Gim/internal/editor/integration_yank_test.go
Hayden Hargreaves e362c9f118
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Run Test Suite / test (push) Successful in 56s
feat: gap buffer is implemented, tested
Not sure if this is perfect, but it seems to be working
2026-04-02 12:39:30 -07:00

1287 lines
38 KiB
Go

package editor
import (
"strings"
"testing"
"git.gophernest.net/azpect/TextEditor/internal/core"
)
// =============================================================================
// yy (Yank Line / DoublePress) Tests
// =============================================================================
func TestYankLineBasic(t *testing.T) {
t.Run("yy yanks current line to register", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.LinewiseRegister {
t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
}
if len(reg.Content) != 1 {
t.Errorf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "line 1" {
t.Errorf("register content[0] = %q, want 'line 1'", reg.Content[0])
}
})
t.Run("yy does not modify buffer", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 3 {
t.Errorf("LineCount() = %d, want 3", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[0].String() != "line 1" {
t.Errorf("Line(0) = %q, want 'line 1'", m.ActiveBuffer().Lines[0].String())
}
if m.ActiveBuffer().Lines[1].String() != "line 2" {
t.Errorf("Line(1) = %q, want 'line 2'", m.ActiveBuffer().Lines[1].String())
}
if m.ActiveBuffer().Lines[2].String() != "line 3" {
t.Errorf("Line(2) = %q, want 'line 3'", m.ActiveBuffer().Lines[2].String())
}
})
t.Run("yy does not move cursor", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 1, Col: 3}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
if m.ActiveWindow().Cursor.Line != 1 {
t.Errorf("CursorY() = %d, want 1", m.ActiveWindow().Cursor.Line)
}
if m.ActiveWindow().Cursor.Col != 3 {
t.Errorf("CursorX() = %d, want 3", m.ActiveWindow().Cursor.Col)
}
})
t.Run("yy from middle of file", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"first", "second", "third", "fourth"}),
WithCursorPos(core.Position{Line: 2, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if reg.Content[0] != "third" {
t.Errorf("register content[0] = %q, want 'third'", reg.Content[0])
}
})
t.Run("yy at last line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "last line"}),
WithCursorPos(core.Position{Line: 2, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if reg.Content[0] != "last line" {
t.Errorf("register content[0] = %q, want 'last line'", reg.Content[0])
}
})
}
func TestYankLineWithCount(t *testing.T) {
t.Run("2yy yanks two lines", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3", "line 4"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "2", "y", "y")
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if len(reg.Content) != 2 {
t.Errorf("register content length = %d, want 2", len(reg.Content))
}
if reg.Content[0] != "line 1" {
t.Errorf("register content[0] = %q, want 'line 1'", reg.Content[0])
}
if reg.Content[1] != "line 2" {
t.Errorf("register content[1] = %q, want 'line 2'", reg.Content[1])
}
})
t.Run("3yy yanks three lines", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"a", "b", "c", "d", "e"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "3", "y", "y")
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if len(reg.Content) != 3 {
t.Errorf("register content length = %d, want 3", len(reg.Content))
}
if reg.Content[0] != "b" {
t.Errorf("register content[0] = %q, want 'b'", reg.Content[0])
}
if reg.Content[1] != "c" {
t.Errorf("register content[1] = %q, want 'c'", reg.Content[1])
}
if reg.Content[2] != "d" {
t.Errorf("register content[2] = %q, want 'd'", reg.Content[2])
}
})
t.Run("yy with count overflow clamps to available lines", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "1", "0", "y", "y") // 10yy but only 2 lines available
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if len(reg.Content) != 2 {
t.Errorf("register content length = %d, want 2 (clamped)", len(reg.Content))
}
if reg.Content[0] != "line 2" {
t.Errorf("register content[0] = %q, want 'line 2'", reg.Content[0])
}
if reg.Content[1] != "line 3" {
t.Errorf("register content[1] = %q, want 'line 3'", reg.Content[1])
