chore: added an assortment of unit tests (#205)

## PR Checklist

- [x] Addresses an existing open issue: starts on #7, #8, #9, #10, #11,
#12, #13, #14
- [x] That issue was marked as [`status: accepting
prs`](/~https://github.com/JoshuaKGoldberg/ts-api-utils/issues?q=is%3Aopen+is%3Aissue+label%3A%22status%3A+accepting+prs%22)
- [x] Steps in
[CONTRIBUTING.md](/~https://github.com/JoshuaKGoldberg/ts-api-utils/blob/main/.github/CONTRIBUTING.md)
were taken

## Overview

I had some time on a road trip today and was motivated to backfill some
tests 😄. Doesn't add in 100% coverage on any file or really finish any
of the linked issues. Just raises test coverage across the board in
general.

Co-authored-by: Rebecca Stevens <rebecca.stevens@outlook.co.nz>

src/comments.test.ts

@@ -0,0 +1,52 @@
+import ts from "typescript";
+import { describe, expect, it, vitest } from "vitest";
+
+import { forEachComment } from "./comments";
+import { createNodeAndSourceFile } from "./test/utils";
+import { isTsVersionAtLeast } from "./utils";
+
+describe("forEachComment", () => {
+	it("does not call the callback when the source has no comments", () => {
+		const { node, sourceFile } = createNodeAndSourceFile("let value;");
+		const callback = vitest.fn();
+
+		forEachComment(node, callback, sourceFile);
+
+		expect(callback).not.toHaveBeenCalled();
+	});
+
+	if (isTsVersionAtLeast(4, 3)) {
+		it("calls the callback when the source has a leading comment", () => {
+			const { node, sourceFile } = createNodeAndSourceFile(`
+            // hello world
+            let value;
+        `);
+			const callback = vitest.fn();
+
+			forEachComment(node, callback, sourceFile);
+
+			expect(callback).toHaveBeenCalledWith(
+				sourceFile.getFullText(),
+				expect.objectContaining({
+					kind: ts.SyntaxKind.SingleLineCommentTrivia,
+				})
+			);
+		});
+
+		it("calls the callback when the source has a trailing comment", () => {
+			const { node, sourceFile } = createNodeAndSourceFile(`
+            let value; // hello world
+        `);
+			const callback = vitest.fn();
+
+			forEachComment(node, callback, sourceFile);
+
+			expect(callback).toHaveBeenCalledWith(
+				sourceFile.getFullText(),
+				expect.objectContaining({
+					kind: ts.SyntaxKind.SingleLineCommentTrivia,
+				})
+			);
+		});
+	}
+});

src/nodes/typeGuards/compound.test.ts

@@ -4,24 +4,14 @@ import { describe, expect, it } from "vitest";
 import { createNode } from "../../test/utils";
 import {
 	isConstAssertionExpression,
+	isIterationStatement,
+	isNamedDeclarationWithName,
+	isNamespaceDeclaration,
 	isNumericOrStringLikeLiteral,
+	isSuperElementAccessExpression,
+	isSuperPropertyAccessExpression,
 } from "./compound";
 
-describe("isNumericOrStringLikeLiteral", () => {
-	it.each([
-		[false, "an identifier", ts.factory.createIdentifier("abc")],
-		[
-			true,
-			"a no substitution template literal",
-			ts.factory.createNoSubstitutionTemplateLiteral("abc"),
-		],
-		[true, "a numeric literal", ts.factory.createNumericLiteral("123")],
-		[true, "a string literal", ts.factory.createStringLiteral("abc")],
-	])("returns %j when given %s", (expected, _, node) => {
-		expect(isNumericOrStringLikeLiteral(node)).toBe(expected);
-	});
-});
-
 describe("isConstAssertionExpression", () => {
 	it.each([
 		[
@@ -65,3 +55,76 @@ describe("isConstAssertionExpression", () => {
 		expect(isConstAssertionExpression(createNode(node))).toBe(expected);
 	});
 });
+
+describe("isIterationStatement", () => {
+	it.each([
+		[true, "do {} while (0)"],
+		[true, "for (;;) {}"],
+		[true, "for (const _ in {}) {}"],
+		[true, "for (const _ of []) {}"],
+		[true, "while (0) {}"],
+		[false, "let _"],
+	])("returns %j when given %s", (expected, code) => {
+		expect(isIterationStatement(createNode(code))).toBe(expected);
+	});
+});
+
+describe("isNamedDeclarationWithName", () => {
+	it.each([
+		[true, "class HasName {}"],
+		[false, "const _ = class {}"],
+		[false, "let _"],
+	])("returns %j when given %s", (expected, code) => {
+		expect(isNamedDeclarationWithName(createNode<ts.Declaration>(code))).toBe(
+			expected
+		);
+	});
+});
+
+describe("isNamespaceDeclaration", () => {
+	it.each([
+		[true, "namespace A {}"],
+		[true, "namespace A.B {}"],
+		[false, "let _"],
+	])("returns %j when given %s", (expected, code) => {
+		expect(isNamespaceDeclaration(createNode(code))).toBe(expected);
+	});
+});
+
+describe("isNumericOrStringLikeLiteral", () => {
+	it.each([
+		[false, "an identifier", ts.factory.createIdentifier("abc")],
+		[
+			true,
+			"a no substitution template literal",
+			ts.factory.createNoSubstitutionTemplateLiteral("abc"),
+		],
+		[true, "a numeric literal", ts.factory.createNumericLiteral("123")],
+		[true, "a string literal", ts.factory.createStringLiteral("abc")],
+	])("returns %j when given %s", (expected, _, node) => {
+		expect(isNumericOrStringLikeLiteral(node)).toBe(expected);
+	});
+});
+
+describe("isSuperElementAccessExpression", () => {
+	it.each([
+		[true, "super['property']"],
+		[false, "super.property"],
+		[false, "super.method()"],
+		[false, "super()"],
+		[false, "other()"],
+	])("returns %j when given %s", (expected, code) => {
+		expect(isSuperElementAccessExpression(createNode(code))).toBe(expected);
+	});
+});
+
+describe("isSuperPropertyAccessExpression", () => {
+	it.each([
+		[true, "super.property"],
+		[false, "super.method()"],
+		[false, "super()"],
+		[false, "other()"],
+	])("returns %j when given %s", (expected, code) => {
+		expect(isSuperPropertyAccessExpression(createNode(code))).toBe(expected);
+	});
+});

src/nodes/typeGuards/compound.ts

@@ -72,11 +72,11 @@ export function isIterationStatement(
 	node: ts.Node
 ): node is ts.IterationStatement {
 	switch (node.kind) {
-		case ts.SyntaxKind.ForStatement:
-		case ts.SyntaxKind.ForOfStatement:
+		case ts.SyntaxKind.DoStatement:
 		case ts.SyntaxKind.ForInStatement:
+		case ts.SyntaxKind.ForOfStatement:
+		case ts.SyntaxKind.ForStatement:
 		case ts.SyntaxKind.WhileStatement:
-		case ts.SyntaxKind.DoStatement:
 			return true;
 		default:
 			return false;