Dynamic Configuration Refactoring

server/middleware/middlewares_test.go

@@ -0,0 +1,127 @@
+package middleware
+
+import (
+	"context"
+	"net/http"
+	"testing"
+
+	"github.com/containous/traefik/config"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMiddlewaresRegistry_BuildMiddlewareCircuitBreaker(t *testing.T) {
+	testConfig := map[string]*config.Middleware{
+		"empty": {
+			CircuitBreaker: &config.CircuitBreaker{
+				Expression: "",
+			},
+		},
+		"foo": {
+			CircuitBreaker: &config.CircuitBreaker{
+				Expression: "NetworkErrorRatio() > 0.5",
+			},
+		},
+	}
+	middlewaresBuilder := NewBuilder(testConfig, nil)
+
+	emptyHandler := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {})
+
+	testCases := []struct {
+		desc          string
+		middlewareID  string
+		expectedError bool
+	}{
+		{
+			desc:          "Should fail at creating a circuit breaker with an empty expression",
+			expectedError: true,
+			middlewareID:  "empty",
+		}, {
+			desc:          "Should create a circuit breaker with a valid expression",
+			expectedError: false,
+			middlewareID:  "foo",
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+			constructor, err := middlewaresBuilder.buildConstructor(context.Background(), test.middlewareID, *testConfig[test.middlewareID])
+			require.NoError(t, err)
+
+			middleware, err2 := constructor(emptyHandler)
+
+			if test.expectedError {
+				require.Error(t, err2)
+			} else {
+				require.NoError(t, err)
+				require.NotNil(t, middleware)
+			}
+		})
+	}
+}
+
+func TestMiddlewaresRegistry_BuildChainNilConfig(t *testing.T) {
+	testConfig := map[string]*config.Middleware{
+		"empty": {},
+	}
+	middlewaresBuilder := NewBuilder(testConfig, nil)
+
+	chain, err := middlewaresBuilder.BuildChain(context.Background(), []string{"empty"})
+	require.NoError(t, err)
+
+	_, err = chain.Then(nil)
+	require.NoError(t, err)
+}
+
+func TestMiddlewaresRegistry_BuildMiddlewareAddPrefix(t *testing.T) {
+	testConfig := map[string]*config.Middleware{
+		"empty": {
+			AddPrefix: &config.AddPrefix{
+				Prefix: "",
+			},
+		},
+		"foo": {
+			AddPrefix: &config.AddPrefix{
+				Prefix: "foo/",
+			},
+		},
+	}
+
+	middlewaresBuilder := NewBuilder(testConfig, nil)
+
+	testCases := []struct {
+		desc          string
+		middlewareID  string
+		expectedError bool
+	}{
+		{
+			desc:          "Should not create an emty AddPrefix middleware when given an empty prefix",
+			middlewareID:  "empty",
+			expectedError: true,
+		}, {
+			desc:          "Should create an AddPrefix middleware when given a valid configuration",
+			middlewareID:  "foo",
+			expectedError: false,
+		},
+	}
+
+	for _, test := range testCases {
+		test := test
+		t.Run(test.desc, func(t *testing.T) {
+			t.Parallel()
+
+			constructor, err := middlewaresBuilder.buildConstructor(context.Background(), test.middlewareID, *testConfig[test.middlewareID])
+			require.NoError(t, err)
+
+			middleware, err2 := constructor(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {}))
+
+			if test.expectedError {
+				require.Error(t, err2)
+			} else {
+				require.NoError(t, err)
+				require.NotNil(t, middleware)
+			}
+		})
+	}
+}