feat(*): add environment variable and random functions

1 files changed, 47 insertions, 0 deletions

diff --git a/spec/02-random_spec.lua b/spec/02-random_spec.lua
new file mode 100644
index 0000000..23b6d95
--- /dev/null
+++ b/spec/02-random_spec.lua
@@ -0,0 +1,47 @@
+local system = require("system")
+
+describe("Random:", function()
+
+  describe("random()", function()
+
+    it("should return random bytes for a valid number of bytes", function()
+        local num_bytes = 1
+        local result, err_msg = system.random(num_bytes)
+        assert.is_nil(err_msg)
+        assert.is.string(result)
+        assert.is_equal(num_bytes, #result)
+    end)
+
+
+    it("should return an empty string for 0 bytes", function()
+        local num_bytes = 0
+        local result, err_msg = system.random(num_bytes)
+        assert.is_nil(err_msg)
+        assert.are.equal("", result)
+    end)
+
+
+    it("should return an error message for an invalid number of bytes", function()
+        local num_bytes = -1
+        local result, err_msg = system.random(num_bytes)
+        assert.is.falsy(result)
+        assert.are.equal("invalid number of bytes, must not be less than 0", err_msg)
+    end)
+
+
+    it("should not return duplicate results", function()
+      local num_bytes = 1025
+      local result1, err_msg = system.random(num_bytes)
+      assert.is_nil(err_msg)
+      assert.is.string(result1)
+
+      local result2, err_msg = system.random(num_bytes)
+      assert.is_nil(err_msg)
+      assert.is.string(result2)
+
+      assert.is_not.equal(result1, result2)
+    end)
+
+  end)
+
+end)