add failing test case
This case should be expected to fail with the current diff algorithm, but the existing behavior was widely relied upon so we need to roll this back until there is a representable nil value.
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@ -3110,6 +3110,36 @@ func TestSchemaMap_Diff(t *testing.T) {
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Err: true,
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},
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// A lot of resources currently depended on using the empty string as a
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// nil/unset value.
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{
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Name: "optional, computed, empty string",
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Schema: map[string]*Schema{
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"attr": &Schema{
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Type: TypeString,
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Optional: true,
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Computed: true,
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},
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},
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State: &terraform.InstanceState{
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Attributes: map[string]string{
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"attr": "bar",
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},
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},
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// this does necessarily depend on an interpolated value, but this
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// is often how it comes about in a configuration, otherwise the
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// value would be unset.
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Config: map[string]interface{}{
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"attr": "${var.foo}",
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},
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ConfigVariables: map[string]ast.Variable{
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"var.foo": interfaceToVariableSwallowError(""),
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},
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},
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}
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for i, tc := range cases {
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