Add integration test for host metadata resolution

Port of Python SDK PR #1332. Verifies that EnsureResolved with
Experimental_IsUnifiedHost populates account_id and workspace_id
from the host metadata endpoint on workspace environments.

Co-authored-by: Isaac

Author: hectorcast-db

internal/host_metadata_test.go

@@ -0,0 +1,31 @@
+package internal
+
+import (
+	"testing"
+
+	"github.com/databricks/databricks-sdk-go/config"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestHostMetadataResolution(t *testing.T) {
+	loadDebugEnvIfRunsFromIDE(t, "workspace")
+	t.Log(GetEnvOrSkipTest(t, "CLOUD_ENV"))
+	envType := testEnvironmentType()
+	if envType != "" {
+		if envType != "WORKSPACE" && envType != "UC_WORKSPACE" {
+			skipf(t)("Skipping workspace test: TEST_ENVIRONMENT_TYPE=%s", envType)
+		}
+	}
+	t.Parallel()
+
+	cfg := &config.Config{
+		Experimental_IsUnifiedHost: true,
+	}
+	err := cfg.EnsureResolved()
+	require.NoError(t, err)
+
+	assert.NotEmpty(t, cfg.AccountID, "expected account_id to be resolved from host metadata")
+	// Workspace hosts should always have a workspace_id in metadata.
+	assert.NotEmpty(t, cfg.WorkspaceID, "expected workspace_id to be resolved from host metadata")
+}