Indeed, there are currently no rendering-related tests for extension functions. There are tests for DRI's and other documentable-related logic, but not for rendering.

Should be fairly easy to implement, there's a lot of available test utilities for such tests already. For instance have a look at signature tests:

dokka/plugins/base/src/test/kotlin/signatures/SignatureTest.kt

Lines 170 to 189 in 6e20d40

    
           fun `fun with keywords, params and generic bound`() { 
        
               val source = source("inline suspend fun <T : String> simpleFun(a: Int, b: String): T = \"Celebrimbor\" as T") 
        
               val writerPlugin = TestOutputWriterPlugin() 
        
               testInline( 
        
                   source, 
        
                   configuration, 
        
                   pluginOverrides = listOf(writerPlugin) 
        
               ) { 
        
                   renderingStage = { _, _ -> 
        
                       writerPlugin.writer.renderedContent("root/example/simple-fun.html").firstSignature().match( 
        
                           "inline suspend fun <", A("T"), " : ", A("String"), "> ", A("simpleFun"), "(", Parameters( 
        
                               Parameter("a: ", A("Int"), ","), 
        
                               Parameter("b: ", A("String")), 
        
                           ), "): ", A("T"), Span(), 
        
                           ignoreSpanWithTokenStyle = true 
        
                       ) 
        
                   } 
        
               } 
        
           }

Contact me here or via Kotlin Community Slack if you want to give it a go, I'll provide help.

	fun `fun with keywords, params and generic bound`() {
	val source = source("inline suspend fun <T : String> simpleFun(a: Int, b: String): T = \"Celebrimbor\" as T")
	val writerPlugin = TestOutputWriterPlugin()

	testInline(
	source,
	configuration,
	pluginOverrides = listOf(writerPlugin)
	) {
	renderingStage = { _, _ ->
	writerPlugin.writer.renderedContent("root/example/simple-fun.html").firstSignature().match(
	"inline suspend fun <", A("T"), " : ", A("String"), "> ", A("simpleFun"), "(", Parameters(
	Parameter("a: ", A("Int"), ","),
	Parameter("b: ", A("String")),
	), "): ", A("T"), Span(),
	ignoreSpanWithTokenStyle = true
	)
	}
	}
	}

Extension rendering tests #1030

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