diff --git a/test/e2e/tests/data-explorer/histogram-rounding.test.ts b/test/e2e/tests/data-explorer/histogram-rounding.test.ts
new file mode 100644
index 000000000000..589894a295b7
--- /dev/null
+++ b/test/e2e/tests/data-explorer/histogram-rounding.test.ts
@@ -0,0 +1,134 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (C) 2025 Posit Software, PBC. All rights reserved.
+ *  Licensed under the Elastic License 2.0. See LICENSE.txt for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+/**
+ * This test suite verifies that histogram bin ranges in the Data Explorer are properly rounded
+ * and displayed with appropriate precision for different numeric scales.
+ *
+ * The Data Explorer generates histograms for numeric columns with binned ranges. This suite tests
+ * that the bin edge values are correctly rounded and formatted across various data ranges:
+ * - Integer ranges (whole numbers)
+ * - Positive decimal ranges
+ * - Ranges spanning negative to positive values
+ * - Very small values requiring scientific notation
+ *
+ * Each test case creates a DataFrame with specific numeric values, opens it in the Data Explorer,
+ * displays the summary panel with histograms, and verifies that hovering over histogram bins shows
+ * tooltips with the expected rounded range values.
+ *
+ * Histogram Rounding Test Cases
+ *
+ * | Case | Data Range        | Expected Bins                                      | Description                          |
+ * |------|-------------------|----------------------------------------------------|--------------------------------------|
+ * | 1    | 0.0 → 100.0       | 0–33, 34–66, 67–100                                | Integer range with whole number bins |
+ * | 2    | 1.10 → 3.90       | 1.10–2.03, 2.03–2.97, 2.97–3.90                    | Decimal range with 2-digit precision  |
+ * | 3    | -1.10 → 2.00      | -1.10–0.4500, 0.4500–2.00                          | Mixed negative/positive decimal range |
+ * | 4    | -0.0001 → 0.00009 | -0.0001–-5.00E-06, -5.00E-06–9.00E-05              | Very small values with scientific notation |
+ */
+
+import { test, tags } from '../_test.setup';
+
+test.use({
+  suiteId: __filename
+});
+
+test.describe('Data Explorer - Histogram Rounding', {
+  tag: [tags.WEB, tags.WIN, tags.DATA_EXPLORER]
+}, () => {
+
+  test.beforeEach(async ({ hotKeys }) => {
+    await hotKeys.stackedLayout();
+  });
+
+  test.afterEach(async ({ hotKeys }) => {
+    await hotKeys.closeAllEditors();
+  });
+
+  const hoverBinWithRange = async (page: any, expectedMin: string, expectedMax: string) => {
+    const bins = page.locator('.vector-histogram foreignObject.tooltip-container');
+    const count = await bins.count();
+    if (count === 0) {
+      throw new Error('No histogram bins found');
+    }
+
+    for (let i = 0; i < count; i++) {
+      await bins.nth(i).hover();
+      const tooltip = page.locator('.hover-contents');
+      await tooltip.waitFor({ state: 'visible', timeout: 5000 });
+      const text = await tooltip.innerText();
+      if (text.includes(`Range: ${expectedMin} to ${expectedMax}`)) {
+        return; // matched expected range
+      }
+    }
+
+    throw new Error(`No bin tooltip matched Range: ${expectedMin} to ${expectedMax}`);
+  };
+
+  const cases = [
+    {
+      name: 'Case 1: 0.0 → 100.0 → Bins: 0–33, 34–66, 67–100',
+      varName: 'histRound1',
+      python: `import pandas as pd\n# Integer range 0..100\nhistRound1 = pd.DataFrame({'x': list(range(0, 101, 10))})`,
+      expectedPairs: [
+        { min: '0', max: '33' },
