Thematische Bibliographien / Test flakiness

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Auswahl der wissenschaftlichen Literatur zum Thema „Test flakiness“

Autor: Grafiati

Veröffentlicht am 25. Juni 2021

Zuletzt aktualisiert am 17. Februar 2022

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Zeitschriftenartikel zum Thema "Test flakiness"

Zhang, Hua Yong, Xiao Jian Liu, Hai Yan Sun und Chun Sheng Fan. „A Sample Holder for X-Ray Powder Diffraction Studies of Flakiness and Block Sample“. Key Engineering Materials 544 (März 2013): 433–36. http://dx.doi.org/10.4028/www.scientific.net/kem.544.433.

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Powder X-ray diffraction (XRD) is one of the primary techniques used to characterize solid state materials. But there is not a sample holder which can be fit into the sample carrier of the Bruker D8-Advance x-ray powder diffractometer for flakiness and block samples test. In this article, we will design, manufacture and evaluate a sample holder for flakiness and block samples. Materials of the holder are steel, glass and plasticine etc. The holder is low cost, easy to be processed, convenience to prepare the samples, and accurately obtain the best analytical results.

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Li, Yue Hong, Ping Zhang und Bai Shou Li. „Research of Ductility and Crack of Square Steel Tube Regeneration Block Mixed Short Columns“. Advanced Materials Research 608-609 (Dezember 2012): 1764–68. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.1764.

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In order to analyze regeneration block mixed short columns and crack of recycled blocks, to flakiness ratio, mixing ratio, confinement coefficient and there are no ribs for the pilot study on main parameters, on root regeneration of thin-walled square tube 15 blocks of mixed axial compression test of short column. Research results indicates that: Specimen without ribs of ductility coefficient are going with flakiness ratio confinement coefficient of increases and reduces, approximate is linear relationship; and Specimen with rib short column of ductility coefficient are with flakiness ratio and confinement coefficient of increases and first increases then reduces, approximate is parabola relationship; internal concrete of Specimen without ribs of crack distribution concentrated in column Central, and internal concrete of Specimen with ribs of crack distribution along axis to more uniform, with ANSYS established model on internal concrete crack for nonlinear analysis. And experimental waist-shaped crease damaged concrete cracks occurred when parts of development corresponds to the situation.

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Jing, G. Q., Y. M. Ji, W. L. Qiang und R. Zhang. „Experimental and Numerical Study on Ballast Flakiness and Elongation Index by Direct Shear Test“. International Journal of Geomechanics 20, Nr. 10 (Oktober 2020): 04020169. http://dx.doi.org/10.1061/(asce)gm.1943-5622.0001791.

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Nur Hidayah, A. H., Md Nor Hasanan und P. J. Ramadhansyah. „Effect of Coarse Aggregate Sizes on Properties of Porous Concrete Paving Blocks“. Advanced Materials Research 911 (März 2014): 433–37. http://dx.doi.org/10.4028/www.scientific.net/amr.911.433.

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Properties of Porous Concrete Paving Blocks (PCPB) were investigated in this study. Two groups of coarse aggregate sizes were performed; passing 8 mm retains 5 mm and passing 10 mm retains 8 mm. For mixture design, 100 % of coarse aggregate were used. However, fine aggregate was eliminated in this investigation. The density, water absorption, flakiness index and elongation index test were performed to determine the properties of the coarse aggregate used in this study. Compression test and skid resistance test were used to evaluate the performance of PCPB. The results show that PCPB containing coarse aggregate size 5 8 mm give high compressive strength compared to others PCPB specimen. In addition, both PCPB specimens give an in increasing in skid resistance approximately 30 % compared to Concrete Paving Blocks (CPB).

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Gonfa, Lami Gonfa, Emer Tucay Quezon Tucay Quezon und Anteneh Geremew. „EXPERIMENTAL STUDY ON APPLICATION OF MARBLE WASTE AS CONVENTIONAL AGGREGATE FOR BASE COURSE MATERIALS“. Journal of Civil Engineering, Science and Technology 11, Nr. 2 (30.09.2020): 144–63. http://dx.doi.org/10.33736/jcest.2620.2020.

