add tiny test start/end time validation (#1549)

Author: Tofel

wasp/benchspy/basic.go

@@ -121,6 +121,13 @@ func (b *BasicData) Validate() error {
 		return errors.New("test end time is missing. We cannot query Loki without a time range. Please set it and try again")
 	}
 
+	if b.TestEnd.Before(b.TestStart) {
+		return errors.New("test end time is before test start time. Please set valid times and try again")
+	}
+	if b.TestEnd.Sub(b.TestStart) < time.Second {
+		return errors.New("test duration is less than a second. Please set a valid time range and try again")
+	}
+
 	if len(b.GeneratorConfigs) == 0 {
 		return errors.New("generator configs are missing. At least one is required. Please set them and try again")
 	}

wasp/benchspy/basic_test.go

@@ -277,6 +277,33 @@ func TestBenchSpy_TestBasicData_Validate(t *testing.T) {
 			wantErr: true,
 			errMsg:  "generator configs are missing",
 		},
+		{
+			name: "test start and end time are the same",
+			bd: &BasicData{
+				TestStart: time.Now(),
+				TestEnd:   time.Now(),
+			},
+			wantErr: true,
+			errMsg:  "test duration is less than a second",
+		},
+		{
+			name: "test end time before start time",
+			bd: &BasicData{
+				TestStart: time.Now().Add(time.Hour),
+				TestEnd:   time.Now(),
+			},
+			wantErr: true,
+			errMsg:  "test end time is before test start time",
+		},
+		{
+			name: "test end time are start time < 1s apart",
+			bd: &BasicData{
+				TestStart: time.Now(),
+				TestEnd:   time.Now().Add(time.Second - time.Millisecond),
+			},
+			wantErr: true,
+			errMsg:  "test duration is less than a second",
+		},
 	}
 
 	for _, tt := range tests {