Fix fake-test-model in all languages, regenerate snapshots

The runtime 1.0.20-1 validates model names and rejects 'fake-test-model'.
Replace with 'claude-sonnet-4.5' in Python, Go, C# session tests
(Node was already fixed). Regenerate all affected snapshots.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: SteveSandersonMS

dotnet/test/SessionTests.cs

@@ -16,7 +16,7 @@ public class SessionTests(E2ETestFixture fixture, ITestOutputHelper output) : E2
     [Fact]
     public async Task ShouldCreateAndDisconnectSessions()
     {
-        var session = await CreateSessionAsync(new SessionConfig { Model = "fake-test-model" });
+        var session = await CreateSessionAsync(new SessionConfig { Model = "claude-sonnet-4.5" });
 
         Assert.Matches(@"^[a-f0-9-]+$", session.SessionId);
 

go/internal/e2e/session_test.go

@@ -20,7 +20,7 @@ func TestSession(t *testing.T) {
 	t.Run("should create and disconnect sessions", func(t *testing.T) {
 		ctx.ConfigureForTest(t)
 
-		session, err := client.CreateSession(t.Context(), &copilot.SessionConfig{OnPermissionRequest: copilot.PermissionHandler.ApproveAll, Model: "fake-test-model"})
+		session, err := client.CreateSession(t.Context(), &copilot.SessionConfig{OnPermissionRequest: copilot.PermissionHandler.ApproveAll, Model: "claude-sonnet-4.5"})
 		if err != nil {
 			t.Fatalf("Failed to create session: %v", err)
 		}
@@ -43,8 +43,8 @@ func TestSession(t *testing.T) {
 			t.Errorf("Expected session.start sessionId to match")
 		}
 
-		if messages[0].Data.SelectedModel == nil || *messages[0].Data.SelectedModel != "fake-test-model" {
-			t.Errorf("Expected selectedModel to be 'fake-test-model', got %v", messages[0].Data.SelectedModel)
+		if messages[0].Data.SelectedModel == nil || *messages[0].Data.SelectedModel != "claude-sonnet-4.5" {
+			t.Errorf("Expected selectedModel to be 'claude-sonnet-4.5', got %v", messages[0].Data.SelectedModel)
 		}
 
 		if err := session.Disconnect(); err != nil {

python/e2e/test_session.py

@@ -17,15 +17,15 @@
 class TestSessions:
     async def test_should_create_and_disconnect_sessions(self, ctx: E2ETestContext):
         session = await ctx.client.create_session(
-            on_permission_request=PermissionHandler.approve_all, model="fake-test-model"
+            on_permission_request=PermissionHandler.approve_all, model="claude-sonnet-4.5"
         )
         assert session.session_id
 
         messages = await session.get_messages()
         assert len(messages) > 0
         assert messages[0].type.value == "session.start"
         assert messages[0].data.session_id == session.session_id
-        assert messages[0].data.selected_model == "fake-test-model"
+        assert messages[0].data.selected_model == "claude-sonnet-4.5"
 
         await session.disconnect()
 