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Recently, highway and construction industries utilize a substantial quantity of conventional aggregates. The increasing demands for conventional aggregate cause an increase in the cost of construction, reduction of natural resource, and continuing deterioration of the earth's surface. On the other hand, the waste generated from the marble industries during the process of cutting and polishing was increasing day by day all over the world. In Ethiopia, the use of Marble Waste Aggregate materials in road construction as a base course material was not well-known, and it was simply wasted at every place where the marble production was continuing. Therefore, this paper focused on evaluating the possibility of using marble waste aggregate as conventional aggregate in the base course layer of flexible pavements by experimental method. To achieve the objectives of the research, mechanical stabilization and laboratory tests have been carried out at different percentage replacement of Conventional Aggregate by (0%, 20%, 40%, 50%, 60%, 80%, and 100%) of Marble Waste Aggregate weights. Marble wastes materials are collected from Burayyu city, Alisha marble processing industry. The laboratory test results for MWA indicated SG, ACV, AIV, LAA, Flakiness Index , Elongation Index, Plastic Index, Water Absorption, and CBR of 2.74%, 23.63%, 26.21%, 27.03%, 26.48%, 13.29%, Non Plastic, 0.50% and 73.3%, respectively. These test results fulfilled the ERA standard specification for some tests, and it showed marginal quality values to the standard specification for GB2 and GB3 base course materials. CBR and gradation test results shown failure to meet the standard specification. Thus, mechanical stabilization was done to improve the mechanical and physical properties of Marble Waste Aggregate. Blending of 80%MWA with 20% CA results in SG, ACV, AIV, LAA, Flakiness Index, Elongation Index, Plastic Index, Water Absorption, and CBR of 2.83%, 18.2%, 21.52%, 22.58%, 23.79%, 16.29%, Non Plastic, 0.80%,and 82.5% respectively. At this proportion the gradation also observed to fit with the required ERA standard specification of GB2 and GB3 materials. Therefore, the use of marble waste aggregate up to 80% by weight is recommended for road base course layer, when it is found near to the construction site and in places where the materials are abundantly available.

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Seyfe, M., und A. Geremew. „POTENTIAL USE OF CINDER GRAVEL AS AN ALTERNATIVE BASE COURSE MATERIAL THROUGH BLENDING WITH CRUSHED STONE AGGREGATE AND CEMENT TREATMENT“. Journal of Civil Engineering, Science and Technology 10, Nr. 2 (29.09.2019): 101–12. http://dx.doi.org/10.33736/jcest.1465.2019.

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Cinder gravels are pyroclastic materials associated with recent volcanic activity which occur in characteristically straight sided cone shaped hills. The aim of this study was to use this marginal material which is abundantly available in many parts of Ethiopia by modifying their properties through mechanical blending and chemical stabilization. Results of physical and mechanical test conducted on cinder gravel samples prove their marginality to be used as base course materials especially for highly trafficked roads. An experimental investigation were carried by blending cinder gravels with conventional crushed stone bases course material, Crushed Stone Aggregate (CSA), in proportions of cinder/ Crushed Stone Aggregate (CSA) (10/90, 20/80, 30/70, 40/60 and 50/50) and treating with 6. 8 and 10% of cement. According to results of sieve analysis, Aggregate crushing value (ACV), flakiness index and California Bearing Ratio (CBR), 30% of Crushed Stone Aggregate (CSA) can be replaced by cinder gravels for use as Fresh, crushed rock (GB1) material and for cement treated cinder gravels adding 6% and 8% cement make them suitable for use as Stabilized base course (CB2) and (CB1) base course materials respectively, referring to their 14 day compressive strength as determined by Unified compressive strength test(UCS) test.

