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main_test.go

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package main

import (

"strings"

"testing"

)

func TestHunkToString(t *testing.T) {

tests := []struct {

name string

hunk hunk

expected string

}{

{

name: "Simple Hunk",

hunk: hunk{

preImage: lineIndex{

start: 10,

linesIncluded: 5,

},

postImage: lineIndex{

start: 20,

linesIncluded: 5,

},

content: "-old line\n+new line",

},

expected: "@@ -10,5 +20,5 @@\n-old line\n+new line",

},

{

name: "Empty Content",

hunk: hunk{

preImage: lineIndex{

start: 30,

linesIncluded: 0,

},

postImage: lineIndex{

start: 40,

linesIncluded: 0,

},

content: "",

},

expected: "@@ -30,0 +40,0 @@\n",

},

{

name: "Multi-line Content",

hunk: hunk{

preImage: lineIndex{

start: 1,

linesIncluded: 3,

},

postImage: lineIndex{

start: 4,

linesIncluded: 3,

},

content: "-line 1\n-line 2\n+line 3\n+line 4",

},

expected: "@@ -1,3 +4,3 @@\n-line 1\n-line 2\n+line 3\n+line 4",

},

}

for _, tt := range tests {

t.Run(tt.name, func(t *testing.T) {

result := tt.hunk.Str()

if result != tt.expected {

t.Errorf("Hunk.ToString() = %v, expected %v", result, tt.expected)

}

})

}

}

func TestSplitHunks(t *testing.T) {

input := `diff --git a/file.txt b/file.txt

index abcdef1..1234567 100644

--- a/file.txt

+++ b/file.txt

@@ -1,4 +1,4 @@

Line 1

Line 2

Line 3

-Line 4

+Line 4 modified

`

expectedResult := []hunk{{

preImage: lineIndex{

start: 1,

linesIncluded: 4,

},

postImage: lineIndex{

start: 1,

linesIncluded: 4,

},

header: `diff --git a/file.txt b/file.txt

index abcdef1..1234567 100644

--- a/file.txt

+++ b/file.txt`,

content: ` Line 1

Line 2

Line 3

-Line 4

+Line 4 modified`},

}

result := SplitHunks(input)

if len(result) != len(expectedResult) {

t.Errorf("wrong result %+v for output %+v", result, input)

}

for i, s := range expectedResult {

if s != result[i] {

t.Errorf("wrong output at index %d was \n %+v but should be \n %+v",

i, result[i], s)

}

}

}

func DebugString(content string) string {

spaces := strings.ReplaceAll(content, " ", "_")

res := strings.ReplaceAll(spaces, "\n", "\\n")

return res

}