fix: add diagnostic logging to TC-SH-014 and TC-SH-015 E2E tests

Log response status and body before assertions to debug failures.
Read response as text first, then parse JSON, so CI output shows
the actual error returned by the gateway.

Signed-off-by: Myko <myko@mcpmux.com>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash

tests/e2e/specs/streamable-http.wdio.ts

@@ -345,6 +345,7 @@ describe('Streamable HTTP: OAuth MCP Client Flow', function () {
   // --------------------------------------------------------------------------
   it('TC-SH-014: Authenticated initialize request to /mcp', async () => {
     const token = await obtainAccessToken(clientId, 'http://localhost:0/callback', gatewayPort);
+    console.log('[test] Token obtained, length:', token.length);
 
     // Send MCP initialize request
     const res = await fetch(`http://localhost:${gatewayPort}/mcp`, {
@@ -368,10 +369,17 @@ describe('Streamable HTTP: OAuth MCP Client Flow', function () {
       }),
     });
 
-    console.log('[test] Initialize response status:', res.status);
-    expect(res.ok).toBe(true);
+    console.log('[test] Initialize response status:', res.status, res.statusText);
+    const responseText = await res.text();
+    console.log('[test] Initialize response body:', responseText.substring(0, 1000));
 
-    const body = await res.json() as {
+    // If response is not OK, provide detailed failure info
+    if (!res.ok) {
+      console.log('[test] FAILURE: /mcp returned', res.status, '- body:', responseText);
+    }
+    expect(res.status).toBeLessThan(400);
+
+    const body = JSON.parse(responseText) as {
       jsonrpc: string;
       id: number;
       result?: {
@@ -414,6 +422,7 @@ describe('Streamable HTTP: OAuth MCP Client Flow', function () {
   // --------------------------------------------------------------------------
   it('TC-SH-015: Session ID returned and usable', async () => {
     const token = await obtainAccessToken(clientId, 'http://localhost:0/callback', gatewayPort);
+    console.log('[test] Token for session test, length:', token.length);
 
     // Initialize to get session ID
     const initRes = await fetch(`http://localhost:${gatewayPort}/mcp`, {
@@ -434,7 +443,13 @@ describe('Streamable HTTP: OAuth MCP Client Flow', function () {
       }),
     });
 
-    expect(initRes.ok).toBe(true);
+    console.log('[test] Session init status:', initRes.status, initRes.statusText);
+    const initText = await initRes.text();
+    console.log('[test] Session init body:', initText.substring(0, 1000));
+    if (!initRes.ok) {
+      console.log('[test] FAILURE: /mcp returned', initRes.status, '- body:', initText);
+    }
+    expect(initRes.status).toBeLessThan(400);
 
     // Check for Mcp-Session-Id in response headers
     const sessionId = initRes.headers.get('mcp-session-id');