Backport tests from ent. (#15260)

* Backport agent tests.

Original commit: 0710b2d12fb51a29cedd1119b5fb086e5c71f632
Original commit: aaedb3c28bfe247266f21013d500147d8decb7cd (partial)

* Backport test fix and reduce flaky failures.

agent/agent_test.go

@@ -326,7 +326,9 @@ func TestAgent_HTTPMaxHeaderBytes(t *testing.T) {
 				},
 				Cache: cache.New(cache.Options{}),
 			}
-			bd, err = initEnterpriseBaseDeps(bd, nil)
+
+			cfg := config.RuntimeConfig{BuildDate: time.Date(2000, 1, 1, 0, 0, 1, 0, time.UTC)}
+			bd, err = initEnterpriseBaseDeps(bd, &cfg)
 			require.NoError(t, err)
 
 			a, err := New(bd)
@@ -5418,7 +5420,8 @@ func TestAgent_ListenHTTP_MultipleAddresses(t *testing.T) {
 		Cache: cache.New(cache.Options{}),
 	}
 
-	bd, err = initEnterpriseBaseDeps(bd, nil)
+	cfg := config.RuntimeConfig{BuildDate: time.Date(2000, 1, 1, 0, 0, 1, 0, time.UTC)}
+	bd, err = initEnterpriseBaseDeps(bd, &cfg)
 	require.NoError(t, err)
 
 	agent, err := New(bd)
@@ -6003,7 +6006,7 @@ func TestAgent_startListeners(t *testing.T) {
 		Cache: cache.New(cache.Options{}),
 	}
 
-	bd, err := initEnterpriseBaseDeps(bd, nil)
+	bd, err := initEnterpriseBaseDeps(bd, &config.RuntimeConfig{})
 	require.NoError(t, err)
 
 	agent, err := New(bd)
@@ -6134,7 +6137,8 @@ func TestAgent_startListeners_scada(t *testing.T) {
 		Cache:         cache.New(cache.Options{}),
 	}
 
-	bd, err := initEnterpriseBaseDeps(bd, nil)
+	cfg := config.RuntimeConfig{BuildDate: time.Date(2000, 1, 1, 0, 0, 1, 0, time.UTC)}
+	bd, err := initEnterpriseBaseDeps(bd, &cfg)
 	require.NoError(t, err)
 
 	agent, err := New(bd)

agent/grpc-external/services/peerstream/stream_test.go

@@ -1159,7 +1159,7 @@ func TestStreamResources_Server_CARootUpdates(t *testing.T) {
 
 func TestStreamResources_Server_AckNackNonce(t *testing.T) {
 	srv, store := newTestServer(t, func(c *Config) {
-		c.incomingHeartbeatTimeout = 50 * time.Millisecond
+		c.incomingHeartbeatTimeout = 10 * time.Millisecond
 	})
 
 	p := writePeeringToBeDialed(t, store, 1, "my-peer")
@@ -1204,6 +1204,9 @@ func TestStreamResources_Server_AckNackNonce(t *testing.T) {
 		require.NoError(t, err)
 		require.Equal(t, "5678", msg.GetRequest().ResponseNonce)
 	})
+	// Add in a sleep to prevent the test from flaking.
+	// The mock client expects certain calls to be made.
+	time.Sleep(50 * time.Millisecond)
 }
 
 // Test that when the client doesn't send a heartbeat in time, the stream is disconnected.