}
})
t.Run("yy with count does not modify buffer", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "3", "y", "y")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 3 {
t.Errorf("LineCount() = %d, want 3", m.ActiveBuffer().LineCount())
}
})
}
func TestYankLineEdgeCases(t *testing.T) {
t.Run("yy on empty line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "", "line 3"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if len(reg.Content) != 1 {
t.Errorf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "" {
t.Errorf("register content[0] = %q, want ''", reg.Content[0])
}
})
t.Run("yy on single line buffer", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"only line"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if reg.Content[0] != "only line" {
t.Errorf("register content[0] = %q, want 'only line'", reg.Content[0])
}
})
t.Run("yy preserves whitespace", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{" indented", "\ttabbed", " spaces "}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "3", "y", "y")
m := getFinalModel(t, tm)
reg, _ := m.GetRegister('"')
if reg.Content[0] != " indented" {
t.Errorf("register content[0] = %q, want ' indented'", reg.Content[0])
}
if reg.Content[1] != "\ttabbed" {
t.Errorf("register content[1] = %q, want '\\ttabbed'", reg.Content[1])
}
if reg.Content[2] != " spaces " {
t.Errorf("register content[2] = %q, want ' spaces '", reg.Content[2])
}
})
}
// =============================================================================
// Yank with Linewise Motions (yj, yk, yG, ygg) - TDD Tests
// =============================================================================
func TestYankWithLinewiseMotions(t *testing.T) {
t.Run("yj yanks current line and line below", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "j")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.LinewiseRegister {
t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
}
if len(reg.Content) != 2 {
t.Fatalf("register content length = %d, want 2", len(reg.Content))
}
if reg.Content[0] != "line 1" {
t.Errorf("register content[0] = %q, want 'line 1'", reg.Content[0])
}
if reg.Content[1] != "line 2" {
t.Errorf("register content[1] = %q, want 'line 2'", reg.Content[1])
}
})
t.Run("yk yanks current line and line above", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "k")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.LinewiseRegister {
t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
}
if len(reg.Content) != 2 {
t.Fatalf("register content length = %d, want 2", len(reg.Content))
}
if reg.Content[0] != "line 1" {
t.Errorf("register content[0] = %q, want 'line 1'", reg.Content[0])
}
if reg.Content[1] != "line 2" {
t.Errorf("register content[1] = %q, want 'line 2'", reg.Content[1])
}
})
t.Run("yG yanks from cursor to end of file", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3", "line 4"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "G")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.LinewiseRegister {
t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
}
if len(reg.Content) != 3 {
t.Fatalf("register content length = %d, want 3", len(reg.Content))
}
if reg.Content[0] != "line 2" {
t.Errorf("register content[0] = %q, want 'line 2'", reg.Content[0])
}
if reg.Content[2] != "line 4" {
t.Errorf("register content[2] = %q, want 'line 4'", reg.Content[2])
}
})
t.Run("ygg yanks from cursor to beginning of file", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3", "line 4"}),
WithCursorPos(core.Position{Line: 2, Col: 0}),
)
sendKeys(tm, "y", "g", "g")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.LinewiseRegister {
t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
}
if len(reg.Content) != 3 {
t.Fatalf("register content length = %d, want 3", len(reg.Content))
}
if reg.Content[0] != "line 1" {
t.Errorf("register content[0] = %q, want 'line 1'", reg.Content[0])
}
if reg.Content[2] != "line 3" {
t.Errorf("register content[2] = %q, want 'line 3'", reg.Content[2])
}
})
t.Run("y2j yanks current and next two lines", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"a", "b", "c", "d", "e"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "2", "j")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(reg.Content) != 3 {
