Define more test cases for resistor color

Context

go/exercises/practice/resistor-color/cases_test.go

Lines 20 to 36 in 3fdc970

    
           var colorCodeTestCases = []colorCodeTestCase{ 
        
           	{ 
        
           		description: "Black", 
        
           		input:       "black", 
        
           		expected:    0, 
        
           	}, 
        
           	{ 
        
           		description: "White", 
        
           		input:       "white", 
        
           		expected:    9, 
        
           	}, 
        
           	{ 
        
           		description: "Orange", 
        
           		input:       "orange", 
        
           		expected:    3, 
        
           	}, 
        
           }

Problem

These test cases aren't exhaustive. There are several colors described in the exercise that aren't tested here.

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	var colorCodeTestCases = []colorCodeTestCase{
	{
	description: "Black",
	input: "black",
	expected: 0,
	},
	{
	description: "White",
	input: "white",
	expected: 9,
	},
	{
	description: "Orange",
	input: "orange",
	expected: 3,
	},
	}