Initial commit: Pi calculation benchmark with 34 languages

- Added implementations for: bash, brainfuck, c, cpp, crystal, csharp, d, dart, elixir, erlang, fortran, go, haskell, java, javascript, julia, kotlin, objective-c, scala, typescript, lua, nim, odin, perl, php, python, r, ruby, rust, swift, zig, assembly, vimscript, wolfram
- All implementations use Machin's formula: π/4 = 4*arctan(1/5) - arctan(1/239)
- Build system with ./build.sh, test system with ./test.sh
- Performance testing with ./run_all.sh
- Comprehensive README.md explaining performance differences
- Test framework verifies correctness against known π values

go/src/pi_test.go

@@ -0,0 +1,73 @@
+package main
+
+import (
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+const scriptPath = "/Users/einand/Code/test/go/print_hej"
+
+func runScript(decimals ...int) string {
+	args := []string{}
+	if len(decimals) > 0 {
+		args = append(args, string(rune(decimals[0])))
+	}
+	cmd := exec.Command(scriptPath, args...)
+	output, err := cmd.Output()
+	if err != nil {
+		panic(err)
+	}
+	return strings.TrimSpace(string(output))
+}
+
+func Test10Decimals(t *testing.T) {
+	result := runScript(10)
+	expected := "3.1415926535"
+	if result != expected {
+		t.Errorf("Expected %s, got %s", expected, result)
+	}
+}
+
+func Test5Decimals(t *testing.T) {
+	result := runScript(5)
+	expected := "3.14159"
+	if result != expected {
+		t.Errorf("Expected %s, got %s", expected, result)
+	}
+}
+
+func Test1Decimal(t *testing.T) {
+	result := runScript(1)
+	expected := "3.1"
+	if result != expected {
+		t.Errorf("Expected %s, got %s", expected, result)
+	}
+}
+
+func Test100Decimals(t *testing.T) {
+	result := runScript(100)
+	expected := "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679"
+	if result != expected {
+		t.Errorf("Expected %s, got %s", expected, result)
+	}
+}
+
+func TestDefault100Decimals(t *testing.T) {
+	result := runScript()
+	expected := "3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679"
+	if result != expected {
+		t.Errorf("Expected %s, got %s", expected, result)
+	}
+}
+
+func Test10000Decimals(t *testing.T) {
+	result := runScript(10000)
+	// Check length: "3." + 10000 digits = 10002 characters
+	if len(result) != 10002 {
+		t.Errorf("Expected 10002 characters, got %d", len(result))
+	}
+	if !strings.HasPrefix(result, "3.14159") {
+		t.Errorf("Result should start with 3.14159, got %s", result[:10])
+	}
+}