encodeMap() error handling and TestEncoder_UnmarshallableTypes()

[dorencambia]

Problem

I encountered an issue where unmarshallable types in maps do not properly handle errors.

bytes, err := yaml.Marshal(map[string]any{"a": make(chan int)}) returns a nil error and string(bytes) is <nil>\n.

Similarly, calling Marshal on nested map[string]any{"a": map[string]any{"b": make(chan string)}} returns a nil error and string(bytes) is %!v(PANIC=String method: runtime error: invalid memory address or nil pointer dereference)\n

Solution

Add error to return value in func (e *Encoder) encodeMap(ctx context.Context, value reflect.Value, column int) (ast.Node, error) and return the error when value can't be encoded.

Testing

Add new func TestEncoder_UnmarshallableTypes(t *testing.T) with these test cases:

• channel
• function
• complex number
• unsafe pointer
• uintptr
• map with channel
• nested map with func
• slice with channel
• nested slice with complex number
• struct with unsafe pointer

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.84%. Comparing base (944206a) to head (5a65c54).

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #674      +/-   ##
==========================================
+ Coverage   77.63%   77.84%   +0.21%     
==========================================
  Files          22       22              
  Lines        7959     7959              
==========================================
+ Hits         6179     6196      +17     
+ Misses       1362     1350      -12     
+ Partials      418      413       -5     

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[goccy]

Thank you for your great PR !! LGTM 👍