[Analysis API] add few tests which checks contracts of signature substitutions

analysis/analysis-api/src/org/jetbrains/kotlin/analysis/api/components/KtSignatureSubsitutor.kt

@@ -79,7 +79,7 @@ public interface KtSignatureSubsitutorMixIn : KtAnalysisSessionMixIn {
      *
      * @see KtSubstitutor.substituteOrSelf
      */
-    public fun <S : KtFunctionSymbol> S.substitute(substitutor: KtSubstitutor): KtFunctionLikeSignature<S> =
+    public fun <S : KtFunctionLikeSymbol> S.substitute(substitutor: KtSubstitutor): KtFunctionLikeSignature<S> =
         withValidityAssertion { analysisSession.substitutionProvider.substitute(this, substitutor) }
 
     /**

analysis/analysis-api/testData/components/signatureSubstitution/signatureContracts/members.kt

@@ -0,0 +1,16 @@
+class X<T> {
+    fun <A> foo(): T {}
+
+    fun <A> A.foo1(t: T) {}
+
+    fun <A> foo2(a: A) {}
+
+    fun <A, B : Number> T.foo3(a: A): Map<B, List<A>> {}
+
+    fun <A, B : Collection<A>, C : A> foo4(a: A, T): B {}
+
+    val <A> A.bar1: T get() = 10
+
+    val <A> A.bar2: Map<A, T> get() = mapOf()
+
+}

analysis/analysis-api/testData/components/signatureSubstitution/signatureContracts/topLevel.kt

@@ -0,0 +1,13 @@
+fun <A> foo(): A {}
+
+fun <A> A.foo1() {}
+
+fun <A> foo2(a: A) {}
+
+fun <A, B: Number> foo3(a: A): Map<B, List<A>> {}
+
+fun <A, B: Collection<A>, C : A> foo4(a: A): B {}
+
+val <A> A.bar1: Int get() = 10
+
+val <A> A.bar2: List<A> get() = listOf(this)