test(challenge1): Enhance test coverage for stats

challenge1/stats_test.go

@@ -0,0 +1,27 @@
+
+package main
+
+import "testing"
+
+func TestFormatStats(t *testing.T) {
+	cases := []struct {
+		Description   string
+		InputStats    stats
+		InputFilename string
+		Want          string
+	}{
+		{"Empty", stats{bytes: 0, words: 0, lines: 0, chars: 0}, "", "0\t0\t0\t"},
+		{"Default", stats{bytes: 11, words: 2, lines: 1, chars: 0}, "filename", "1\t2\t11\tfilename"},
+		{"Chars", stats{bytes: 0, words: 0, lines: 0, chars: 100}, "filename", "100\tfilename"},
+	}
+
+	for _, test := range cases {
+		t.Run(test.Description, func(t *testing.T) {
+			got := formatStats(true, true, true, true, test.InputStats, test.InputFilename)
+
+			if got != test.Want {
+				t.Errorf("got %v, want %v", got, test.Want)
+			}
+		})
+	}
+}