t.Fatalf("register content length = %d, want 3", len(reg.Content))
}
if reg.Content[0] != "b" {
t.Errorf("register content[0] = %q, want 'b'", reg.Content[0])
}
if reg.Content[1] != "c" {
t.Errorf("register content[1] = %q, want 'c'", reg.Content[1])
}
if reg.Content[2] != "d" {
t.Errorf("register content[2] = %q, want 'd'", reg.Content[2])
}
})
t.Run("yj does not move cursor", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 3}),
)
sendKeys(tm, "y", "j")
m := getFinalModel(t, tm)
if m.ActiveWindow().Cursor.Line != 0 {
t.Errorf("CursorY() = %d, want 0", m.ActiveWindow().Cursor.Line)
}
})
t.Run("yG does not modify buffer", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "G")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 3 {
t.Errorf("LineCount() = %d, want 3", m.ActiveBuffer().LineCount())
}
})
}
// =============================================================================
// Yank with Charwise Motions (yw, ye, yb, y$, y0) - TDD Tests
// =============================================================================
func TestYankWithCharwiseMotions(t *testing.T) {
t.Run("yw yanks word under cursor", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "w")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
// yw includes trailing space
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "hello " {
t.Errorf("register content = %q, want 'hello '", reg.Content[0])
}
})
t.Run("ye yanks to end of word (exclusive)", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "e")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
// ye is inclusive of last char
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "hello" {
t.Errorf("register content = %q, want 'hello'", reg.Content[0])
}
})
t.Run("yb yanks backward word", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 6}), // on 'w'
)
sendKeys(tm, "y", "b")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
// yb from 'w' back to start of 'hello'
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "hello " {
t.Errorf("register content = %q, want 'hello '", reg.Content[0])
}
})
t.Run("y$ yanks to end of line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 6}), // on 'w'
)
sendKeys(tm, "y", "$")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "world" {
t.Errorf("register content = %q, want 'world'", reg.Content[0])
}
})
t.Run("y0 yanks to beginning of line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 6}), // on 'w'
)
sendKeys(tm, "y", "0")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "hello " {
t.Errorf("register content = %q, want 'hello '", reg.Content[0])
}
})
t.Run("y_ yanks to first non-whitespace", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{" hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 10}), // on 'w'
)
sendKeys(tm, "y", "_")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
// From 'w' back to 'h' (first non-ws)
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "hello " {
t.Errorf("register content = %q, want 'hello '", reg.Content[0])
}
})
t.Run("y2w yanks two words", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"one two three four"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "2", "w")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "one two " {
t.Errorf("register content = %q, want 'one two '", reg.Content[0])
}
})
t.Run("yw does not move cursor", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "w")
m := getFinalModel(t, tm)
if m.ActiveWindow().Cursor.Col != 0 {
t.Errorf("CursorX() = %d, want 0", m.ActiveWindow().Cursor.Col)
}
})
t.Run("yw does not modify buffer", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "w")
m := getFinalModel(t, tm)
if m.ActiveBuffer().Lines[0].String() != "hello world" {
t.Errorf("Line(0) = %q, want 'hello world'", m.ActiveBuffer().Lines[0].String())
}
})
}
// =============================================================================
// Visual Mode Yank Tests - TDD Tests
// =============================================================================
func TestYankVisualCharwise(t *testing.T) {
