Function TestShouldMemoize

pkg/regexp/regexp_test.go:158–196

(t *testing.T)

}

func TestShouldMemoize(t *testing.T) {
	tcs := []struct {
		regex         string
		shouldMemoize bool
	}{
		{
			regex:         ".*",
			shouldMemoize: false,
		},
		{
			regex:         "foo.*",
			shouldMemoize: false,
		},
		{
			regex:         ".*bar",
			shouldMemoize: false,
		},
		{
			regex:         "foo|bar",
			shouldMemoize: false,
		},
		{
			regex:         ".*bar.*", // creates a containsStringMatcher so should not memoize
			shouldMemoize: false,
		},
		{
			regex:         ".*bar.*foo.*", // now uses a stringMatcher in prometheus v0.311.2+
			shouldMemoize: false,
		},
	}

	for _, tc := range tcs {
		t.Run(tc.regex, func(t *testing.T) {
			m, err := labels.NewFastRegexMatcher(tc.regex)
			require.NoError(t, err)
			require.Equal(t, tc.shouldMemoize, shouldMemoize(m))
		})
	}
}