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Oluwasola, E. A., A. Afolayan, O. O. Ipindola, M. O. Popoola und A. O. Oginni. „Effect of Aggregate Shapes on the Properties of Concrete“. LAUTECH Journal of Civil and Environmental Studies 5, Nr. 1 (27.09.2020): 1–10. http://dx.doi.org/10.36108/laujoces/0202/50(0110).

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Aggregates constitute more than 90% of concrete and significantly determine the strength of concrete. In this study, the shape characteristics such as flakiness and elongation were determined using elongation and thickness gauge. The aggregate used for the study is granite. Aggregate crushing value and aggregate impact value tests were performed on the aggregate while slump test, water absorption test, compressive strength test and flexural strength test were carried out on concrete. A total of one hundred and thirty-two concrete cubes were produced using 1:2:4 and 1:3:6 mix each for the compressive strength test and forty-eight reinforced concrete beams were produced for flexural strength test. The slump for all the samples tested was examined to be true. The compressive strength of the concrete cube was greatly affected by the shape of aggregate used and it was noted that; for lower percentage of flaky and elongated aggregate the compressive strength is moderately high compared to when the percentage is high. The highest obtained compressive strength, 15N/mm2 is in compliance with the concrete compressive strength of normal 1:2:4 mix as stipulated in ASTM C109, Also, with 30% of elongated aggregate and 30% of flaky, the flexural strength of 7.03 N/mm2 was obtained. This shows that aggregate shape is a very important property of coarse aggregate that must be put into consideration in production of quality concrete for construction works.

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Alam, Muhammad, Javed Akhtar Qureshi, Garee Khan, Manzoor Ali und Shaheen Shah. „The Evaluation of Geotechnical Properties of Precambrian Hazara Slates, Hazara-Kashmir Syntaxis, Azad Kashmir, Pakistan“. International Journal of Economic and Environmental Geology 10, Nr. 2 (04.09.2019): 129–33. http://dx.doi.org/10.46660/ijeeg.vol10.iss2.2019.273.

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The fold and thrust belt of the eastern Hazara division characterised the sedimentary rocks of Precambrian toPaleocene age. The sequence and formation of Precambrian signify the oldest rock unit as Hazara Slate. Geologicalmap of the study area was prepared at the scale of 1:75,000 for about 140 square kilometre area located inMuzaffarabad (Azad Kashmir) district and Lohargali of Abbottabad (Khyber Pakhtunkhwa) district. The lab analysisshows that it is not rational to use Hazara slates as aggregate material due to its mineral accumulation and composition.Los Angele’s Abrasion Value, Impact Value, Crushing Value, Specific Gravity, Water Absorption, Flakiness Index,Elongation Index, Porosity Value, California Bearing Ratio test and Grain Size Analysis were done and co-related withB.S standards and the parameters were deduced. It was observed that the mineral composition of Hazara Slates rangesfor illite, kaolinite, quartz and carbonate. Kaolinite and illite are clay minerals which haveswelling potential to causeconstruction material damage the material. The presence of Carbonate and Quartz gives strength to the material, but itspercentage is low. Reserves calculation of different localities was also done for the quarry development.

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Ziao, J., und J. Tao. „Investigation of Interlaminar Defects and their Influence on Interlaminar Strength“. Advanced Composites Letters 5, Nr. 4 (Juli 1996): 096369359600500. http://dx.doi.org/10.1177/096369359600500404.

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In this paper, we directed our attention to the interlaminar defects and their influence on the interlaminar strengths. With the aid of a S-570 scanning electron microscope, the morphology and distribution of interlaminar defects were inspected and documented. According to their shape, size and cause of formation, the defects were classified into five types: flakiness void, irregular shaped debond, local imperfectly cured resin, debond in two multi-directional plies, and inhomogeneous fibers and the large scale debond by these fibers. The cause of defects formation was discussed by analyzing the manufacturing process of composites. The influence of defects on the interlaminar strength and its mechanism was analyzed experimentally and theoretically. The results indicate that these defects, with different effects, decrease the interlaminar strength because they form interlaminar cracks, and the interlaminar shear strength is less affected than interlaminar tensile strength, which is measured according to GB4944 test method. To comprehend defects distribution effect, a four-point-bending test method was introduced to measure the interlaminar peel strength, and a discussion was made on the correlation between the interlaminar tensile strength, interlaminar peel strength and in-plane transverse tensile strength. Finally the concept of interlaminar defect coefficient, which can be used to characterize the defects, was set up and the formula to calculate it was proposed.

