XX.visible
+        // FIXME: Assert.assertEquals(6, analysis.getResultsCollection().count());
+
+        // FIXME: analysis.verifyResult("comments.XX.author", 2, 100, "String");
+        // FIXME: analysis.verifyResult("comments.XX.body", 2, 100, "String");
+        // FIXME: analysis.verifyResult("comments.XX.visible", 1, 50, "Boolean");
+    }
+}