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diff --git a/end-to-end-test/remote/screenshots/reference/shows_gaps_for_sex_track_with_correct_subgroup_percentages_element_chrome_1600x1000.png b/end-to-end-test/remote/screenshots/reference/shows_gaps_for_sex_track_with_correct_subgroup_percentages_element_chrome_1600x1000.png
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diff --git a/end-to-end-test/remote/specs/core/oncoprint.gaps.spec.js b/end-to-end-test/remote/specs/core/oncoprint.gaps.spec.js
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+++ b/end-to-end-test/remote/specs/core/oncoprint.gaps.spec.js
@@ -0,0 +1,75 @@
+const {
+    getNthOncoprintTrackOptionsElements,
+} = require('../../../shared/specUtils');
+var waitForOncoprint = require('../../../shared/specUtils').waitForOncoprint;
+
+var getElementByTestHandle = require('../../../shared/specUtils')
+    .getElementByTestHandle;
+
+var goToUrlAndSetLocalStorage = require('../../../shared/specUtils')
+    .goToUrlAndSetLocalStorage;
+var assertScreenShotMatch = require('../../../shared/lib/testUtils')
+    .assertScreenShotMatch;
+var setInputText = require('../../../shared/specUtils').setInputText;
+var waitForNumberOfStudyCheckboxes = require('../../../shared/specUtils')
+    .waitForNumberOfStudyCheckboxes;
+var checkOncoprintElement = require('../../../shared/specUtils')
+    .checkOncoprintElement;
+var getGroupHeaderOptionsElements = require('../../../shared/specUtils')
+    .getOncoprintGroupHeaderOptionsElements;
+var setDropdownOpen = require('../../../shared/specUtils').setDropdownOpen;
+
+const CBIOPORTAL_URL = process.env.CBIOPORTAL_URL.replace(/\/$/, '');
+
+const ONCOPRINT_TIMEOUT = 60000;
+
+describe('oncoprint gap screenshot tests', function() {
+    before(() => {
+        goToUrlAndSetLocalStorage(
+            `${CBIOPORTAL_URL}/results/oncoprint?cancer_study_list=coadread_tcga_pub&cancer_study_id=coadread_tcga_pub&genetic_profile_ids_PROFILE_MUTATION_EXTENDED=coadread_tcga_pub_mutations&genetic_profile_ids_PROFILE_COPY_NUMBER_ALTERATION=coadread_tcga_pub_gistic&Z_SCORE_THRESHOLD=2.0&case_set_id=coadread_tcga_pub_cna&gene_list=BCHE%252CCDK8%252CCTBP1%252CACKR3&gene_set_choice=user-defined-list&&clinicallist=SEX,CANCER_TYPE_DETAILED&profileFilter=mutations%2Cgistic&geneset_list=%20&tab_index=tab_visualize&Action=Submit`
+        );
+        waitForOncoprint(ONCOPRINT_TIMEOUT);
+    });
+    it('shows gaps for sex track with correct subgroup percentages', function() {
+        const sexElements = getNthOncoprintTrackOptionsElements(1);
+        setDropdownOpen(
+            true,
+            sexElements.button_selector,
+            sexElements.dropdown_selector,
+            'Failed to open sex track menu'
+        );
+        $(`${sexElements.dropdown_selector} li:nth-child(9)`).click(); // Click "show gaps"
+        browser.pause(100); // give time to sort and insert gaps
+
+        waitForOncoprint(ONCOPRINT_TIMEOUT);
+
+        $('.oncoprint__zoom-controls .fa-search-minus').click();
+        $('.oncoprint__zoom-controls .fa-search-minus').click();
+
+        browser.pause(100); // give time to rezoom
+
+        const res = checkOncoprintElement('.oncoprintContainer');
+        assertScreenShotMatch(res);
+    });
+
+    it('hierarchical sorting when two tracks have enabled gaps', () => {
+        const cancerTypeDetailedElements = getNthOncoprintTrackOptionsElements(
+            2
+        );
+        setDropdownOpen(
+            true,
+            cancerTypeDetailedElements.button_selector,
+            cancerTypeDetailedElements.dropdown_selector,
+            'Failed to open cancer type detailed track menu'
+        );
+        $(
+            `${cancerTypeDetailedElements.dropdown_selector} li:nth-child(9)`
+        ).click(); // Click "show gaps"
+        browser.pause(100); // give time to sort and insert gaps
+
+        waitForOncoprint(ONCOPRINT_TIMEOUT);
+
+        const res = checkOncoprintElement('.oncoprintContainer');
+        assertScreenShotMatch(res);
+    });
+});