Update isTrue/isFalse failure message

Author: JakeWharton

assertk/src/commonMain/kotlin/assertk/assertions/boolean.kt

@@ -2,15 +2,14 @@ package assertk.assertions
 
 import assertk.Assert
 import assertk.assertions.support.expected
-import assertk.assertions.support.fail
 
 /**
  * Asserts the boolean is true.
  * @see [isFalse]
  */
 fun Assert<Boolean?>.isTrue() = given { actual ->
     if (actual == true) return
-    fail(true, actual)
+    expected("to be true but was $actual")
 }
 
 /**
@@ -19,5 +18,5 @@ fun Assert<Boolean?>.isTrue() = given { actual ->
  */
 fun Assert<Boolean?>.isFalse() = given { actual ->
     if (actual == false) return
-    fail(false, actual)
+    expected("to be false but was $actual")
 }

assertk/src/commonTest/kotlin/test/assertk/TableTest.kt

@@ -88,7 +88,7 @@ class TableTest {
         assertEquals(
             """The following assertion failed
 	          |${"\t"}on row:(a=<false>)
-	          |${"\t"}expected:<[tru]e> but was:<[fals]e>
+	          |${"\t"}expected to be true but was false
             """.trimMargin(),
             error.message
         )

assertk/src/commonTest/kotlin/test/assertk/assertions/BooleanTest.kt

@@ -19,15 +19,15 @@ class BooleanTest {
         val error = assertFailsWith<AssertionError> {
             assertThat(false).isTrue()
         }
-        assertEquals("expected:<[tru]e> but was:<[fals]e>", error.message)
+        assertEquals("expected to be true but was false", error.message)
     }
 
     @Test
     fun isTrue_null_value_fails() {
         val error = assertFailsWith<AssertionError> {
             assertThat(null as Boolean?).isTrue()
         }
-        assertEquals("expected:<true> but was:<null>", error.message)
+        assertEquals("expected to be true but was null", error.message)
     }
     //endregion
 
@@ -42,15 +42,15 @@ class BooleanTest {
         val error = assertFailsWith<AssertionError> {
             assertThat(true).isFalse()
         }
-        assertEquals("expected:<[fals]e> but was:<[tru]e>", error.message)
+        assertEquals("expected to be false but was true", error.message)
     }
 
     @Test
     fun isFalse_null_value_fails() {
         val error = assertFailsWith<AssertionError> {
             assertThat(null as Boolean?).isFalse()
         }
-        assertEquals("expected:<false> but was:<null>", error.message)
+        assertEquals("expected to be false but was null", error.message)
     }
     //endregion
 }