t.Run("v selection then y yanks selected text", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "v", "l", "l", "l", "l", "y") // select "hello"
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "hello" {
t.Errorf("register content = %q, want 'hello'", reg.Content[0])
}
})
t.Run("v selection across lines yanks with newlines", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2"}),
WithCursorPos(core.Position{Line: 0, Col: 3}),
)
sendKeys(tm, "v", "j", "l", "l", "y") // select "e 1\nlin"
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.CharwiseRegister {
t.Errorf("register type = %v, want CharwiseRegister", reg.Type)
}
// Multi-line charwise yank
if len(reg.Content) < 1 {
t.Fatal("register content empty, expected multi-line selection")
}
})
t.Run("visual yank exits visual mode", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "v", "l", "l", "y")
m := getFinalModel(t, tm)
if m.Mode() != core.NormalMode {
t.Errorf("Mode() = %v, want NormalMode", m.Mode())
}
})
t.Run("visual yank does not modify buffer", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "v", "l", "l", "l", "l", "y")
m := getFinalModel(t, tm)
if m.ActiveBuffer().Lines[0].String() != "hello world" {
t.Errorf("Line(0) = %q, want 'hello world'", m.ActiveBuffer().Lines[0].String())
}
})
}
func TestYankVisualLinewise(t *testing.T) {
t.Run("V selection then y yanks entire lines", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "V", "j", "y") // select lines 1 and 2
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.LinewiseRegister {
t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
}
if len(reg.Content) != 2 {
t.Fatalf("register content length = %d, want 2", len(reg.Content))
}
if reg.Content[0] != "line 1" {
t.Errorf("register content[0] = %q, want 'line 1'", reg.Content[0])
}
if reg.Content[1] != "line 2" {
t.Errorf("register content[1] = %q, want 'line 2'", reg.Content[1])
}
})
t.Run("V on single line then y yanks that line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "V", "y")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.LinewiseRegister {
t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
}
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "line 1" {
t.Errorf("register content[0] = %q, want 'line 1'", reg.Content[0])
}
})
t.Run("V selection upward yanks in correct order", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 2, Col: 0}),
)
sendKeys(tm, "V", "k", "y") // select from line 3 upward to line 2
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(reg.Content) != 2 {
t.Fatalf("register content length = %d, want 2", len(reg.Content))
}
// Order should be top-to-bottom regardless of selection direction
if reg.Content[0] != "line 2" {
t.Errorf("register content[0] = %q, want 'line 2'", reg.Content[0])
}
if reg.Content[1] != "line 3" {
t.Errorf("register content[1] = %q, want 'line 3'", reg.Content[1])
}
})
t.Run("visual line yank exits visual mode", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "V", "y")
m := getFinalModel(t, tm)
if m.Mode() != core.NormalMode {
t.Errorf("Mode() = %v, want NormalMode", m.Mode())
}
})
}
func TestYankVisualBlock(t *testing.T) {
t.Run("ctrl+v selection then y yanks block", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"abcdef", "ghijkl", "mnopqr"}),
WithCursorPos(core.Position{Line: 0, Col: 1}),
)
sendKeys(tm, "ctrl+v", "j", "j", "l", "l", "y") // select 3x3 block starting at col 1
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if reg.Type != core.BlockwiseRegister {
t.Errorf("register type = %v, want BlockwiseRegister", reg.Type)
}
// Block should contain "bcd", "hij", "nop"
if len(reg.Content) != 3 {
t.Fatalf("register content length = %d, want 3", len(reg.Content))
}
if reg.Content[0] != "bcd" {
t.Errorf("register content[0] = %q, want 'bcd'", reg.Content[0])
}
if reg.Content[1] != "hij" {
t.Errorf("register content[1] = %q, want 'hij'", reg.Content[1])
}
if reg.Content[2] != "nop" {
t.Errorf("register content[2] = %q, want 'nop'", reg.Content[2])
}
})
t.Run("visual block yank exits visual mode", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"abcd", "efgh"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "ctrl+v", "j", "l", "y")
m := getFinalModel(t, tm)
if m.Mode() != core.NormalMode {
