diff --git a/src/modules/bing.js b/src/modules/bing.js
index f258a31..6a5f6bd 100644
--- a/src/modules/bing.js
+++ b/src/modules/bing.js
@@ -18,8 +18,9 @@ class BingScraper extends Scraper {
 			})
 		});
 
+		// 'Including results for', 'Einschließlich Ergebnisse'
 		let no_results = this.no_results(
-			['There are no results', 'Es gibt keine Ergebnisse', 'Including results for', 'Einschließlich Ergebnisse'],
+			['There are no results', 'Es gibt keine Ergebnisse'],
 			$('#b_results').text()
 		);
 
diff --git a/src/modules/duckduckgo.js b/src/modules/duckduckgo.js
index 7ce045c..b89bbd4 100644
--- a/src/modules/duckduckgo.js
+++ b/src/modules/duckduckgo.js
@@ -19,6 +19,8 @@ class DuckduckgoScraper extends Scraper {
             });
         });
 
+        let effective_query = $('#did_you_mean a.js-spelling-suggestion-link').attr('data-query') || '';
+
         const cleaned = [];
         for (var i=0; i < results.length; i++) {
             let res = results[i];
@@ -30,6 +32,7 @@ class DuckduckgoScraper extends Scraper {
 
         return {
             time: (new Date()).toUTCString(),
+            effective_query: effective_query,
             results: cleaned
         }
     }
diff --git a/test/test_bing.js b/test/test_bing.js
new file mode 100644
index 0000000..c8d6111
--- /dev/null
+++ b/test/test_bing.js
@@ -0,0 +1,201 @@
+const se_scraper =  require('./../index.js');
+var assert = require('chai').assert;
+
+/*
+ * Use chai and mocha for tests.
+ * https://mochajs.org/#installation
+ */
+
+const normal_search_keywords = ['apple tree', 'weather tomorrow'];
+
+async function normal_search_test() {
+    let config = {
+        search_engine: 'bing',
+        compress: false,
+        debug: false,
+        verbose: false,
+        keywords: normal_search_keywords,
+        keyword_file: '',
+        num_pages: 3,
+        headless: true,
+        output_file: '',
+        block_assets: true,
+        user_agent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36',
+        random_user_agent: false,
+    };
+
+    console.log('normal_search_test()');
+    await se_scraper.scrape(config, normal_search_test_case);
+}
+
+// we test with a callback function to our handler
+function normal_search_test_case(err, response) {
+
+    if (err) {
+        console.error(err);
+    } else {
+        assert.equal(response.headers['Content-Type'], 'text/json', 'content type is not text/json');
+        assert.equal(response.statusCode, 200, 'status code must be 200');
+
+        let total_rank = 1;
+
+        for (let query in response.results) {
+
+            assert.containsAllKeys(response.results, normal_search_keywords, 'not all keywords were scraped.');
+
+            for (let page_number in response.results[query]) {
+
+                assert.isNumber(parseInt(page_number), 'page_number must be numeric');
+
+                let obj = response.results[query][page_number];
+
+                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results', 'effective_query'], 'not all keys are in the object');
+
+                assert.isAtLeast(obj.results.length, 7, 'results must have at least 7 SERP objects');
+                assert.equal(obj.no_results, false, 'no results should be false');
+                assert.typeOf(obj.num_results, 'string', 'num_results must be a string');
+                assert.isAtLeast(obj.num_results.length, 5, 'num_results should be a string of at least 5 chars');
+                assert.typeOf(Date.parse(obj.time), 'number', 'time should be a valid date');
+
+                for (let res of obj.results) {
+
+                    assert.containsAllKeys(res, ['link', 'title', 'rank', 'visible_link', 'rank'], 'not all keys are in the SERP object');
+
+                    assert.isOk(res.link, 'link must be ok');
+                    assert.typeOf(res.link, 'string', 'link must be string');
+                    assert.isAtLeast(res.link.length, 5, 'link must have at least 5 chars');
+
+                    assert.isOk(res.visible_link, 'visible_link must be ok');
+                    assert.typeOf(res.visible_link, 'string', 'visible_link must be string');
+                    assert.isAtLeast(res.visible_link.length, 5, 'visible_link must have at least 5 chars');
+
+                    assert.isOk(res.title, 'title must be ok');
+                    assert.typeOf(res.title, 'string', 'title must be string');
+                    assert.isAtLeast(res.title.length, 5, 'title must have at least 5 chars');
+
+                    assert.isOk(res.snippet, 'snippet must be ok');
+                    assert.typeOf(res.snippet, 'string', 'snippet must be string');
+                    assert.isAtLeast(res.snippet.length, 10, 'snippet must have at least 10 chars');
+
+                    assert.isNumber(res.rank, 'rank must be integer');
+                    assert.equal(res.rank, total_rank++, 'rank ist wrong');
+                }
+            }
+        }
+    }
+}
+
+const keywords_no_results = ['fgskl34440abJAksafkl34a44dsflkjaQQuBBdfk',];
+
+async function no_results_test() {
+    let config = {
+        search_engine: 'bing',
