feat(space_complexity): add the Go code to space complexity docs (Chapter of Computational Complexity)

codes/go/chapter_computational_complexity/space_complexity_test.go

@@ -0,0 +1,30 @@
+// File: space_complexity_test.go
+// Created Time: 2022-12-15
+// Author: cathay (cathaycchen@gmail.com)
+
+package chapter_computational_complexity
+
+import (
+	"testing"
+)
+
+func TestSpaceComplexity(t *testing.T) {
+	/* ======= Test Case ======= */
+	n := 5
+
+	/* ====== Driver Code ====== */
+	// 常数阶
+	spaceConstant(n)
+
+	// 线性阶
+	spaceLinear(n)
+	spaceLinearRecur(n)
+
+	// 平方阶
+	spaceQuadratic(n)
+	spaceQuadraticRecur(n)
+
+	// 指数阶
+	root := buildTree(n)
+	printTree(root)
+}