+        { min: '34', max: '66' },
+        { min: '67', max: '100' }
+      ]
+    },
+    {
+      name: 'Case 2: 1.10 → 3.90 → Bins: 1.10–2.03, 2.03–2.97, 2.97–3.90',
+      varName: 'histRound2',
+      python: `import pandas as pd\n# Floating range ~[1.1, 3.9]\nhistRound2 = pd.DataFrame({'x': [1.1, 1.8, 2.0, 2.5, 3.0, 3.4, 3.9]})`,
+      expectedPairs: [
+        { min: '1.10', max: '2.03' },
+        { min: '2.03', max: '2.97' },
+        { min: '2.97', max: '3.90' }
+      ]
+    },
+    {
+      name: 'Case 3: -1.10 → 2.00 → Bins: -1.10–0.4500, 0.4500–2.00',
+      varName: 'histRound3',
+      python: `import pandas as pd\n# Floating range ~[-1.1, 2.0]\nhistRound3 = pd.DataFrame({'x': [-1.1, -0.5, 0.0, 1.1, 2.0]})`,
+      expectedPairs: [
+        { min: '-1.10', max: '0.4500' },
+        { min: '0.4500', max: '2.00' }
+      ]
+    },
+    {
+      name: 'Case 4: -0.0001 → 0.00009 → Bins: -0.0001–-5.00E-06, -5.00E-06–9.00E-05',
+      varName: 'histRound4',
+      python: `import pandas as pd\n# Tiny values around zero\nhistRound4 = pd.DataFrame({'x': [-0.0001, -0.00005, 0.0, 0.00005, 0.00009]})`,
+      expectedPairs: [
+        { min: '-0.0001', max: '-5.00E-06' },
+        { min: '-5.00E-06', max: '9.00E-05' }
+      ]
+    }
+  ];
+
+  for (const c of cases) {
+    test(c.name, async ({ app, executeCode, hotKeys, python }) => {
+      const { dataExplorer, variables, editors } = app.workbench;
+      const { page } = app.code.driver;
+
+      await executeCode('Python', c.python);
+
+      await variables.doubleClickVariableRow(c.varName);
+      await editors.verifyTab(`Data: ${c.varName}`, { isVisible: true });
+
+      await hotKeys.closePrimarySidebar();
+      await hotKeys.closeSecondarySidebar();
+
+      await dataExplorer.summaryPanel.show();
+
+      // Ensure a histogram is present
+      await page.locator('.vector-histogram').first().waitFor({ state: 'visible', timeout: 10000 });
+
+      // Hover bins until all expected ranges are found
+      for (const pair of c.expectedPairs) {
+        await hoverBinWithRange(page, pair.min, pair.max);
+      }
+    });
+  }
+});
diff --git a/test/e2e/tests/extensions/lsp-pyrefly.test.ts b/test/e2e/tests/extensions/lsp-pyrefly.test.ts
new file mode 100644
index 000000000000..59f569a1b3a8
--- /dev/null
+++ b/test/e2e/tests/extensions/lsp-pyrefly.test.ts
@@ -0,0 +1,27 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (C) 2025 Posit Software, PBC. All rights reserved.
+ *  Licensed under the Elastic License 2.0. See LICENSE.txt for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+// Suite: Positron LSP: Pyrefly Integration (Untitled Files)
+// CI safety notes:
+// - Creates unsaved scratch buffers only; no workspace file I/O (for now)
+// - Avoids workspace-wide indexing; relies on minimal interactions
+
+import { test, expect, tags } from '../_test.setup';
+
+test.use({ suiteId: __filename });
+
+test.describe('Positron LSP: Pyrefly Integration (Untitled)', { tag: [tags.WEB, tags.WIN, tags.EXTENSIONS, tags.EDITOR] }, () => {
+
+  test('Basic Completion Suggestion', async function ({ app, runCommand }) {
+    await runCommand('python.createNewFile');
+    await app.workbench.editors.waitForEditorFocus('Untitled-1');
+    await app.workbench.clipboard.setClipboardText('import math\nm');
+    await app.workbench.clipboard.paste();
+    await app.workbench.editors.expectEditorToContain('import math');
+    await app.code.driver.page.keyboard.press('Control+Space');
+    await expect(app.code.driver.page.locator('.suggest-widget')).toBeVisible();
+  });
+
+});