t.Errorf("Mode() = %v, want NormalMode", m.Mode())
}
})
t.Run("visual block yank with uneven line lengths", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"abcdefgh", "ij", "klmnop"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "ctrl+v", "j", "j", "l", "l", "l", "y") // 4-wide block
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
// Short line should be padded or truncated based on implementation
if len(reg.Content) != 3 {
t.Fatalf("register content length = %d, want 3", len(reg.Content))
}
})
}
// =============================================================================
// Register Behavior Tests
// =============================================================================
func TestYankRegisterBehavior(t *testing.T) {
t.Run("yy updates register 0 and unnamed register", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
// Check unnamed register
unnamed, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(unnamed.Content) == 0 {
t.Fatal("unnamed register is empty")
}
if unnamed.Content[0] != "line 1" {
t.Errorf("unnamed register = %q, want 'line 1'", unnamed.Content[0])
}
// Check register 0
reg0, ok := m.GetRegister('0')
if !ok {
t.Fatal("register 0 not found")
}
if len(reg0.Content) == 0 {
t.Fatal("register 0 is empty")
}
if reg0.Content[0] != "line 1" {
t.Errorf("register 0 = %q, want 'line 1'", reg0.Content[0])
}
})
t.Run("multiple yanks shift numbered registers", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"first", "second", "third"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "y") // yank "first"
sendKeys(tm, "j")
sendKeys(tm, "y", "y") // yank "second"
m := getFinalModel(t, tm)
// Most recent yank should be in 0 and unnamed
reg0, ok := m.GetRegister('0')
if !ok {
t.Fatal("register 0 not found")
}
if len(reg0.Content) == 0 {
t.Fatal("register 0 is empty")
}
if reg0.Content[0] != "second" {
t.Errorf("register 0 = %q, want 'second'", reg0.Content[0])
}
// Previous yank should shift to register 1
reg1, ok := m.GetRegister('1')
if !ok {
t.Fatal("register 1 not found")
}
if len(reg1.Content) == 0 {
t.Fatal("register 1 is empty")
}
if reg1.Content[0] != "first" {
t.Errorf("register 1 = %q, want 'first'", reg1.Content[0])
}
})
t.Run("yank then paste uses correct content", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"original", "to copy"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "y") // yank "to copy"
sendKeys(tm, "k") // move up
sendKeys(tm, "p") // paste
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 3 {
t.Errorf("LineCount() = %d, want 3", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[1].String() != "to copy" {
t.Errorf("Line(1) = %q, want 'to copy'", m.ActiveBuffer().Lines[1].String())
}
})
}
// =============================================================================
// Edge Cases and Special Scenarios
// =============================================================================
func TestYankEdgeCases(t *testing.T) {
t.Run("yy on whitespace-only line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", " ", "line 3"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(reg.Content) == 0 {
t.Fatal("register is empty")
}
if reg.Content[0] != " " {
t.Errorf("register content = %q, want ' '", reg.Content[0])
}
})
t.Run("yw at end of line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello"}),
WithCursorPos(core.Position{Line: 0, Col: 4}), // on 'o'
)
sendKeys(tm, "y", "w")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
// At end of line, yw should yank just the last character
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "o" {
t.Errorf("register content = %q, want 'o'", reg.Content[0])
}
})
t.Run("y$ at beginning of line yanks entire line content", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "$")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "hello world" {
t.Errorf("register content = %q, want 'hello world'", reg.Content[0])
}
})
t.Run("y0 at beginning of line yanks nothing", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "0")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
// At col 0, y0 should yank empty string
if len(reg.Content) != 1 {
t.Fatalf("register content length = %d, want 1", len(reg.Content))
