#53 Add tests and refactor Algorithm constants

Test suite `TestIntToAlgo` was added to `algo_test.go` to validate `IntToAlgo` function. Additionally, Algorithm constants in `algo.go` have been prefixed with "Algo". These changes were made in order to make the code clearer and ensure the function returns the expected values for the given inputs.

algo.go

@@ -5,14 +5,14 @@ package apg
 type Algorithm int
 
 const (
-	// Pronouncable represents the algorithm for pronouncable passwords
+	// AlgoPronouncable represents the algorithm for pronouncable passwords
 	// (koremutake syllables)
-	Pronouncable Algorithm = iota
-	// Random represents the algorithm for purely random passwords according
+	AlgoPronouncable Algorithm = iota
+	// AlgoRandom represents the algorithm for purely random passwords according
 	// to the provided password modes/flags
-	Random
-	// Unsupported represents an unsupported algorithm
-	Unsupported
+	AlgoRandom
+	// AlgoUnsupported represents an unsupported algorithm
+	AlgoUnsupported
 )
 
 // IntToAlgo takes an int value as input and returns the corresponding
@@ -20,10 +20,10 @@ const (
 func IntToAlgo(a int) Algorithm {
 	switch a {
 	case 0:
-		return Pronouncable
+		return AlgoPronouncable
 	case 1:
-		return Random
+		return AlgoRandom
 	default:
-		return Unsupported
+		return AlgoUnsupported
 	}
 }

algo_test.go

@@ -0,0 +1,23 @@
+package apg
+
+import "testing"
+
+func TestIntToAlgo(t *testing.T) {
+	tt := []struct {
+		name string
+		a    int
+		e    Algorithm
+	}{
+		{"AlgoPronouncable", 0, AlgoPronouncable},
+		{"AlgoRandom", 1, AlgoRandom},
+		{"AlgoUnsupported", 2, AlgoUnsupported},
+	}
+	for _, tc := range tt {
+		t.Run(tc.name, func(t *testing.T) {
+			a := IntToAlgo(tc.a)
+			if a != tc.e {
+				t.Errorf("IntToAlgo() failed, expected: %d, got: %d", tc.e, a)
+			}
+		})
+	}
+}