Add pronunciation tests in spelling_test.go

Added "TestPronounce" function in spelling_test.go file to ensure pronunciation mechanism works as expected. The function tests various cases including no syllables, single syllable, multiple syllables, and non-Koremutake syllables.

spelling_test.go

@@ -110,3 +110,52 @@ func TestSpell(t *testing.T) {
 		})
 	}
 }
+
+func TestPronounce(t *testing.T) {
+	tests := []struct {
+		name      string
+		syllables []string
+		want      string
+		wantErr   bool
+	}{
+		{
+			name:      "Pronounce_NoSyllables",
+			syllables: []string{},
+			want:      "",
+			wantErr:   false,
+		},
+		{
+			name:      "Pronounce_SingleSyllable",
+			syllables: []string{"me"},
+			want:      "me",
+			wantErr:   false,
+		},
+		{
+			name:      "Pronounce_MultipleSyllables",
+			syllables: []string{"mu", "sa"},
+			want:      "mu-sa",
+			wantErr:   false,
+		},
+		{
+			name:      "Pronounce_NonKoremutakeSyllable",
+			syllables: []string{"ä"},
+			wantErr:   true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			config := NewConfig()
+			g := New(config)
+			g.syllables = tt.syllables
+			got, err := g.Pronounce()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Generator.Pronounce() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("Generator.Pronounce() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}