if err := os.Unsetenv(env); err != nil {
			t.Errorf("couldn't unset env %s: %v", env, err)
		}
	}
}

func TestFallbackToEnv(t *testing.T) {
	testCases := []struct {
		desc          string
		env           string
		value         string
		valueSet      bool
		expectedValue string
		expectedError bool
	}{
		{
			desc:          "value unset",
			env:           "FOO",
			valueSet:      false,

John Howard <******@****.***> 1597787025 -0700

     * the bean class will be used.
     *
     * @return The class loader to load referenced types from or {@code null} if unset.
     */
    ClassLoader getClassLoader();

    /**
     * Sets the class loader from which to load any types referenced by the configuration. If unset, the class loader of
     * the bean class will be used.
     *

    int minimumTableSize = CompactHashing.tableSize(size);
    int mask = hashTableMask();
    if (minimumTableSize < mask) { // smaller table size will always be less than current mask
      resizeTable(mask, minimumTableSize, UNSET, UNSET);
    }
  }

  @Override
  public void clear() {
    if (needsAllocArrays()) {
      return;
    }
    incrementModCount();
    Set<E> delegate = delegateOrNull();

        super.convention(provider);
        return this;
    }

    @Override
    public ListProperty<T> unset() {
        return uncheckedNonnullCast(super.unset());
    }

    @Override
    public ListProperty<T> unsetConvention() {
        return uncheckedNonnullCast(super.unsetConvention());
    }

apiVersion: release-notes/v2
kind: bug-fix
area: traffic-management
releaseNotes:
  - |

// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package main

   * high 32 bits of each long is the "prev" pointer, whereas the low 32 bits is the "succ" pointer
   * (pointing to the nextEntry entry in the linked list). The pointers in [size(), entries.length)
   * are all "null" (UNSET).
   *
   * <p>A node with "prev" pointer equal to {@code ENDPOINT} is the first node in the linked list,
   * and a node with "nextEntry" pointer equal to {@code ENDPOINT} is the last node.
   */

    1. If `values.gateways.istio-ingressgateway.meshExpansionPorts` is set, move all ports to `components.ingressGateways[name=istio-ingressgateway].k8s.service.ports` if they're not already present. Then, unset this value.

	return result
}

// Get retrieves the value of the environment variable.
// It returns the value, which will be the default if the variable is not present.
// To distinguish between an empty value and an unset value, use Lookup.
func (v StringVar) Get() string {
	result, _ := v.Lookup()
	return result
}

// Lookup retrieves the value of the environment variable. If the
// variable is present in the environment the