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88 lines
2.7 KiB
Nim
88 lines
2.7 KiB
Nim
## Unit tests for the identifier-casing helpers used by the codegen.
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## These names map identifier conventions between Nim (camelCase),
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## Rust (snake_case) and C++ (PascalCase types), and they're load-bearing
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## for binding generation, so it's worth pinning their behaviour with tests.
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import unittest
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import ffi/codegen/string_helpers
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suite "camelToSnakeCase":
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test "empty string":
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check camelToSnakeCase("") == ""
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test "single lowercase character":
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check camelToSnakeCase("a") == "a"
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test "single uppercase character":
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check camelToSnakeCase("A") == "a"
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test "all lowercase passes through":
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check camelToSnakeCase("hello") == "hello"
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test "simple camelCase":
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check camelToSnakeCase("camelCase") == "camel_case"
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test "two-letter suffix":
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check camelToSnakeCase("delayMs") == "delay_ms"
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test "PascalCase input — leading capital stays at start":
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check camelToSnakeCase("PascalCase") == "pascal_case"
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test "consecutive uppercase letters each get their own underscore":
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check camelToSnakeCase("ABC") == "a_b_c"
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test "multiple word boundaries":
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check camelToSnakeCase("abcDefGhi") == "abc_def_ghi"
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test "already snake_case passes through":
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check camelToSnakeCase("already_snake") == "already_snake"
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suite "capitalizeFirstLetter":
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test "empty string":
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check capitalizeFirstLetter("") == ""
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test "single lowercase character":
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check capitalizeFirstLetter("a") == "A"
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test "single uppercase character":
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check capitalizeFirstLetter("A") == "A"
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test "lowercase word":
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check capitalizeFirstLetter("abc") == "Abc"
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test "already capitalised":
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check capitalizeFirstLetter("Abc") == "Abc"
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test "all-caps stays unchanged except first stays cap":
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check capitalizeFirstLetter("ABC") == "ABC"
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test "leading non-letter is left alone":
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check capitalizeFirstLetter("_hello") == "_hello"
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suite "snakeToPascalCase":
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test "empty string":
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check snakeToPascalCase("") == ""
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test "single lowercase word":
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check snakeToPascalCase("hello") == "Hello"
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test "two-part snake_case":
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check snakeToPascalCase("hello_world") == "HelloWorld"
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test "three-part snake_case":
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check snakeToPascalCase("testlib_create") == "TestlibCreate"
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test "single-letter parts each capitalised":
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check snakeToPascalCase("a_b_c") == "ABC"
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test "trailing underscore yields empty trailing part":
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check snakeToPascalCase("foo_") == "Foo"
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test "leading underscore yields empty leading part":
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check snakeToPascalCase("_foo") == "Foo"
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test "already-mixed parts preserve their existing case after the first":
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# split on '_', capitalize first letter of each part; "HasCaps" first
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# letter is already 'H' so it's untouched.
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check snakeToPascalCase("already_HasCaps") == "AlreadyHasCaps"
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