Add complementary unittest for kubectl logs

pkg/kubectl/cmd/logs_test.go

@@ -111,6 +111,11 @@ func TestValidateLogFlags(t *testing.T) {
 			flags:    map[string]string{"since": "1h", "since-time": "2006-01-02T15:04:05Z"},
 			expected: "at most one of `sinceTime` or `sinceSeconds` may be specified",
 		},
+		{
+			name:     "negative since-time",
+			flags:    map[string]string{"since": "-1s"},
+			expected: "must be greater than 0",
+		},
 		{
 			name:     "negative limit-bytes",
 			flags:    map[string]string{"limit-bytes": "-100"},
@@ -142,3 +147,59 @@ func TestValidateLogFlags(t *testing.T) {
 		}
 	}
 }
+
+func TestLogComplete(t *testing.T) {
+	f, _, _, _ := cmdtesting.NewAPIFactory()
+
+	tests := []struct {
+		name     string
+		args     []string
+		flags    map[string]string
+		expected string
+	}{
+		{
+			name:     "No args case",
+			flags:    map[string]string{"selector": ""},
+			expected: "'logs (POD | TYPE/NAME) [CONTAINER_NAME]'.\nPOD or TYPE/NAME is a required argument for the logs command",
+		},
+		{
+			name:     "One args case",
+			args:     []string{"foo"},
+			flags:    map[string]string{"selector": "foo"},
+			expected: "only a selector (-l) or a POD name is allowed",
+		},
+		{
+			name:     "Two args case",
+			args:     []string{"foo", "foo1"},
+			flags:    map[string]string{"container": "foo1"},
+			expected: "only one of -c or an inline [CONTAINER] arg is allowed",
+		},
+		{
+			name:     "More than two args case",
+			args:     []string{"foo", "foo1", "foo2"},
+			flags:    map[string]string{"tail": "1"},
+			expected: "'logs (POD | TYPE/NAME) [CONTAINER_NAME]'.\nPOD or TYPE/NAME is a required argument for the logs command",
+		},
+		{
+			name:     "follow and selecter conflict",
+			flags:    map[string]string{"selector": "foo", "follow": "true"},
+			expected: "only one of follow (-f) or selector (-l) is allowed",
+		},
+	}
+	for _, test := range tests {
+		cmd := NewCmdLogs(f, bytes.NewBuffer([]byte{}))
+		var err error
+		out := ""
+		for flag, value := range test.flags {
+			cmd.Flags().Set(flag, value)
+		}
+		// checkErr breaks tests in case of errors, plus we just
+		// need to check errors returned by the command validation
+		o := &LogsOptions{}
+		err = o.Complete(f, os.Stdout, cmd, test.args)
+		out = err.Error()
+		if !strings.Contains(out, test.expected) {
+			t.Errorf("%s: expected to find:\n\t%s\nfound:\n\t%s\n", test.name, test.expected, out)
+		}
+	}
+}