}
if reg.Content[0] != "" {
t.Errorf("register content = %q, want ''", reg.Content[0])
}
})
t.Run("yy on very long line", func(t *testing.T) {
longLine := strings.Repeat("a", 1000)
tm := newTestModel(t,
WithLines([]string{longLine}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(reg.Content) == 0 {
t.Fatal("register is empty")
}
if len(reg.Content[0]) != 1000 {
t.Errorf("register content length = %d, want 1000", len(reg.Content[0]))
}
})
t.Run("yy with special characters", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello\tworld", "foo\nbar"}), // tab and embedded newline
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "y")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
if len(reg.Content) == 0 {
t.Fatal("register is empty")
}
if reg.Content[0] != "hello\tworld" {
t.Errorf("register content = %q, want 'hello\\tworld'", reg.Content[0])
}
})
}
// =============================================================================
// Visual Yank → Paste Round-Trip Tests
// =============================================================================
func TestVisualYankPasteRoundTrip(t *testing.T) {
t.Run("visual charwise yank then paste single line", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
// Select "hello", yank it, move to end, paste
sendKeys(tm, "v", "l", "l", "l", "l", "y", "$", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().Lines[0].String() != "hello worldhello" {
t.Errorf("Line(0) = %q, want 'hello worldhello'", m.ActiveBuffer().Lines[0].String())
}
})
t.Run("visual charwise yank then paste before", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 6}), // on 'w'
)
// Select "world", yank it, go to start, paste before
sendKeys(tm, "v", "$", "y", "0", "P")
m := getFinalModel(t, tm)
if m.ActiveBuffer().Lines[0].String() != "worldhello world" {
t.Errorf("Line(0) = %q, want 'worldhello world'", m.ActiveBuffer().Lines[0].String())
}
})
t.Run("visual line yank then paste", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
// V yank line 1, go to line 2, paste
sendKeys(tm, "V", "y", "j", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 4 {
t.Errorf("LineCount() = %d, want 4", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[2].String() != "line 1" {
t.Errorf("Line(2) = %q, want 'line 1'", m.ActiveBuffer().Lines[2].String())
}
})
t.Run("visual line yank multiple lines then paste", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3", "line 4"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
// V select lines 1-2, yank, go to end, paste
sendKeys(tm, "V", "j", "y", "G", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 6 {
t.Errorf("LineCount() = %d, want 6", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[4].String() != "line 1" {
t.Errorf("Line(4) = %q, want 'line 1'", m.ActiveBuffer().Lines[4].String())
}
if m.ActiveBuffer().Lines[5].String() != "line 2" {
t.Errorf("Line(5) = %q, want 'line 2'", m.ActiveBuffer().Lines[5].String())
}
})
t.Run("visual line yank then paste before", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 2, Col: 0}),
)
// V yank line 3, go to line 1, paste before
sendKeys(tm, "V", "y", "g", "g", "P")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 4 {
t.Errorf("LineCount() = %d, want 4", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[0].String() != "line 3" {
t.Errorf("Line(0) = %q, want 'line 3'", m.ActiveBuffer().Lines[0].String())
}
if m.ActiveBuffer().Lines[1].String() != "line 1" {
t.Errorf("Line(1) = %q, want 'line 1'", m.ActiveBuffer().Lines[1].String())
}
})
t.Run("yy then p duplicates line below", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"original", "other"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
sendKeys(tm, "y", "y", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 3 {
t.Errorf("LineCount() = %d, want 3", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[0].String() != "original" {
t.Errorf("Line(0) = %q, want 'original'", m.ActiveBuffer().Lines[0].String())
}
if m.ActiveBuffer().Lines[1].String() != "original" {
t.Errorf("Line(1) = %q, want 'original'", m.ActiveBuffer().Lines[1].String())
}
if m.ActiveBuffer().Lines[2].String() != "other" {
