aliases: Fuzz testing

internal/aliases/testdata/fuzz/corpus/t-002

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+# First some valid cases.
+a: b
+c: d@e, f,
+x: | command
+
+# The following is invalid, should be ignored.
+a@dom: x@dom
+
+# Overrides.
+o1: a
+o1: b
+
+# Finally one to make the file NOT end in \n:
+y: z

internal/aliases/testdata/fuzz/corpus/t-003

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+
+# Easy aliases.
+pepe: jose
+joan: juan
+
+# UTF-8 aliases.
+pitanga: ñangapirí
+añil: azul, índigo
+
+# Pipe aliases.
+tubo: | writemailto ../.data/pipe_alias_worked
+

internal/aliases/testdata/fuzz/corpus/t-004

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+
+fail: | false
+

internal/aliases/testdata/fuzz/corpus/t-005

@@ -0,0 +1,2 @@
+
+aliasA: aliasB@srv-B