test/snapshots/session_config/vision_disabled_then_enabled_via_setmodel.yaml

@@ -6,8 +6,6 @@ conversations:
         content: ${system}
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
-      - role: assistant
-        content: I'll view the test.png file for you.
       - role: assistant
         tool_calls:
           - id: toolcall_0
@@ -28,7 +26,6 @@ conversations:
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
       - role: assistant
-        content: I'll view the test.png file for you.
         tool_calls:
           - id: toolcall_0
             type: function
@@ -47,13 +44,11 @@ conversations:
         tool_call_id: toolcall_1
         content: Viewed image file successfully.
       - role: assistant
-        content: The image shows a **GitHub Copilot logo** - it's the distinctive orange/coral colored hexagonal icon with a
-          stylized design inside. The logo appears on a transparent background and is the standard branding mark for
-          GitHub Copilot.
+        content: I can see the image shows **GitHub Copilot** branding. The image contains the GitHub Copilot logo (a hexagonal
+          icon with colorful segments) along with text that reads "GitHub Copilot" in a clean, modern font. The design
+          appears to be on a dark background, typical of GitHub's branding materials.
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
-      - role: assistant
-        content: I'll view the test.png file again for you.
       - role: assistant
         tool_calls:
           - id: toolcall_2
@@ -74,7 +69,6 @@ conversations:
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
       - role: assistant
-        content: I'll view the test.png file for you.
         tool_calls:
           - id: toolcall_0
             type: function
@@ -93,13 +87,12 @@ conversations:
         tool_call_id: toolcall_1
         content: Viewed image file successfully.
       - role: assistant
-        content: The image shows a **GitHub Copilot logo** - it's the distinctive orange/coral colored hexagonal icon with a
-          stylized design inside. The logo appears on a transparent background and is the standard branding mark for
-          GitHub Copilot.
+        content: I can see the image shows **GitHub Copilot** branding. The image contains the GitHub Copilot logo (a hexagonal
+          icon with colorful segments) along with text that reads "GitHub Copilot" in a clean, modern font. The design
+          appears to be on a dark background, typical of GitHub's branding materials.
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
       - role: assistant
-        content: I'll view the test.png file again for you.
         tool_calls:
           - id: toolcall_2
             type: function
@@ -119,18 +112,7 @@ conversations:
         content: Viewed image file successfully.
       - role: user
       - role: assistant
-        content: >-
-          Looking at the image you've shared, I can see it appears to be a mostly **white or very light colored image**
-          with what looks like some very faint, barely visible marks or content. The image is quite minimal and appears
-          to be either:
-
-
-          - A nearly blank white image
-
-          - An image with extremely light/faded content that's difficult to discern
-
-          - Possibly some very subtle texture or pattern on a white background
-
-
-          I apologize for my earlier incorrect description about the GitHub Copilot logo - that was not accurate. This
-          image is actually quite sparse and minimal in content.
+        content: Looking at the image, I can see a very simple, minimalist graphic. It appears to be a small, pale rectangular
+          shape (possibly light beige or cream colored) on a white background. The rectangle looks like it might be a
+          simple placeholder, button, or UI element. The image is quite small and doesn't contain any text, icons, or
+          complex graphics - just this basic rectangular form.

test/snapshots/session_config/vision_enabled_then_disabled_via_setmodel.yaml

@@ -7,15 +7,10 @@ conversations:
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
       - role: assistant
-        tool_calls:
-          - id: toolcall_0
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
+        content: I'll view the test.png file for you.
       - role: assistant
         tool_calls:
-          - id: toolcall_1
+          - id: toolcall_0
             type: function
             function:
               name: view
@@ -26,165 +21,76 @@ conversations:
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
       - role: assistant
+        content: I'll view the test.png file for you.
         tool_calls:
           - id: toolcall_0
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
-          - id: toolcall_1
             type: function
             function:
               name: view
               arguments: '{"path":"${workdir}/test.png"}'
       - role: tool
         tool_call_id: toolcall_0
-        content: Intent logged
-      - role: tool
-        tool_call_id: toolcall_1
         content: Viewed image file successfully.
       - role: user
       - role: assistant
         content: >-
-          I can see the test.png file. It appears to be a very light, mostly white or blank image. The image is
-          extremely faint or washed out - if there is any content in it, it's barely visible against the white
-          background. It could be:
+          The image appears to be almost entirely blank or white. There's a very subtle, light yellowish or
+          cream-colored tint, but no discernible text, graphics, or other visual elements are visible. It looks like
+          either:
 
 
-          - A blank/empty white image
+          1. A blank/empty image file
 
-          - An image with very low contrast or heavily overexposed content
+          2. An extremely faded or overexposed image
 
-          - An image with extremely faint watermarks or text that's nearly invisible
+          3. A placeholder image with just a very light background color
 