t.Errorf("Line(2) = %q, want 'other'", m.ActiveBuffer().Lines[2].String())
}
})
t.Run("yy then P duplicates line above", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"original", "other"}),
WithCursorPos(core.Position{Line: 1, Col: 0}),
)
sendKeys(tm, "y", "y", "P")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 3 {
t.Errorf("LineCount() = %d, want 3", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[0].String() != "original" {
t.Errorf("Line(0) = %q, want 'original'", m.ActiveBuffer().Lines[0].String())
}
if m.ActiveBuffer().Lines[1].String() != "other" {
t.Errorf("Line(1) = %q, want 'other'", m.ActiveBuffer().Lines[1].String())
}
if m.ActiveBuffer().Lines[2].String() != "other" {
t.Errorf("Line(2) = %q, want 'other'", m.ActiveBuffer().Lines[2].String())
}
})
t.Run("yw then p pastes word after cursor", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
// yw yanks "hello ", move to end of world, paste
sendKeys(tm, "y", "w", "$", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().Lines[0].String() != "hello worldhello " {
t.Errorf("Line(0) = %q, want 'hello worldhello '", m.ActiveBuffer().Lines[0].String())
}
})
t.Run("ye then p pastes word after cursor", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello world"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
// ye yanks "hello" (inclusive), move to end of line, paste
sendKeys(tm, "y", "e", "$", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().Lines[0].String() != "hello worldhello" {
t.Errorf("Line(0) = %q, want 'hello worldhello'", m.ActiveBuffer().Lines[0].String())
}
})
t.Run("visual select partial word yank then paste", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"abcdefgh"}),
WithCursorPos(core.Position{Line: 0, Col: 2}), // on 'c'
)
// Select "cde", yank, go to end, paste
sendKeys(tm, "v", "l", "l", "y", "$", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().Lines[0].String() != "abcdefghcde" {
t.Errorf("Line(0) = %q, want 'abcdefghcde'", m.ActiveBuffer().Lines[0].String())
}
})
t.Run("visual yank empty selection does nothing", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"hello"}),
WithCursorPos(core.Position{Line: 0, Col: 2}),
)
// Enter visual mode then immediately yank (single char)
sendKeys(tm, "v", "y")
m := getFinalModel(t, tm)
reg, ok := m.GetRegister('"')
if !ok {
t.Fatal("unnamed register not found")
}
// Should have yanked single char 'l'
if len(reg.Content) != 1 || reg.Content[0] != "l" {
t.Errorf("register content = %q, want 'l'", reg.Content)
}
})
t.Run("dd then p moves deleted line down", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
// dd deletes line 1, p pastes it below cursor (now on line 2)
sendKeys(tm, "d", "d", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 3 {
t.Errorf("LineCount() = %d, want 3", m.ActiveBuffer().LineCount())
}
if m.ActiveBuffer().Lines[0].String() != "line 2" {
t.Errorf("Line(0) = %q, want 'line 2'", m.ActiveBuffer().Lines[0].String())
}
if m.ActiveBuffer().Lines[1].String() != "line 1" {
t.Errorf("Line(1) = %q, want 'line 1'", m.ActiveBuffer().Lines[1].String())
}
if m.ActiveBuffer().Lines[2].String() != "line 3" {
t.Errorf("Line(2) = %q, want 'line 3'", m.ActiveBuffer().Lines[2].String())
}
})
t.Run("2yy then 2p pastes twice", func(t *testing.T) {
tm := newTestModel(t,
WithLines([]string{"line 1", "line 2", "line 3"}),
WithCursorPos(core.Position{Line: 0, Col: 0}),
)
// 2yy yanks lines 1-2, 2p pastes them twice after current line
sendKeys(tm, "2", "y", "y", "2", "p")
m := getFinalModel(t, tm)
if m.ActiveBuffer().LineCount() != 7 {
t.Errorf("LineCount() = %d, want 7", m.ActiveBuffer().LineCount())
}
// Original + 2 copies of 2 lines = 3 + 4 = 7
if m.ActiveBuffer().Lines[1].String() != "line 1" {
t.Errorf("Line(1) = %q, want 'line 1'", m.ActiveBuffer().Lines[1].String())
}
if m.ActiveBuffer().Lines[2].String() != "line 2" {
t.Errorf("Line(2) = %q, want 'line 2'", m.ActiveBuffer().Lines[2].String())
}
if m.ActiveBuffer().Lines[3].String() != "line 1" {
t.Errorf("Line(3) = %q, want 'line 1'", m.ActiveBuffer().Lines[3].String())
}
if m.ActiveBuffer().Lines[4].String() != "line 2" {
t.Errorf("Line(4) = %q, want 'line 2'", m.ActiveBuffer().Lines[4].String())
}
})
}