+        compress: false,
+        debug: false,
+        verbose: false,
+        keywords: keywords_no_results,
+        keyword_file: '',
+        num_pages: 1,
+        headless: true,
+        output_file: '',
+        block_assets: true,
+        user_agent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36',
+        random_user_agent: false,
+    };
+    console.log('no_results_test()');
+    await se_scraper.scrape(config, test_case_no_results);
+}
+
+// we test with a callback function to our handler
+function test_case_no_results(err, response) {
+    if (err) {
+        console.error(err);
+    } else {
+        assert.equal(response.headers['Content-Type'], 'text/json', 'content type is not text/json');
+        assert.equal(response.statusCode, 200, 'status code must be 200');
+        results = response.results;
+        for (let query in response.results) {
+
+            assert.containsAllKeys(response.results, keywords_no_results, 'not all keywords were scraped.');
+
+            for (let page_number in response.results[query]) {
+
+                assert.isNumber(parseInt(page_number), 'page_number must be numeric');
+
+                let obj = response.results[query][page_number];
+
+                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results', 'effective_query'], 'not all keys are in the object');
+
+                assert(obj.results.length === 0, 'results must have 0 SERP objects');
+                assert.equal(obj.no_results, true, 'no results should be true');
+                assert.isEmpty(obj.num_results, 'no results should be a empty string');
+                assert.typeOf(Date.parse(obj.time), 'number', 'time should be a valid date');
+            }
+        }
+    }
+}
+
+const effective_query_keywords = ['mount everrest'];
+
+async function effective_query_test() {
+    let config = {
+        search_engine: 'bing',
+        compress: false,
+        debug: false,
+        verbose: false,
+        keywords: effective_query_keywords,
+        keyword_file: '',
+        num_pages: 1,
+        headless: true,
+        output_file: '',
+        block_assets: true,
+        user_agent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36',
+        random_user_agent: false,
+    };
+    console.log('effective_query_test()');
+    await se_scraper.scrape(config, test_case_effective_query);
+}
+
+// we test with a callback function to our handler
+function test_case_effective_query(err, response) {
+
+    if (err) {
+        console.error(err);
+    } else {
+
+        assert.equal(response.headers['Content-Type'], 'text/json', 'content type is not text/json');
+        assert.equal(response.statusCode, 200, 'status code must be 200');
+
+        results = response.results;
+        for (let query in response.results) {
+
+            assert.containsAllKeys(response.results, effective_query_keywords, 'not all keywords were scraped.');
+
+            for (let page_number in response.results[query]) {
+
+                assert.isNumber(parseInt(page_number), 'page_number must be numeric');
+
+                let obj = response.results[query][page_number];
+
+                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results', 'effective_query'], 'not all keys are in the object');
+
+                // effective query must be different to the original keyword
+                assert.isOk(obj.effective_query, 'effective query must be ok');
+                assert.isNotEmpty(obj.effective_query, 'effective query must be valid');
+                assert(obj.effective_query !== query, 'effective query must be different from keyword');
+
+                assert.isAtLeast(obj.results.length, 7, 'results must have at least 7 SERP objects');
+                assert.equal(obj.no_results, false, 'no results should be false');
+                assert.typeOf(obj.num_results, 'string', 'num_results must be a string');
+                assert.isAtLeast(obj.num_results.length, 5, 'num_results should be a string of at least 5 chars');
+                assert.typeOf(Date.parse(obj.time), 'number', 'time should be a valid date');
+            }
+        }
+    }
+}
+
+(async () => {
+    await normal_search_test();
+    await no_results_test();
+    await effective_query_test();
+})();
\ No newline at end of file
diff --git a/test/test_duckduckgo.js b/test/test_duckduckgo.js
new file mode 100644
index 0000000..b51f95d
--- /dev/null
+++ b/test/test_duckduckgo.js
@@ -0,0 +1,144 @@
+const se_scraper =  require('./../index.js');
+var assert = require('chai').assert;
+
+/*
+ * Use chai and mocha for tests.
+ * https://mochajs.org/#installation
+ */
+
+const normal_search_keywords = ['apple tree', 'weather tomorrow'];
+
+async function normal_search_test() {
+    let config = {
+        search_engine: 'duckduckgo',
+        compress: false,
+        debug: false,
+        verbose: false,
+        keywords: normal_search_keywords,
+        keyword_file: '',
+        num_pages: 2,
+        headless: true,
+        output_file: '',
+        block_assets: true,
+        user_agent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36',
