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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request enhances the stability of the Myers diff algorithm by introducing targeted tests. These tests are designed to reproduce and confirm specific panic conditions that were previously reported, thereby validating that the algorithm handles these edge cases gracefully and prevents future regressions related to these panics. Highlights
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Code Review
This pull request adds two regression tests for previously identified panics in the Myers diff linear space algorithm. The tests correctly force the linear space algorithm path and assert that no error (or panic) occurs. My feedback includes a suggestion to refactor the new test function to use a table-driven approach, which is a common Go idiom that improves maintainability.
| func TestLinearSpacePanics(t *testing.T) { | ||
| // 1. x/y clamping panic | ||
| t.Run("xy clamping panic", func(t *testing.T) { | ||
| a := []string{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K"} | ||
| b := []string{"X", "Y", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "Z"} | ||
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| _, err := myers.DiffStrings(a, b, | ||
| myers.WithLinearSpace(true), | ||
| myers.WithSmallInputThreshold(0), | ||
| ) | ||
| assert.NoError(t, err) | ||
| }) | ||
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| // 2. prefix/suffix limit panic | ||
| t.Run("prefix suffix limit panic", func(t *testing.T) { | ||
| a := []string{"X", "X", "X", "X", "X", "X", "X", "X", "X", "X", "X"} | ||
| b := []string{"X", "X", "X", "X", "X", "X", "X", "X", "X", "X"} | ||
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| _, err := myers.DiffStrings(a, b, | ||
| myers.WithLinearSpace(true), | ||
| myers.WithSmallInputThreshold(0), | ||
| ) | ||
| assert.NoError(t, err) | ||
| }) | ||
| } |
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For better maintainability and to follow common Go testing patterns, consider refactoring this test to be table-driven. This makes it easier to add more panic-related test cases in the future.
func TestLinearSpacePanics(t *testing.T) {
tests := []struct {
name string
a []string
b []string
}{
{
name: "xy clamping panic",
a: []string{"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K"},
b: []string{"X", "Y", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "Z"},
},
{
name: "prefix suffix limit panic",
a: []string{"X", "X", "X", "X", "X", "X", "X", "X", "X", "X", "X"},
b: []string{"X", "X", "X", "X", "X", "X", "X", "X", "X", "X"},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
_, err := myers.DiffStrings(tt.a, tt.b,
myers.WithLinearSpace(true),
myers.WithSmallInputThreshold(0),
)
assert.NoError(t, err)
})
}
}
2 participants
Add two tests that confirm the panics revealed in #44 (9d6d18c).