 
-          Is this what you expected to see, or should there be more visible content in this image?
+          The image doesn't contain any meaningful visual content that I can detect.
   - messages:
       - role: system
         content: ${system}
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
       - role: assistant
+        content: I'll view the test.png file for you.
         tool_calls:
           - id: toolcall_0
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
-          - id: toolcall_1
             type: function
             function:
               name: view
               arguments: '{"path":"${workdir}/test.png"}'
       - role: tool
         tool_call_id: toolcall_0
-        content: Intent logged
-      - role: tool
-        tool_call_id: toolcall_1
         content: Viewed image file successfully.
       - role: assistant
         content: >-
-          I can see the test.png file. It appears to be a very light, mostly white or blank image. The image is
-          extremely faint or washed out - if there is any content in it, it's barely visible against the white
-          background. It could be:
+          The image appears to be almost entirely blank or white. There's a very subtle, light yellowish or
+          cream-colored tint, but no discernible text, graphics, or other visual elements are visible. It looks like
+          either:
 
 
-          - A blank/empty white image
+          1. A blank/empty image file
 
-          - An image with very low contrast or heavily overexposed content
+          2. An extremely faded or overexposed image
 
-          - An image with extremely faint watermarks or text that's nearly invisible
+          3. A placeholder image with just a very light background color
 
 
-          Is this what you expected to see, or should there be more visible content in this image?
+          The image doesn't contain any meaningful visual content that I can detect.
       - role: user
         content: Use the view tool to look at the file test.png and describe what you see
       - role: assistant
         tool_calls:
-          - id: toolcall_2
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
-      - role: assistant
-        tool_calls:
-          - id: toolcall_3
-            type: function
-            function:
-              name: view
-              arguments: '{"path":"${workdir}/test.png"}'
-  - messages:
-      - role: system
-        content: ${system}
-      - role: user
-        content: Use the view tool to look at the file test.png and describe what you see
-      - role: assistant
-        tool_calls:
-          - id: toolcall_0
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
           - id: toolcall_1
             type: function
             function:
               name: view
               arguments: '{"path":"${workdir}/test.png"}'
-      - role: tool
-        tool_call_id: toolcall_0
-        content: Intent logged
       - role: tool
         tool_call_id: toolcall_1
         content: Viewed image file successfully.
       - role: assistant
-        content: >-
-          I can see the test.png file. It appears to be a very light, mostly white or blank image. The image is
-          extremely faint or washed out - if there is any content in it, it's barely visible against the white
-          background. It could be:
-
-
-          - A blank/empty white image
-
-          - An image with very low contrast or heavily overexposed content
-
-          - An image with extremely faint watermarks or text that's nearly invisible
-
-
-          Is this what you expected to see, or should there be more visible content in this image?
-      - role: user
-        content: Use the view tool to look at the file test.png and describe what you see
-      - role: assistant
-        tool_calls:
-          - id: toolcall_2
-            type: function
-            function:
-              name: report_intent
-              arguments: '{"intent":"Viewing image file"}'
-          - id: toolcall_3
-            type: function
-            function:
-              name: view
-              arguments: '{"path":"${workdir}/test.png"}'
-      - role: tool
-        tool_call_id: toolcall_2
-        content: Intent logged
-      - role: tool
-        tool_call_id: toolcall_3
-        content: Viewed image file successfully.
-      - role: assistant
-        content: >-
-          I can see the test.png image. It shows what appears to be a very faint or washed-out image - it's
-          predominantly white with possibly some very light content that's difficult to discern. The image appears to be
-          either:
-
-
-          1. A blank white image
-
-          2. An extremely overexposed photograph
-
-          3. An image with very low contrast where any content is barely visible
-
-
-          Without more visible detail, I cannot identify specific objects, text, or patterns in the image. If there's
-          supposed to be clear content in this image, it may be a display/rendering issue, or the image file itself
-          might be corrupted or improperly saved.
+        content: The image shows what appears to be a very light, nearly white background with an extremely subtle yellowish or
+          cream tint. There are no visible text elements, shapes, graphics, or other discernible content in the image.
+          It's essentially a blank or nearly blank image file.