+        random_user_agent: false,
+    };
+
+    console.log('normal_search_test()');
+    await se_scraper.scrape(config, normal_search_test_case);
+}
+
+// we test with a callback function to our handler
+function normal_search_test_case(err, response) {
+
+    if (err) {
+        console.error(err);
+    } else {
+        assert.equal(response.headers['Content-Type'], 'text/json', 'content type is not text/json');
+        assert.equal(response.statusCode, 200, 'status code must be 200');
+
+        let total_rank = 1;
+
+        for (let query in response.results) {
+
+            assert.containsAllKeys(response.results, normal_search_keywords, 'not all keywords were scraped.');
+
+            for (let page_number in response.results[query]) {
+
+                assert.isNumber(parseInt(page_number), 'page_number must be numeric');
+
+                let obj = response.results[query][page_number];
+
+                assert.containsAllKeys(obj, ['results', 'time', 'effective_query'], 'not all keys are in the object');
+
+                assert.isAtLeast(obj.results.length, 7, 'results must have at least 7 SERP objects');
+                assert.typeOf(Date.parse(obj.time), 'number', 'time should be a valid date');
+
+                for (let res of obj.results) {
+
+                    assert.containsAllKeys(res, ['link', 'title', 'rank', 'visible_link', 'rank'], 'not all keys are in the SERP object');
+
+                    assert.isOk(res.link, 'link must be ok');
+                    assert.typeOf(res.link, 'string', 'link must be string');
+                    assert.isAtLeast(res.link.length, 5, 'link must have at least 5 chars');
+
+                    assert.isOk(res.visible_link, 'visible_link must be ok');
+                    assert.typeOf(res.visible_link, 'string', 'visible_link must be string');
+                    assert.isAtLeast(res.visible_link.length, 5, 'visible_link must have at least 5 chars');
+
+                    assert.isOk(res.title, 'title must be ok');
+                    assert.typeOf(res.title, 'string', 'title must be string');
+                    assert.isAtLeast(res.title.length, 5, 'title must have at least 5 chars');
+
+                    assert.isOk(res.snippet, 'snippet must be ok');
+                    assert.typeOf(res.snippet, 'string', 'snippet must be string');
+                    assert.isAtLeast(res.snippet.length, 10, 'snippet must have at least 10 chars');
+
+                    assert.isNumber(res.rank, 'rank must be integer');
+                    assert.equal(res.rank, total_rank++, 'rank ist wrong');
+                }
+            }
+        }
+    }
+}
+
+const effective_query_keywords = ['mount everrest'];
+
+async function effective_query_test() {
+    let config = {
+        search_engine: 'duckduckgo',
+        compress: false,
+        debug: false,
+        verbose: false,
+        keywords: effective_query_keywords,
+        keyword_file: '',
+        num_pages: 1,
+        headless: true,
+        output_file: '',
+        block_assets: true,
+        user_agent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36',
+        random_user_agent: false,
+    };
+    console.log('effective_query_test()');
+    await se_scraper.scrape(config, test_case_effective_query);
+}
+
+// we test with a callback function to our handler
+function test_case_effective_query(err, response) {
+
+    if (err) {
+        console.error(err);
+    } else {
+
+        assert.equal(response.headers['Content-Type'], 'text/json', 'content type is not text/json');
+        assert.equal(response.statusCode, 200, 'status code must be 200');
+
+        results = response.results;
+        for (let query in response.results) {
+
+            assert.containsAllKeys(response.results, effective_query_keywords, 'not all keywords were scraped.');
+
+            for (let page_number in response.results[query]) {
+
+                assert.isNumber(parseInt(page_number), 'page_number must be numeric');
+
+                let obj = response.results[query][page_number];
+
+                assert.containsAllKeys(obj, ['results', 'time', 'effective_query'], 'not all keys are in the object');
+
+                // effective query must be different to the original keyword
+                assert.isOk(obj.effective_query, 'effective query must be ok');
+                assert.isNotEmpty(obj.effective_query, 'effective query must be valid');
+                assert(obj.effective_query !== query, 'effective query must be different from keyword');
+
+                assert.isAtLeast(obj.results.length, 7, 'results must have at least 7 SERP objects');
+                assert.typeOf(Date.parse(obj.time), 'number', 'time should be a valid date');
+            }
+        }
+    }
+}
+
+(async () => {
+    await normal_search_test();
+    await effective_query_test();
+})();
\ No newline at end of file
diff --git a/test/test_google.js b/test/test_google.js
index 9b78736..7484270 100644
--- a/test/test_google.js
+++ b/test/test_google.js
@@ -6,12 +6,6 @@ var assert = require('chai').assert;
  * https://mochajs.org/#installation
  */
 
