Fix broken test in go 1.15

cmd/query/app/query_parser_test.go

@@ -16,7 +16,9 @@
 package app
 
 import (
+	"fmt"
 	"net/http"
+	"strings"
 	"testing"
 	"time"
 
@@ -41,8 +43,8 @@ func TestParseTraceQuery(t *testing.T) {
 		{"x?service=service&start=string", errParseInt, nil},
 		{"x?service=service&end=string", errParseInt, nil},
 		{"x?service=service&limit=string", errParseInt, nil},
-		{"x?service=service&start=0&end=0&operation=operation&limit=200&minDuration=20", "cannot not parse minDuration: time: missing unit in duration 20", nil},
-		{"x?service=service&start=0&end=0&operation=operation&limit=200&minDuration=20s&maxDuration=30", "cannot not parse maxDuration: time: missing unit in duration 30", nil},
+		{"x?service=service&start=0&end=0&operation=operation&limit=200&minDuration=20", "cannot not parse minDuration: time: missing unit in duration", nil},
+		{"x?service=service&start=0&end=0&operation=operation&limit=200&minDuration=20s&maxDuration=30", "cannot not parse maxDuration: time: missing unit in duration", nil},
 		{"x?service=service&start=0&end=0&operation=operation&limit=200&tag=k:v&tag=x:y&tag=k&log=k:v&log=k", `malformed 'tag' parameter, expecting key:value, received: k`, nil},
 		{"x?service=service&start=0&end=0&operation=operation&limit=200&minDuration=25s&maxDuration=1s", `'maxDuration' should be greater than 'minDuration'`, nil},
 		{"x?service=service&start=0&end=0&operation=operation&limit=200&tag=k:v&tag=x:y", noErr,
@@ -161,7 +163,7 @@ func TestParseTraceQuery(t *testing.T) {
 					}
 				}
 			} else {
-				assert.EqualError(t, err, test.errMsg)
+				assert.True(t, strings.HasPrefix(err.Error(), test.errMsg), fmt.Sprintf("Error \"%s\" should start with \"%s\"", err.Error(), test.errMsg))
 			}
 		})
 	}