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test: expand token utility coverage #1052

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test: expand token utility coverage #1052

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44 changes: 44 additions & 0 deletions src/tokens.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,35 @@ describe("iterateTokens", () => {
expect(tokens.every((token) => ts.isTokenKind(token.kind))).toBe(true);
expect(generator.next()).toEqual({ done: true, value: undefined });
});

it("Should preserve source order for nested nodes", () => {
const { node } = createNodeAndSourceFile("const value = call(1 + 2);");

expect([...iterateTokens(node)].map((token) => token.getText())).toEqual([
"const",
"value",
"=",
"call",
"(",
"1",
"+",
"2",
")",
";",
]);
});

it("Should yield a token node directly", () => {
const sourceFile = ts.createSourceFile(
"file.ts",
"identifier",
ts.ScriptTarget.Latest,
true,
);
const token = sourceFile.getFirstToken()!;

expect([...iterateTokens(token, sourceFile)]).toEqual([token]);
});
});

describe("forEachToken", () => {
Expand All @@ -26,4 +55,19 @@ describe("forEachToken", () => {

expect(callback).toBeCalledTimes(3);
});

it("Should use the node source file by default", () => {
const { node } = createNodeAndSourceFile("let value = 1;");
const tokens: ts.Node[] = [];

forEachToken(node, (token) => tokens.push(token));

expect(tokens.map((token) => token.getText())).toEqual([
"let",
"value",
"=",
"1",
";",
]);
});
});