-function sleep(ms) {
-    return new Promise(resolve => {
-        setTimeout(resolve, ms)
-    })
-}
-
 const normal_search_keywords = ['apple tree', 'weather tomorrow'];
 
 async function normal_search_test() {
@@ -55,7 +49,7 @@ function normal_search_test_case(err, response) {
 
                 let obj = response.results[query][page_number];
 
-                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results'], 'not all keys are in the object');
+                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results', 'effective_query'], 'not all keys are in the object');
 
                 assert.isAtLeast(obj.results.length, 8, 'results must have at least 8 SERP objects');
                 assert.equal(obj.no_results, false, 'no results should be false');
@@ -65,12 +59,16 @@ function normal_search_test_case(err, response) {
 
                 for (let res of obj.results) {
 
-                    assert.containsAllKeys(res, ['link', 'title', 'rank'], 'not all keys are in the SERP object');
+                    assert.containsAllKeys(res, ['link', 'title', 'rank', 'visible_link', 'rank'], 'not all keys are in the SERP object');
 
                     assert.isOk(res.link, 'link must be ok');
                     assert.typeOf(res.link, 'string', 'link must be string');
                     assert.isAtLeast(res.link.length, 5, 'link must have at least 5 chars');
 
+                    assert.isOk(res.visible_link, 'visible_link must be ok');
+                    assert.typeOf(res.visible_link, 'string', 'visible_link must be string');
+                    assert.isAtLeast(res.visible_link.length, 5, 'visible_link must have at least 5 chars');
+
                     assert.isOk(res.title, 'title must be ok');
                     assert.typeOf(res.title, 'string', 'title must be string');
                     assert.isAtLeast(res.title.length, 10, 'title must have at least 10 chars');
@@ -87,7 +85,6 @@ function normal_search_test_case(err, response) {
     }
 }
 
-
 const keywords_no_results = ['fgskl34440abJAksafkl34a44dsflkjaQQuBBdfk',];
 
 async function no_results_test() {
@@ -127,7 +124,7 @@ function test_case_no_results(err, response) {
 
                 let obj = response.results[query][page_number];
 
-                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results'], 'not all keys are in the object');
+                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results', 'effective_query'], 'not all keys are in the object');
 
                 assert(obj.results.length === 0, 'results must have 0 SERP objects');
                 assert.equal(obj.no_results, true, 'no results should be true');
@@ -180,7 +177,7 @@ function test_case_effective_query(err, response) {
 
                 let obj = response.results[query][page_number];
 
-                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results'], 'not all keys are in the object');
+                assert.containsAllKeys(obj, ['results', 'time', 'no_results', 'num_results', 'effective_query'], 'not all keys are in the object');
 
                 // effective query must be different to the original keyword
                 assert.isOk(obj.effective_query, 'effective query must be ok');
@@ -197,7 +194,6 @@ function test_case_effective_query(err, response) {
     }
 }
 
-
 (async () => {
     await normal_search_test();
     await no_results_test();