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Dissertationen zum Thema "Test flakiness"

Mjörnman, Jesper, und Daniel Mastell. „Randomness as a Cause of Test Flakiness“. Thesis, Linköpings universitet, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-177303.

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With today’s focus on Continuous Integration, test cases are used to ensure the software’s reliability when integrating and developing code. Test cases that behave in an undeterministic manner are known as flaky tests, which threatens the software’s reliability. Because of flaky test’s undeterministic nature, they can be troublesome to detect and correct. This is causing companies to spend great amount of resources on flaky tests since they can reduce the quality of their products and services. The aim of this thesis was to develop a usable tool that can automatically detect flakiness in the Randomness category. This was done by initially locating and rerunning flaky tests found in public Git repositories. By scanning the resulting pytest logs from the tests that manifested flaky behaviour, noting indicators of how flakiness manifests in the Randomness category. From these findings we determined tracing to be a viable option of detecting Randomness as a cause of flakiness. The findings were implemented into our proposed tool FlakyReporter, which reruns flaky tests to determine if they pertain to the Randomness category. Our FlakyReporter tool was found to accurately categorise flaky tests into the Randomness category when tested against 25 different flaky tests. This indicates the viability of utilizing tracing as a method of categorizing flakiness.

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Sjöbom, Anders. „Studying Test Flakiness in Python Projects : Original Findings for Machine Learning“. Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264459.

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Flaky tests can fail or pass without any changes to the code under test. They can destroy developers trust in a test suite and if ignored lead to bugs in released code. This thesis performs an empirical study of the most popular open source Python projects on GitHub. 197 commits with keywords indicating test flakiness are manually inspected and categorized according to the root cause of their flakiness. The results are compared to previous studies of Java projects. Two completely novel flakiness causes are found - precision and training (of a machine learning network). These two causes are almost entirely domain-specific to machine learning projects. Precision flakiness comes from an assertion with a too high or too low threshold. Training flakiness is caused by a faulty training setup of a machine learning network in a test. Most tests in Python projects are found to be flaky due to problems with asynchronous waiting, precision and network.
Odeterministiska tester kan ge ett godkänt eller misslyckat resultat utan att koden som testas har förändrats. De kan förstöra utvecklares tillit till en testsamling och leda till buggar i produktionskod om de ignoreras. En empirisk studie av de mest populära Pythonprojekten med öppen källkod på GitHub genomförs. 197 commits med meddelanden som indikerar odeterminism inspekteras manuellt och kategoriseras enligt orsak till odeterminism. Resultaten jämförs med tidigare studier som fokuserat på Javaprojekt. Två nya och originella orsaker hittas - precision och träning (av ett maskininlärningsnätverk). De här två orsakerna är nästan helt domänspecifika till maskininlärningsprojekt. Odeterminism på grund av precision beror på att ett testkrav (eng. assertion) hade en för hög eller för låg tröskel, som var omöjlig att nå varje gång testet utfördes. Odeterminism på grund av träning beror på att uppsättningen av träningen för ett maskininlärningsnätverk gjorts på ett felaktigt sätt. De vanligaste orsakerna till odeterminism i Pythontester identifieras som asynkron väntan (eng. asynchronous waiting), precision och nätverk.

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Kanneganti, Joshika, und Krithi Sameera Vadrevu. „Eliminating effects of Flakiness in Embedded Software Testing : An industrial case study“. Thesis, Blekinge Tekniska Högskola, Institutionen för programvaruteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-19391.

