tests: add logs to KPI integration test

test/integration/test_kongplugininstallation.go

@@ -1,6 +1,7 @@
 package integration
 
 import (
+	"bytes"
 	"fmt"
 	"net/http"
 	"strings"
@@ -368,7 +369,9 @@ func verifyCustomPlugins(t *testing.T, ip string, expectedHeaders ...http.Header
 	httpClient, err := helpers.CreateHTTPClient(nil, "")
 	require.NoError(t, err)
 	require.EventuallyWithT(t, func(c *assert.CollectT) {
-		resp, err := httpClient.Get(fmt.Sprintf("http://%s/test", ip))
+		u := fmt.Sprintf("http://%s/test", ip)
+		t.Logf("verifying connectivity to the HTTPRoute at %s", u)
+		resp, err := httpClient.Get(u)
 		if !assert.NoError(c, err) {
 			return
 		}
@@ -378,10 +381,18 @@ func verifyCustomPlugins(t *testing.T, ip string, expectedHeaders ...http.Header
 		}
 		for _, h := range expectedHeaders {
 			for k, v := range h {
-				assert.Equal(c, v, resp.Header.Values(k))
+				actualV := resp.Header.Values(k)
+				if !assert.Equal(c, v, actualV,
+					"expected header %s to be %s but it was %s", k, v, actualV,
+				) {
+					var b bytes.Buffer
+					_, err := b.ReadFrom(resp.Body)
+					require.NoError(t, err)
+					t.Logf("response body: %s", b.String())
+				}
 			}
 		}
-	}, 15*time.Second, time.Second)
+	}, time.Minute, 250*time.Millisecond)
 }
 
 func createRandomNamespace(t *testing.T) string {