build: add test coverage targets to Makefile and npm scripts

- Add test-coverage target to generate text coverage report
- Add test-coverage-report target to generate LCOV coverage report
- Add test:coverage and test:coverage:report npm scripts for convenience
- Coverage reports help identify gaps in test coverage and track code quality

Signed-off-by: leocavalcante <leo@cavalcante.dev>

Author: leocavalcante

Makefile

@@ -1,7 +1,7 @@
 PREFIX ?= /usr/local
 VERSION ?= 1.0.0
 
-.PHONY: all dev test lint format clean install build-linux-x64 build-darwin-arm64 build-windows build-all
+.PHONY: all dev test test-coverage test-coverage-report lint format clean install build-linux-x64 build-darwin-arm64 build-windows build-all
 
 all:
 	bun build --compile --minify --sourcemap \
@@ -14,6 +14,12 @@ dev:
 test:
 	bun test
 
+test-coverage:
+	bun test --coverage
+
+test-coverage-report:
+	bun test --coverage --coverage-reporter=lcov
+
 lint:
 	bunx biome check src/ tests/
 
@@ -24,7 +30,7 @@ format:
 	bunx biome format --write src/ tests/
 
 clean:
-	rm -rf opencoder opencoder-* opencoder.exe node_modules bun.lockb
+	rm -rf opencoder opencoder-* opencoder.exe node_modules bun.lockb coverage/
 
 install: all
 	install -d $(PREFIX)/bin

package.json

@@ -15,6 +15,8 @@
     "build:darwin": "bun build --compile --minify --sourcemap --target=bun-darwin-arm64 src/index.ts --outfile opencoder-darwin-arm64",
     "build:windows": "bun build --compile --minify --sourcemap --target=bun-windows-x64 src/index.ts --outfile opencoder.exe",
     "test": "bun test",
+    "test:coverage": "bun test --coverage",
+    "test:coverage:report": "bun test --coverage --coverage-reporter=lcov",
     "lint": "bunx biome check src/ tests/",
     "lint:fix": "bunx biome check --write src/ tests/",
     "format": "bunx biome format --write src/ tests/"