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Background. Unstable and unpredictable tests, herein referred to as flaky tests, pose a serious challenge to systems in the production environment. If a device is not tested thoroughly, it will be sent back for retesting from the production centers, which is an expensive affair. Removing flaky tests involves detecting the flaky tests, finding the causes of flakiness and finally the elimination of flakiness. The existing literature provides information on causes and elimination techniques of flakiness for software systems. All of these are studied thoroughly, and support is taken from interviews to understand they are applicable in the context of embedded systems. Objectives. The primary objective is to identify causes of flakiness in a device under test and also techniques for eliminating flakiness. Methods. In this paper, we applied a literature review to find the current state-of-art of flakiness. A case study is selected to address the objectives of the study. Interviews and observations carried out to collect data. Data analysis performed using a directed content analysis method. Results. Observations resulted in eliminating 4 causes of flakiness in embedded systems. Interview results in finding 4 elimination techniques which were not found in the literature. Conclusions. Causes and Elimination techniques for the domain of embedded systems are identified. Knowledge translation between the domains was carried out effectively.

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Alqarni, Ali Saeed. „Quantifying the characteristics of fine aggregate using direct and indirect test methods“. Thesis, 2013. http://hdl.handle.net/2152/23598.

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The characteristics of fine aggregates, such as shape, angularity, and surface texture, have been shown to influence the performance of concrete and asphalt mixtures and to play an important role in obtaining valuable properties of early age concrete such as workability, and compatibility. However, the measurement of fine aggregate characteristics is not easy. In the present study, 26 fine aggregates, covering a wide spectrum of mineralogy, were examined using direct and indirect test methods in order to evaluate the shape, angularity, and surface texture, as well as to analyze the gradation. The direct test methods, such as AIMS and Camsizer, which provide a digital image of the aggregates proved to be the best. However, the cost of such systems can limit the use of digital imagining systems in practice. The indirect test methods which provide an estimate of aggregate surface characteristics, such as uncompacted void test, mortar flow test, compressive strength test, and flakiness test gave variable results. The uncompacted void test (Method A) was shown to be the most accurate indirect test method. The Camsizer and the sieve analysis test produced identical gradation analysis results when an adequate sample was used. General correlations were developed between the direct and indirect test methods. The non-approved fine aggregates on the TxDOT’s list were analyzed and compared to those of the approved fine aggregates to see whether they could be successfully used. It was found that both LS-5 and LS-8 had good results—even better than the results of some of the approved fine aggregates. Thus, they could be successfully used.
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Buchteile zum Thema "Test flakiness"

Barboni, Morena, Antonia Bertolino und Guglielmo De Angelis. „What We Talk About When We Talk About Software Test Flakiness“. In Communications in Computer and Information Science, 29–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85347-1_3.

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Olianas, Dario, Maurizio Leotta, Filippo Ricca und Luca Villa. „Reducing Flakiness in End-to-End Test Suites: An Experience Report“. In Communications in Computer and Information Science, 3–17. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85347-1_1.

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Paydar, Samad, und Aidin Azamnouri. „An Experimental Study on Flakiness and Fragility of Randoop Regression Test Suites“. In Fundamentals of Software Engineering, 111–26. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31517-7_8.

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Girol, Guillaume, Benjamin Farinier und Sébastien Bardin. „Not All Bugs Are Created Equal, But Robust Reachability Can Tell the Difference“. In Computer Aided Verification, 669–93. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81685-8_32.

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AbstractThis paper introduces a new property called robust reachability which refines the standard notion of reachability in order to take replicability into account. A bug is robustly reachable if a controlled input can make it so the bug is reached whatever the value of uncontrolled input. Robust reachability is better suited than standard reachability in many realistic situations related to security (e.g., criticality assessment or bug prioritization) or software engineering (e.g., replicable test suites and flakiness). We propose a formal treatment of the concept, and we revisit existing symbolic bug finding methods through this new lens. Remarkably, robust reachability allows differentiating bounded model checking from symbolic execution while they have the same deductive power in the standard case. Finally, we propose the first symbolic verifier dedicated to robust reachability: we use it for criticality assessment of 4 existing vulnerabilities, and compare it with standard symbolic execution.

