test: add benchmarks for project filtering performance

* add benchmark tests for Filter function with different scenarios
* test performance with 1000 projects for fuzzy matching, exact matching, no matches, and empty queries
* add Nix script for running benchmarks across all packages

Author: csvenke

internal/projects/projects_benchmark_test.go

@@ -0,0 +1,53 @@
+package projects
+
+import (
+	"fmt"
+	"testing"
+)
+
+// generateProjects creates a slice of 'count' mock projects for benchmarking.
+func generateProjects(count int) []Project {
+	projects := make([]Project, count)
+	for i := range count {
+		name := fmt.Sprintf("project-%04d", i)
+		path := fmt.Sprintf("/repos/%s", name)
+		projects[i] = Project{Name: name, Path: path}
+	}
+	return projects
+}
+
+func BenchmarkFilter1000Projects(b *testing.B) {
+	allProjects := generateProjects(1000)
+	query := "proj-9" // A query that will match some projects, testing the fuzzy logic
+
+	for b.Loop() {
+		Filter(allProjects, query)
+	}
+}
+
+func BenchmarkFilter1000Projects_NoMatch(b *testing.B) {
+	allProjects := generateProjects(1000)
+	query := "nonexistentquery" // A query that will not match any projects
+
+	for b.Loop() {
+		Filter(allProjects, query)
+	}
+}
+
+func BenchmarkFilter1000Projects_ExactMatch(b *testing.B) {
+	allProjects := generateProjects(1000)
+	query := "project-0500" // A query that will exactly match one project
+
+	for b.Loop() {
+		Filter(allProjects, query)
+	}
+}
+
+func BenchmarkFilter1000Projects_EmptyQuery(b *testing.B) {
+	allProjects := generateProjects(1000)
+	query := "" // An empty query should return all projects without fuzzy matching
+
+	for b.Loop() {
+		Filter(allProjects, query)
+	}
+}

nix/scripts/benchmark.nix

@@ -0,0 +1,9 @@
+{ writeShellApplication, go }:
+
+writeShellApplication {
+  name = "benchmark";
+  runtimeInputs = [ go ];
+  text = ''
+    go test -bench=. ./...
+  '';
+}