test(diff): add tests for renamed filter and removed alias

Add tests for the --filter=renamed option and the --filter=removed alias
that maps to dropped.

Go tests:
- Tests for filter=renamed checking all diff types
- Tests for "removed" alias mapping to dropped internally
- Verify renamed filter only includes renamed tables

BATS tests:
- Test --filter=renamed with table rename scenario
- Test --filter=dropped with table drop scenario
- Verify --filter=removed alias works same as dropped
- Verify other filters correctly exclude renamed/dropped tables

Refs: #1430

go/cmd/dolt/commands/diff_filter_test.go

@@ -78,7 +78,19 @@ func TestDiffTypeFilter_ShouldInclude(t *testing.T) {
 		// Testing with filter=dropped
 		{"filter=dropped, check added", diff.DiffTypeDropped, diff.DiffTypeAdded, false},
 		{"filter=dropped, check modified", diff.DiffTypeDropped, diff.DiffTypeModified, false},
-		{"filter=dropped, check removed", diff.DiffTypeDropped, diff.DiffTypeDropped, true},
+		{"filter=dropped, check dropped", diff.DiffTypeDropped, diff.DiffTypeDropped, true},
+		{"filter=dropped, check renamed", diff.DiffTypeDropped, diff.DiffTypeRenamed, false},
+
+		// Testing with filter=renamed
+		{"filter=renamed, check added", diff.DiffTypeRenamed, diff.DiffTypeAdded, false},
+		{"filter=renamed, check modified", diff.DiffTypeRenamed, diff.DiffTypeModified, false},
+		{"filter=renamed, check dropped", diff.DiffTypeRenamed, diff.DiffTypeDropped, false},
+		{"filter=renamed, check renamed", diff.DiffTypeRenamed, diff.DiffTypeRenamed, true},
+
+		// Testing with "removed" alias (should map to dropped)
+		{"filter=removed (alias), check dropped", "removed", diff.DiffTypeDropped, true},
+		{"filter=removed (alias), check added", "removed", diff.DiffTypeAdded, false},
+		{"filter=removed (alias), check renamed", "removed", diff.DiffTypeRenamed, false},
 
 		// Testing with filter=all
 		{"filter=all, check added", diff.DiffTypeAll, diff.DiffTypeAdded, true},

integration-tests/bats/diff.bats

@@ -2396,3 +2396,72 @@ EOF
     [ $status -eq 1 ]
     [[ $output =~ "invalid filter" ]] || false
 }
+
+@test "diff: --filter=renamed filters to only renamed tables" {
+    dolt sql -q "create table t(pk int primary key, val int)"
+    dolt sql -q "INSERT INTO t VALUES (1, 10)"
+    dolt add . && dolt commit -m "create table with data"
+
+    # Rename the table
+    dolt sql -q "RENAME TABLE t TO t_renamed"
+    dolt add . && dolt commit -m "rename table"
+
+    # filter=renamed should show the renamed table (shows different from/to names)
+    run dolt diff HEAD~1 --filter=renamed
+    [ $status -eq 0 ]
+    [[ $output =~ 'diff --dolt a/t b/t_renamed' ]] || false
+    [[ $output =~ '--- a/t' ]] || false
+    [[ $output =~ '+++ b/t_renamed' ]] || false
+
+    # filter=added should not show the renamed table
+    run dolt diff HEAD~1 --filter=added
+    [ $status -eq 0 ]
+    [[ $output = '' ]] || false
+
+    # filter=modified should not show the renamed table
+    run dolt diff HEAD~1 --filter=modified
+    [ $status -eq 0 ]
+    [[ $output = '' ]] || false
+
+    # filter=dropped should not show the renamed table
+    run dolt diff HEAD~1 --filter=dropped
+    [ $status -eq 0 ]
+    [[ $output = '' ]] || false
+}
+
+@test "diff: --filter=dropped filters to only dropped tables" {
+    dolt sql -q "create table t(pk int primary key, val int)"
+    dolt sql -q "INSERT INTO t VALUES (1, 10)"
+    dolt add . && dolt commit -m "create table with data"
+
+    # Drop the table
+    dolt sql -q "DROP TABLE t"
+    dolt add . && dolt commit -m "drop table"
+
+    # filter=dropped should show the dropped table
+    run dolt diff HEAD~1 --filter=dropped
+    [ $status -eq 0 ]
+    [[ $output =~ 'diff --dolt a/t b/t' ]] || false
+    [[ $output =~ 'deleted table' ]] || false
+
+    # filter=removed (alias for dropped) should also show the dropped table
+    run dolt diff HEAD~1 --filter=removed
+    [ $status -eq 0 ]
+    [[ $output =~ 'diff --dolt a/t b/t' ]] || false
+    [[ $output =~ 'deleted table' ]] || false
+
+    # filter=added should not show the dropped table
+    run dolt diff HEAD~1 --filter=added
+    [ $status -eq 0 ]
+    [[ $output = '' ]] || false
+
+    # filter=modified should not show the dropped table
+    run dolt diff HEAD~1 --filter=modified
+    [ $status -eq 0 ]
+    [[ $output = '' ]] || false
+
+    # filter=renamed should not show the dropped table
+    run dolt diff HEAD~1 --filter=renamed
+    [ $status -eq 0 ]
+    [[ $output = '' ]] || false
+}