feat: add unit test for exit code 127

wait/host_port_test.go

@@ -508,3 +508,58 @@ func TestHostPortStrategySucceedsGivenShellIsNotInstalled(t *testing.T) {
 	err = wg.WaitUntilReady(context.Background(), target)
 	require.NoError(t, err)
 }
+
+func TestHostPortStrategySucceedsGivenShellIsNotFound(t *testing.T) {
+	listener, err := net.Listen("tcp", "localhost:0")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer listener.Close()
+
+	rawPort := listener.Addr().(*net.TCPAddr).Port
+	port, err := nat.NewPort("tcp", strconv.Itoa(rawPort))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	target := &MockStrategyTarget{
+		HostImpl: func(_ context.Context) (string, error) {
+			return "localhost", nil
+		},
+		InspectImpl: func(_ context.Context) (*types.ContainerJSON, error) {
+			return &types.ContainerJSON{
+				NetworkSettings: &types.NetworkSettings{
+					NetworkSettingsBase: types.NetworkSettingsBase{
+						Ports: nat.PortMap{
+							"80": []nat.PortBinding{
+								{
+									HostIP:   "0.0.0.0",
+									HostPort: port.Port(),
+								},
+							},
+						},
+					},
+				},
+			}, nil
+		},
+		MappedPortImpl: func(_ context.Context, _ nat.Port) (nat.Port, error) {
+			return port, nil
+		},
+		StateImpl: func(_ context.Context) (*types.ContainerState, error) {
+			return &types.ContainerState{
+				Running: true,
+			}, nil
+		},
+		ExecImpl: func(_ context.Context, _ []string, _ ...exec.ProcessOption) (int, io.Reader, error) {
+			// This is the error that would be returned if the shell is not found.
+			return exitCmdNotFound, nil, nil
+		},
+	}
+
+	wg := NewHostPortStrategy("80").
+		WithStartupTimeout(5 * time.Second).
+		WithPollInterval(100 * time.Millisecond)
+
+	err = wg.WaitUntilReady(context.Background(), target)
+	require.NoError(t, err)
+}