test: add tests for glob matching (#319)

This helps demonstrate how our globbing works.

Author: zimbatm

format/glob_test.go

@@ -0,0 +1,41 @@
+package format_test
+
+import (
+	"testing"
+
+	"git.numtide.com/numtide/treefmt/format"
+
+	"github.com/gobwas/glob"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGlobs(t *testing.T) {
+	r := require.New(t)
+
+	var (
+		globs []glob.Glob
+		err   error
+	)
+
+	// File extension
+	globs, err = format.CompileGlobs([]string{"*.txt"})
+	r.NoError(err)
+	r.True(format.PathMatches("test/foo/bar.txt", globs))
+	r.False(format.PathMatches("test/foo/bar.txtz", globs))
+	r.False(format.PathMatches("test/foo/bar.flob", globs))
+
+	// Prefix matching
+	globs, err = format.CompileGlobs([]string{"test/*"})
+	r.NoError(err)
+	r.True(format.PathMatches("test/bar.txt", globs))
+	r.True(format.PathMatches("test/foo/bar.txt", globs))
+	r.False(format.PathMatches("/test/foo/bar.txt", globs))
+
+	// Exact matches
+	// File extension
+	globs, err = format.CompileGlobs([]string{"LICENSE"})
+	r.NoError(err)
+	r.True(format.PathMatches("LICENSE", globs))
+	r.False(format.PathMatches("test/LICENSE", globs))
+	r.False(format.PathMatches("LICENSE.txt", globs))
+}

nix/treefmt.nix

@@ -26,7 +26,7 @@
         global.excludes = [
           "LICENSE"
           # let's not mess with the test folder
-          "test/**"
+          "test/*"
           # unsupported extensions
           "*.{gif,png,svg,tape,mts,lock,mod,sum,toml,env,envrc,gitignore}"
         ];