kernel_features: fix tests for new KernelConfig

[rafaeldtinoco]

This is a preparation for a fix for: aquasecurity/tracee#851

[rafaeldtinoco]

This is the missing tests for the KernelConfig API we've discussed.

[grantseltzer]

Some of these are failing for me:

[*] go test .                                                                                            
--- FAIL: TestGetKernelConfigValue (0.02s)
    --- FAIL: TestGetKernelConfigValue/multiple_options_ok (0.01s)
        kernel_features_test.go:75: 
            	Error Trace:	kernel_features_test.go:75
            	Error:      	Not equal: 
            	            	expected: 0x2
            	            	actual  : 0x0
            	Test:       	TestGetKernelConfigValue/multiple_options_ok
        kernel_features_test.go:76: 
            	Error Trace:	kernel_features_test.go:76
            	Error:      	Not equal: 
            	            	expected: <nil>(<nil>)
            	            	actual  : *errors.errorString(&errors.errorString{s:"given option's value (CONFIG_TEST_BPF) is undefined"})
            	Test:       	TestGetKernelConfigValue/multiple_options_ok
        kernel_features_test.go:75: 
            	Error Trace:	kernel_features_test.go:75
            	Error:      	Not equal: 
            	            	expected: 0x2
            	            	actual  : 0x0
            	Test:       	TestGetKernelConfigValue/multiple_options_ok
        kernel_features_test.go:76: 
            	Error Trace:	kernel_features_test.go:76
            	Error:      	Not equal: 
            	            	expected: <nil>(<nil>)
            	            	actual  : *errors.errorString(&errors.errorString{s:"given option's value (CONFIG_TEST_BPF) is undefined"})
            	Test:       	TestGetKernelConfigValue/multiple_options_ok
    --- FAIL: TestGetKernelConfigValue/string_value_ok (0.00s)
        kernel_features_test.go:75: 
            	Error Trace:	kernel_features_test.go:75
            	Error:      	Not equal: 
            	            	expected: "250"
            	            	actual  : "1000"
            	            	
            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1 +1 @@
            	            	-250
            	            	+1000
            	Test:       	TestGetKernelConfigValue/string_value_ok
        kernel_features_test.go:75: 
            	Error Trace:	kernel_features_test.go:75
            	Error:      	Not equal: 
            	            	expected: "250"
            	            	actual  : "1000"
            	            	
            	            	Diff:
            	            	--- Expected
            	            	+++ Actual
            	            	@@ -1 +1 @@
            	            	-250
            	            	+1000
            	Test:       	TestGetKernelConfigValue/string_value_ok
FAIL
FAIL	github.com/aquasecurity/libbpfgo/helpers	0.140s
FAIL

[rafaeldtinoco]

All good here using the files from the testdata directory:

/usr/lib/go-1.16/bin/go tool test2json -t /tmp/GoLand/___TestGetKernelConfigValue_in_github_com_aquasecurity_libbpfgo_helpers.test -test.v -test.paniconexit0 -test.run ^\QTestGetKernelConfigValue\E$
=== RUN   TestGetKernelConfigValue
=== RUN   TestGetKernelConfigValue/option_ok
=== RUN   TestGetKernelConfigValue/multiple_options_ok
=== RUN   TestGetKernelConfigValue/multiple_options_ok_with_single_not_ok
=== RUN   TestGetKernelConfigValue/multiple_options_ok_with_multiple_not_ok
=== RUN   TestGetKernelConfigValue/undefined_value
--- PASS: TestGetKernelConfigValue (0.00s)
    --- PASS: TestGetKernelConfigValue/option_ok (0.00s)
    --- PASS: TestGetKernelConfigValue/multiple_options_ok (0.00s)
    --- PASS: TestGetKernelConfigValue/multiple_options_ok_with_single_not_ok (0.00s)
    --- PASS: TestGetKernelConfigValue/multiple_options_ok_with_multiple_not_ok (0.00s)
    --- PASS: TestGetKernelConfigValue/undefined_value (0.00s)
PASS

[grantseltzer]

LGTM :-)