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Konferenzberichte zum Thema "Test flakiness"

Malm, Jean, Adnan Causevic, Björn Lisper und Sigrid Eldh. „Automated Analysis of Flakiness-mitigating Delays“. In AST '20: IEEE/ACM 15nd International Conference on Automation of Software Test. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3387903.3389320.

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Pontillo, Valeria, Fabio Palomba und Filomena Ferrucci. „Toward static test flakiness prediction: a feasibility study“. In ESEC/FSE '21: 29th ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering. New York, NY, USA: ACM, 2021. http://dx.doi.org/10.1145/3472674.3473981.

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Vancsics, Bela, Tamas Gergely und Arpad Beszedes. „Simulating the Effect of Test Flakiness on Fault Localization Effectiveness“. In 2020 IEEE Workshop on Validation, Analysis and Evolution of Software Tests (VST). IEEE, 2020. http://dx.doi.org/10.1109/vst50071.2020.9051636.

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Presler-Marshall, Kai, Eric Horton, Sarah Heckman und Kathryn Stolee. „Wait, Wait. No, Tell Me. Analyzing Selenium Configuration Effects on Test Flakiness“. In 2019 IEEE/ACM 14th International Workshop on Automation of Software Test (AST). IEEE, 2019. http://dx.doi.org/10.1109/ast.2019.000-1.

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Mishra, Debakanta, und S. M. Naziur Mahmud. „Effect of Particle Size and Shape Characteristics on Ballast Shear Strength: A Numerical Study Using the Direct Shear Test“. In 2017 Joint Rail Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/jrc2017-2322.

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The ballast layer serves as a major structural component in typical ballasted railroad track systems. When subjected to an external load, ballast particles present a complex mechanical response which is strongly dependent on particle to particle interactions within this discrete medium. One common test used to study the shear strength characteristics of railroad ballast is the Direct Shear Test (DST). However, it is often not feasible in standard geotechnical engineering laboratories to conduct direct shear tests on ballast particles due to significantly large specimen and test setup requirements. Even for the limited number of laboratories equipped to accommodate the testing of such large specimens, conducting repeated tests for parametric analysis of different test and specimen parameters on shear strength properties is often not feasible. Numerical modeling efforts are therefore commonly used for such parametric analyses. An ongoing research study at Boise State University is using the Discrete Element Method (DEM) to evaluate the effects of varying particle size and shape characteristics (i.e., flakiness, elongation, roundness, angularity) on direct shear strength behavior of railroad ballast. A commercially available three-dimensional DEM package (PFC3D®) is being used for this purpose. In numerical modeling, railroad ballasts can be simulated using spheres (simple approach) and non-breakable clumps (complex approach). This paper utilizes both approaches to compare the ballast stress-strain response as obtained from DST. Laboratory test results available in published literature are being used to calibrate the developed numerical models. This paper presents findings from this numerical modeling effort, and draws inferences concerning the implications of these findings on the design and construction of railroad ballast layers.

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Alshammari, Abdulrahman, Christopher Morris, Michael Hilton und Jonathan Bell. „FlakeFlagger: Predicting Flakiness Without Rerunning Tests“. In 2021 IEEE/ACM 43rd International Conference on Software Engineering: Companion Proceedings (ICSE-Companion). IEEE, 2021. http://dx.doi.org/10.1109/icse-companion52605.2021.00081.

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Alshammari, Abdulrahman, Christopher Morris, Michael Hilton und Jonathan Bell. „FlakeFlagger: Predicting Flakiness Without Rerunning Tests“. In 2021 IEEE/ACM 43rd International Conference on Software Engineering (ICSE). IEEE, 2021. http://dx.doi.org/10.1109/icse43902.2021.00140.

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