Find no of patterns in given string

find_occurances.go

func findOccurrencesOfSubstrings(input string, pattern string) int {
	if len(input) == 0 || len(pattern) == 0 {
		return 0
	}
	charPatternArray := []rune(pattern)
	charInputArray := []rune(input)
	patternCharTable := getLookupTable(charPatternArray)
	inputCharTable := getLookupTable(charInputArray)
	inputSum := 0
	patternSum := 0
	for _, value := range charPatternArray {
		patternSum += patternCharTable[value]
		inputSum += inputCharTable[value]
	}
	return inputSum / patternSum
}

func getLookupTable(charArray []rune) [256]int {
	charTable := [256]int{}
	for _, value := range charArray {
		charTable[value] = charTable[value] + 1
	}
	return charTable
}

func Test_findOccurrencesOfSubstrings(t *testing.T) {
	type args struct {
		input   string
		pattern string
	}
	tests := []struct {
		name string
		args args
		want int
	}{
		{name: "Case 1", args: args{input: "aAbBnlloknoaAbBnllokno", pattern: "Balloon"}, want: 2},
		{name: "Case 2", args: args{input: "aAbBnlloknoaAbBnlloknoBalloon", pattern: "Balloon"}, want: 3},
		{name: "Case 3", args: args{input: "aAbBnlloknoaAbBnlloknoBalloonBall", pattern: "Balloon"}, want: 3},
		{name: "Case 4", args: args{input: "Balloon", pattern: "Balloon"}, want: 1},
		{name: "Case 5", args: args{input: "xyzxyzxyzxyzBalloonxyz", pattern: "Balloon"}, want: 1},
		{name: "Case 6", args: args{input: "", pattern: "Balloon"}, want: 0},
		{name: "Case 7", args: args{input: "xyzxyzxyzxyzBalloonxyz", pattern: ""}, want: 0},
		{name: "Case 8", args: args{input: "xyzabc", pattern: "pqr"}},
		{name: "Case 9", args: args{input: "dhimanman", pattern: "man"}, want: 2},
		{name: "Case 10", args: args{input: "Banana", pattern: "nn"}, want: 1},
		{name: "Case 11", args: args{input: "aaaaa", pattern: "aa"}, want: 2},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := findOccurrencesOfSubstrings(tt.args.input, tt.args.pattern); got != tt.want {
				t.Errorf("findOccurrencesOfSubstrings() = %v, want %v", got, tt.want)
			}
		})
	}
}