test(agentcompat): add agent runtime harness

Co-authored-by: naiba/CloudCode <hi+cloudcode@nai.ba>

integration/agentcompat/internal/agent/readiness_server_id_test.go

@@ -0,0 +1,47 @@
+//go:build linux && agentcompat
+
+package agent
+
+import (
+	"encoding/json"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestServerGetResult_VerifiesListedServerIdentity_whenUUIDOrIDMismatch(t *testing.T) {
+	listed := serverListItem{ID: 81, UUID: "00000000-0000-0000-0000-000000000081", Online: true}
+	tests := []struct {
+		name   string
+		result serverGetResult
+	}{
+		{
+			name:   "UUID differs",
+			result: serverGetResult{ID: listed.ID, UUID: "00000000-0000-0000-0000-000000000082", Host: json.RawMessage(`{}`), State: json.RawMessage(`{}`)},
+		},
+		{
+			name:   "ID differs",
+			result: serverGetResult{ID: 82, UUID: listed.UUID, Host: json.RawMessage(`{}`), State: json.RawMessage(`{}`)},
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			result := test.result
+			err := verifyServerGetResult(listed, result)
+			require.Error(t, err)
+		})
+	}
+}
+
+func TestServerGetResult_RejectsZeroListedServerID_whenReturnedIdentityMatches(t *testing.T) {
+	// Given
+	listed := serverListItem{UUID: "00000000-0000-0000-0000-000000000081", Online: true}
+	result := serverGetResult{UUID: listed.UUID, Host: json.RawMessage(`{}`), State: json.RawMessage(`{}`)}
+
+	// When
+	err := verifyServerGetResult(listed, result)
+
+	// Then
+	require.Error(t, err)
+	require.EqualError(t, err, "dashboard server.get identity does not match server.list")
+}